CN110672412A - Plate belt tension simulation device suitable for universal tensile testing machine - Google Patents

Plate belt tension simulation device suitable for universal tensile testing machine Download PDF

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CN110672412A
CN110672412A CN201910940212.0A CN201910940212A CN110672412A CN 110672412 A CN110672412 A CN 110672412A CN 201910940212 A CN201910940212 A CN 201910940212A CN 110672412 A CN110672412 A CN 110672412A
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strip
tension
rectangular
height
plate
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CN110672412B (en
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马晓宝
王涛
任忠凯
史汉卿
石瑛
黄庆学
张金柱
高翔宇
和东平
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Taiyuan University of Technology
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract

The invention belongs to the field of a plate and strip tension distribution simulation experiment, and particularly relates to a plate and strip tension simulation device suitable for a universal tensile testing machine. The angle steel is supported by the variable-height tension simulation bracket, the nonlinear load effect on the plate strip in the production process is simulated, the change of a stress field of the plate strip in the stretching process is detected, and the evolution law of the longitudinal stress distribution uneven change of the plate strip in the post-rolling bending process on the stress field is researched.

Description

Plate belt tension simulation device suitable for universal tensile testing machine
Technical Field
The invention belongs to the field of plate and strip tension distribution simulation experiments, and particularly relates to a plate and strip tension simulation device suitable for a universal tensile testing machine.
Background
The strip shape is essentially the distribution of residual stress in the strip, is an important index for evaluating the quality of the strip, and is an important difficult problem which troubles the control of the strip rolling process, especially an important factor influencing the yield of thin strip. The research on the distribution evolution law of the stress field in the plate and strip rolling process is of great importance.
At present, the plate shape research in the rolling process is mainly a simulation prediction method and a tension detection method. The simulation prediction mainly simulates the rolling process by a finite element method, an influence function method and the like, and because the rolling process is highly nonlinear and the tension and the rolling force are mutually coupled, a large amount of models are simplified, the prediction of the stress field and the longitudinal residual stress distribution of the strip and the strip is difficult to accurately realize, and particularly, the objective fact is difficult to accurately reflect by the rolling simulation calculation result of the thin strip and the ultrathin strip; the other method for simulation prediction is to carry out modeling research on the plate strip buckling process, the method realizes the influence degree of the plate strip stress load on the plate strip defects to a certain degree, and the plate strip buckling process is researched by giving boundary load, but the method has the advantages of simpler given boundary load form, complex calculation model and inaccurate calculation due to too many assumptions. The tension detection mainly comprises the step of actually measuring the residual stress distribution result of the rolled plate strip through a tension detection roller, the method can only detect the distribution result of a longitudinal stress field after rolling, cannot represent the mutual influence of the longitudinal stress, the shear stress and the transverse compressive stress, and cannot realize the research on the evolution rule and the cause of the stress field in the process of bending the plate strip.
Therefore, in order to research the influence rule of the complex evolution of the plate and strip stress field on the buckling of the plate and strip and explore the influence rule of the uneven longitudinal tensile stress on the plate and strip stress field, a set of experimental device for simulating the variable stress field needs to be developed.
Disclosure of Invention
The invention provides a plate belt tension simulation device suitable for a universal tensile testing machine aiming at the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a plate strip tension simulation device suitable for a universal tensile testing machine comprises two tensile frames which are symmetrically arranged up and down, each tensile frame comprises a tensile frame main body, a clamping end is fixedly arranged in the middle of the upper surface of each tensile frame main body, a middle groove for clamping a plate strip is arranged in the middle of the lower surface of each tensile frame main body, side grooves for placing tension simulation supports are symmetrically arranged on the left side and the right side of the middle groove, the two side grooves are communicated with the middle groove to form an inverted 'mountain' type groove, the tension simulation supports are arranged in the side grooves, the left side and the right side of each tensile frame main body and the tension simulation supports are provided with the same pin holes, pin shafts are arranged in the pin holes to fix the tension simulation supports, angle steels are symmetrically arranged on the front side and the back side of the upper end and the lower end of each plate strip respectively, and one side of each, the other side frame is arranged on the tension simulation bracket, and the upper end and the lower end of the plate strip are respectively clamped in the two stretching frame main bodies.
Further, the width l of the stretching clamping end headjw40-50 mm in height ljh50-60 mm in length ljl60-80 mm, rib plates are fixedly arranged on two sides of the clamping end respectively, the lower ends of the rib plates are fixedly connected with the stretching frame main body, and the thickness l of each rib plate isswIs 7-10 mm.
Further, the width l of the main body of the stretching framedwIs 100 to 150mm in length,height ldh150-200 mm, length ldlEqual to the length b of the plate stripsSide wall thickness l of the main body of the stretching framegt25mm, side groove width lgw15-20 mm in height lgh100-120 mm, and a middle groove width lowEqual to 14 mm.
Furthermore, the tension simulation support is composed of a plurality of rectangular strips meeting the fixed height relation, and the tension simulation supports at the upper end and the lower end of the plate strip respectively adopt rectangular strips with variable heights and rectangular strips with equal heights for 1.5hbRectangular strip of (2), rectangular strip thickness trIs 0.7 times the width of the side groove, i.e. tr＝0.7lgwHeight h of each rectangular bar in the variable-height tension simulation supportriFrom a basic height hbAnd a tension-influencing height hiComposition of hri＝hb+hiBasic height hb＝0.4lgh。
Further, the tension affects the height hiI.e. h (y) satisfies the following relationship:
where f (y) is a function of the longitudinal stress distribution of the basic mode of flatness of the strip, hbSimulating the basic height, t, of a rectangular bar of the support in tensionrSimulating the thickness of the rectangular strip of the stent for tension, EsModulus of elasticity of the strip, ErSimulating the modulus of elasticity of rectangular strips of the stent for tension,/0The height of the plate strip; in the experimental process, the rectangular strip in the tension simulation bracket bears the pressure effect, the plate belt bears the tension effect, and the elastic moduli of the rectangular strip and the plate belt material of the tension simulation bracket are respectively ErAnd EsAnd from the longest rectangular strip stress to the shortest rectangular strip contact angle steel surface stress, the rectangular strips and the plate belt are elastically deformed. Assuming that the rectangular strips are subjected to uniform compressive stress in the process, the corresponding position of the strip generates uniform tensile strain along the longitudinal direction, and the amount of the compressive strain of the rectangular strips is epsilonr(y) the corresponding longitudinal tensile strain of the strip is epsilons(y) the longitudinal stress of the strip and strip can be balancedObtaining:
Erεr(y)＝Esεs(y) 1-2
in the experimental process, two stretching frames which are vertically symmetrical stretch towards two directions respectively, angle steel is firstly contacted with the highest rectangular strip in the tension simulation support, along with stretching, the angle steel strip element supported by the high rectangular strip deforms and extends, the corresponding high rectangular strip is stressed by the pressure of the effect of the angle steel, along with the increase of the pressure, the height of the high rectangular strip is compressed, and when the angle steel is contacted with the lowest rectangular strip, namely, when the angle steel is just contacted but does not deform, the displacement s of the stretching frames and the initial length l of the plate strip are determined according to the displacement s of the stretching frames and the0The minimum height h of the rectangular strip of the tension simulation bracketbThe tension-simulating support has an influence on the height h (y) hiStrain epsilonr(y) and strip strain εsThe geometrical relationship of (y) can be found in the following relationship:
Figure BDA0002222626970000032
can be obtained by finishing
l0εs(y)＝h(y)-2[h(y)+hb]εr(y) 1-4
The united vertical type (1-2) and the united vertical type (1-4) form an equation set, and after the deformation is obtained through solution, the strain of any one tension simulation support rectangular strip is as follows:
according to the one-way compression constitutive relation of the rectangular strips in the height direction, the stress borne by any one tension simulation support rectangular strip is calculated as follows:
σr＝Erεr(y) 1-6
arranging a longitudinal stress field with variable height rectangular strip structure change along the width direction of the strip, taking the longitudinal stress field under a typical flatness mode as a structural target, adopting a first class orthogonal polynomial form of Chebyshev as a flatness basic mode, and giving a simulated longitudinal unit width tension load according to the Chebyshev basic flatness mode, wherein the formula (1) is shown in-7). 1-4 times Chebyshev orthogonal polynomial (N) after coordinate normalization processingcr＝1)。
Figure BDA0002222626970000042
NcrIs the critical load of the plate strip in buckling, is the load of the unit width line, bsIs the width of the plate strip, and y is a one-dimensional coordinate of the plate strip 6 in the width direction.
Assuming that the load borne by the tension simulation bracket is equal to the uniform distribution pressure of the line load at the width center of the tension simulation bracket lath along the thickness direction, the stress borne by the rectangular strip of the tension simulation bracket is calculated according to the uniform distribution line load and is as follows:
according to the relationships of the formulas (1-5), (1-6) and (1-8):
Figure BDA0002222626970000052
furthermore, the angle steel is 90-degree angle steel, and the length of the angle steel is equal to the length b of the plate beltsThe same, the angle steel contacted with the rectangular strips with the same height is of an integral structure, and the angle steel contacted with the rectangular strips with the variable height is cut into the number and the width b of the rectangular strips in the tension simulation bracketriA plurality of bars each corresponding to each other, the width of the bars being denoted by bsi. The angle steel on the side with the same height can be used as a whole to enhance the strength of the angle steel, and the angle steel on the side with the higher height is cut to meet the requirements of detection of rectangular strips with different heights.
Further, the diameter of the pin hole is phixIs a rectangular strip width bri0.3-0.5 times of the diameter phi of the pin shaftxzDiameter phi of pin holexLittle 2 ~ 6mm, the length of round pin axle is the poor half of tensile frame main part width and middle part groove width, promptly: lxz＝0.5(ldw-low)。
Furthermore, the pin shafts positioned on the same side of the stretching frame main body are connected into a whole through the mounting plate, the mounting plate is connected with the stretching frame main body through screws, the pin shafts positioned on the same side are connected into a whole through the mounting plate, synchronous installation can be carried out, and the assembly time is saved.
Furthermore, the height of the partition board between the middle groove and the side groove is lower than that of the lowest rectangular strip in the tension simulation bracket.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, through research, a given plate and strip flatness basic mode and a longitudinal unit width tension load are calculated to obtain a tension simulation support rectangular strip influence height function, and various nonlinear loads can be simulated in a laboratory by combining the provided experimental device suitable for a universal tensile testing machine to carry out related experiments;
2. the angle steel can be supported by the variable-height tension simulation bracket, so that the nonlinear load effect on the plate strip in the production and use processes is simulated, the change of a stress field of the plate strip in the stretching process is detected, and the evolution rule of the longitudinal stress distribution uneven change of the plate strip in the post-rolling bending process on the stress field is researched;
3. the invention can change the shape of the tension simulation bracket by changing the height of the rectangular strip, realizes the simulation of different longitudinal stress fields, and has simple and reasonable structure and convenient and fast replacement;
4. the invention adopts the mounting plate to connect the pin shafts on the same side of the stretching frame main body into a whole, can synchronously fix the rectangular strips on the same side, saves the assembly time and improves the experimental efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is an enlarged view of a portion of circle A of FIG. 2 in accordance with the present invention;
FIG. 4 is a right side view of the main body of the stretcher of the present invention;
FIG. 5 is a right side view of the main body of the stretcher of the present invention;
FIG. 6 is a front view of the main body of the stretcher of the present invention;
FIG. 7 is a schematic connection diagram of a plate belt and angle steel;
FIG. 8 is a schematic diagram of a tension simulation frame of the present invention comprising rectangular bars of equal height;
FIG. 9 is a schematic structural view of a tension simulating mount according to the invention in a billows mode;
FIG. 10 is a schematic view of the tension simulation brace of the wave mode of the present invention;
FIG. 11 is a schematic view of a quarter wave mode tension simulating mount according to the invention;
FIG. 12 is a schematic view showing the deformation and geometric relationship of the plate strip along with the displacement of the stretching frame;
FIG. 13 is a schematic diagram of the tension load modes of the wedge mode, the edge or midswing mode, the single rib wave mode, and the quarter wave mode of the present invention in the form of Chebyshev orthogonal polynomials as the base mode of flatness;
FIG. 14 is a schematic view showing a tension load mode in which a wedge shape is a basic mode in example 1 of the present invention;
FIG. 15 is a schematic diagram showing a tension load mode in a fundamental mode of a middle wave in example 2 of the present invention;
FIG. 16 is a schematic diagram of a tension load mode using a wave as a basic mode in embodiment 3 of the present invention;
FIG. 17 is a schematic diagram of the tension load mode with a quarter wave as the basic mode in embodiment 4 of the present invention;
the tension simulation device comprises a clamping end-2, a ribbed plate-3, a stretching frame main body-4, angle steel-5, a plate belt-6, a tension simulation support-7, a pin shaft-8, a stretching frame-9, a mounting plate-10, a partition plate-11, a middle groove-12 and a side groove-13.
Detailed Description
In order to further illustrate the technical solution of the present invention, the present invention is further illustrated by the following examples.
Example 1
As shown in fig. 1 to 12, a universal tensile testing machineThe plate belt tension simulation device comprises two stretching frames 9 which are arranged in an up-and-down symmetrical mode, wherein each stretching frame 9 comprises a stretching frame main body 4, a clamping end head 2 is fixedly arranged in the middle of the upper surface of each stretching frame main body 4, and the width l of each clamping end head 2 is extendedjwIs 40mm, height ljh60mm, length ljl60mm, rib plates 3 are respectively and fixedly arranged on two sides of the clamping end head 2, the lower ends of the rib plates 3 are fixedly connected with the stretching frame main body 4, and the thickness l of the rib plates 3swIs 7 mm. The middle part of the lower surface of the stretching frame body 4 is provided with a middle groove 12 used for clamping the plate strip 6, the left side and the right side of the middle groove 12 are symmetrically provided with side grooves 13 used for placing the tension simulation support 7, the two side grooves 13 are communicated with the middle groove 12 to form an inverted 'mountain' -shaped groove, and the height of the partition plate 11 between the middle groove 12 and the side grooves 13 is lower than that of the lowest rectangular strip in the tension simulation support 7. Width l of stretching frame body 4dwIs 150mm, height ldhIs 150mm, length ldlEqual to the length b of the plate stripsThickness of side wall of main body 4 of stretchergt25mm, side channel 13 width lgwIs 15mm, height lgh100mm, a width l of the middle groove 12owEqual to 14 mm. The tension simulation support 7 is arranged in the side groove 13, the tension simulation support 7 is composed of a plurality of rectangular strips meeting the fixed height relation, and the tension simulation supports 7 at the upper end and the lower end of the plate strip 6 respectively adopt rectangular strips with variable heights and rectangular strips with equal heights for 1.5hbRectangular strip of (2), rectangular strip thickness trIs 0.7 times the width of the side groove 13, i.e. tr＝0.7lgwHeight h of each rectangular bar in the high-tension simulation support 7riFrom a basic height hbAnd a tension-influencing height hiIs formed ofri＝hb+hiBasic height hb＝0.4lgh. The left side and the right side of the stretching frame main body 4 are provided with the same pin holes as the tension simulation brackets 7, pin shafts are arranged in the pin holes to fix the tension simulation brackets 7, and the diameter phi of the pin holesxFor simulating the width b of a rectangular strip in a support under tensionri0.3 times of the diameter phi of the pin shaft 8xzDiameter phi of pin holex2mm small, pin shaftThe length of 8 is 0.5 times of the difference between the width of the stretching frame body 4 and the width of the middle groove 12, namely: lxz＝0.5(ldw-low). The pin shafts 8 positioned on the same side of the stretching frame main body 4 are connected into a whole through the mounting plate 10, and the mounting plate 10 is connected with the stretching frame main body 4 through screws. Angle steel 5 is symmetrically arranged on the front side and the rear side of the upper end and the lower end of the plate strip 6 respectively, one side of the angle steel 5 is fixedly connected with the plate strip 6, the other side of the angle steel 5 is arranged on a tension simulation bracket 7, the angle steel 5 is 90-degree angle steel, and the length of the angle steel 5 is equal to the length b of the plate strip 6sThe same, the angle steel 5 contacted with the rectangular strips with the same height is of an integral structure, and the angle steel 5 contacted with the rectangular strips with the variable height is uniformly cut into the number and the width b of the rectangular strips in the tension simulation bracket 7riA plurality of bars each corresponding to each other, the width of the bars being denoted by bsi. The upper end and the lower end of the plate belt 6 are respectively clamped in the two stretching frame main bodies 4.
The tension-influencing height hiI.e. h (y) satisfies the following relationship:
Figure BDA0002222626970000091
where f (y) is a function of the longitudinal stress distribution of the basic mode of flatness of the strip, hbSimulating the basic height, t, of a rectangular bar of the support in tensionrSimulating the thickness of the rectangular strip of the stent for tension, EsModulus of elasticity of the strip, ErSimulating the modulus of elasticity of rectangular strips of the stent for tension,/0The height of the plate belt 6; in the experimental process, the rectangular strip in the tension simulation bracket 7 bears the pressure effect, the plate strip 6 bears the tension effect, and the elastic moduli of the rectangular strip of the tension simulation bracket 7 and the plate strip material are respectively ErAnd EsAnd from the longest rectangular strip stress to the shortest rectangular strip stress on the 5 surfaces of the contact angle steel, the rectangular strips and the plate belt 6 are elastically deformed. Assuming that the rectangular strip bears uniform compressive stress in the process, the plate strip 6 at the corresponding position generates uniform tensile strain along the longitudinal direction, and the compressive strain amount of the rectangular strip is epsilonr(y) the corresponding longitudinal tensile strain of the plate strip 6 is epsilons(y) rectangular bars andthe longitudinal stress balance of the plate strip 6 can be obtained:
Erεr(y)＝Esεs(y) 1-2
in the experimental process, two stretching frames 9 which are vertically symmetrical stretch towards two directions respectively, the angle steel 5 is firstly contacted with the highest rectangular strip in the tension simulation bracket 7, along with the stretching, the 5 elements of the angle steel supported by the high rectangular strip deform and extend, the pressure acted by the angle steel 5 is applied to the corresponding high rectangular strip, along with the increase of the pressure, the height of the high rectangular strip is compressed, when the angle steel 5 is contacted with the lowest rectangular strip, namely, when the angle steel is just contacted but does not deform, as shown in figure 12, the initial length l of the plate strip is changed according to the displacement s of the stretching frames 9, and the initial length l of the plate0The minimum height h of the rectangular strip of the tension simulation bracketbThe tension-simulating support has an influence on the height h (y) hiStrain epsilonr(y) and strip strain εsThe geometrical relationship of (y) can be found in the following relationship:
Figure BDA0002222626970000092
can be obtained by finishing
l0εs(y)＝h(y)-2[h(y)+hb]εr(y) 1-4
The united vertical type (1-2) and the united vertical type (1-4) form an equation set, and after the deformation is obtained by solving, the change strain of any tension simulation support rectangular strip is as follows:
Figure BDA0002222626970000101
according to the one-way compression constitutive relation of the rectangular strips in the height direction, the stress borne by any one tension simulation support rectangular strip is calculated as follows:
σr＝Erεr(y) 1-6
arranging a longitudinal stress field with variable height rectangular strip structure change along the width direction of the strip, taking the longitudinal stress field in a wedge-shaped flatness mode as a structural target, adopting a Chebyshev first-class orthogonal polynomial form as a flatness basic mode, and simulating the tension load of the longitudinal unit widthGiven a wedge-shaped residual stress distribution, the distribution is shown in FIG. 14, (N)cr＝120)。
Figure BDA0002222626970000102
NcrIs the critical load of the plate strip in buckling, is the load of the unit width line, bsIs the width of the plate strip, y is a one-dimensional coordinate in the width direction of the plate strip 6, and the origin of the coordinate axis is the midpoint in the width direction of the plate strip 6.
Assuming that the load borne by the tension simulation bracket is equal to the uniform pressure of the line load at the center of the width of the tension simulation bracket lath along the thickness direction, and calculating the stress borne by the rectangular strip of the tension simulation bracket according to the uniform line load:
Figure BDA0002222626970000103
according to the relationships of the formulas (1-5), (1-6) and (1-8):
Figure BDA0002222626970000111
example 2
As shown in fig. 1 to 12, the plate strip tension simulation device suitable for the universal tensile testing machine comprises two stretching frames 9 which are arranged in an up-and-down symmetrical mode, wherein each stretching frame 9 comprises a stretching frame main body 4, a clamping end head 2 is fixedly arranged in the middle of the upper surface of each stretching frame main body 4, and the width l of each clamping end head 2 is widejwIs 45mm, height ljhIs 55mm and has a length ljlIs 70mm, the two sides of the clamping end 2 are respectively and fixedly provided with a ribbed plate 3, the lower end of the ribbed plate 3 is fixedly connected with the stretching frame main body 4, and the thickness l of the ribbed plate 3swIs 8 mm. A middle groove 12 for clamping the plate strip 6 is arranged in the middle of the lower surface of the stretching frame body 4, side grooves 13 for placing the tension simulation supports 7 are symmetrically arranged on the left side and the right side of the middle groove 12, the two side grooves 13 are communicated with the middle groove 12 to form an inverted 'mountain' -shaped groove, and the middle groove 12 are communicated with each otherThe height of the spacer 11 between the side slots 13 is lower than the height of the lowest rectangular strip in the tension simulation bracket 7. Width l of stretching frame body 4dw130mm, height ldh170mm, length ldlEqual to the length b of the plate stripsThickness of side wall of main body 4 of stretchergt25mm, side channel 13 width lgwIs 18mm, height lghIs 110mm, and the width l of the middle groove 12owEqual to 14 mm. The tension simulation support 7 is arranged in the side groove 13, the tension simulation support 7 is composed of a plurality of rectangular strips meeting the fixed height relation, and the tension simulation supports 7 at the upper end and the lower end of the plate strip 6 respectively adopt rectangular strips with variable heights and rectangular strips with equal heights for 1.5hbRectangular strip of (2), rectangular strip thickness trIs 0.7 times the width of the side groove 13, i.e. tr＝0.7lgwHeight h of each rectangular bar in the high-tension simulation support 7riFrom a basic height hbAnd a tension-influencing height hiComposition of hri＝hb+hiBasic height hb＝0.4lgh. The left side and the right side of the stretching frame main body 4 are provided with the same pin holes as the tension simulation brackets 7, pin shafts are arranged in the pin holes to fix the tension simulation brackets 7, and the diameter phi of the pin holesxFor simulating the width b of a rectangular strip in a support by tensionri0.4 times of the diameter phi of the pin shaft 8xzDiameter phi of pin holexLittle 4mm, the length of round pin axle 8 is the tensile frame main part 4 width and middle part 12 width difference 0.5 times, promptly: lxz＝0.5(ldw-low). The pin shafts 8 positioned on the same side of the stretching frame main body 4 are connected into a whole through the mounting plate 10, and the mounting plate 10 is connected with the stretching frame main body 4 through screws. Angle steel 5 is symmetrically arranged on the front side and the rear side of the upper end and the lower end of the plate strip 6 respectively, one side of the angle steel 5 is fixedly connected with the plate strip 6, the other side of the angle steel 5 is arranged on a tension simulation bracket 7, the angle steel 5 is 90-degree angle steel, and the length of the angle steel 5 is equal to the length b of the plate strip 6sThe same, the angle steel 5 contacted with the rectangular strips with the same height is of an integral structure, and the angle steel 5 contacted with the rectangular strips with the variable height is uniformly cut into the number and the width b of the rectangular strips in the tension simulation bracket 7riAre all mutuallyA corresponding plurality of bar elements, the width of the bar elements being denoted bsi. The upper end and the lower end of the plate belt 6 are respectively clamped in the two stretching frame main bodies 4.
The tension-influencing height hiI.e. h (y) satisfies the following relationship:
Figure BDA0002222626970000121
where f (y) is a function of the longitudinal stress distribution of the basic mode of flatness of the strip, hbSimulating the basic height, t, of a rectangular bar of the support in tensionrSimulating the thickness of the rectangular strip of the stent for tension, EsModulus of elasticity of the strip, ErSimulating the modulus of elasticity of rectangular strips of the stent for tension,/0The height of the plate belt 6; in the experimental process, the rectangular strip in the tension simulation bracket 7 bears the pressure effect, the plate strip 6 bears the tension effect, and the elastic moduli of the rectangular strip of the tension simulation bracket 7 and the plate strip material are respectively ErAnd EsAnd from the longest rectangular strip stress to the shortest rectangular strip stress on the 5 surfaces of the contact angle steel, the rectangular strips and the plate belt 6 are elastically deformed. Assuming that the rectangular strip bears uniform compressive stress in the process, the plate strip 6 at the corresponding position generates uniform tensile strain along the longitudinal direction, and the compressive strain amount of the rectangular strip is epsilonr(y) the corresponding longitudinal tensile strain of the plate strip 6 is epsilons(y), the rectangular bars and strip 6 longitudinal stress balance can be obtained:
Erεr(y)＝Esεs(y) 1-2
in the experimental process, two stretching frames 9 which are vertically symmetrical stretch towards two directions respectively, the angle steel 5 is firstly contacted with the highest rectangular strip in the tension simulation bracket 7, along with the stretching, the 5 elements of the angle steel supported by the high rectangular strip deform and extend, the pressure acted by the angle steel 5 is applied to the corresponding high rectangular strip, along with the increase of the pressure, the height of the high rectangular strip is compressed, when the angle steel 5 is contacted with the lowest rectangular strip, namely, when the angle steel is just contacted but does not deform, as shown in figure 12, the initial length l of the plate strip is changed according to the displacement s of the stretching frames 9, and the initial length l of the plate0The minimum height h of the rectangular strip of the tension simulation bracketbThe tension-simulating support has an influence on the height h (y) hiShould, shouldBecome epsilonr(y) and strip strain εsThe geometrical relationship of (y) can be found in the following relationship:
Figure BDA0002222626970000131
can be obtained by finishing
l0εs(y)＝h(y)-2[h(y)+hb]εr(y) 1-4
The united vertical type (1-2) and the united vertical type (1-4) form an equation set, and after the deformation is obtained by solving, the strain of any tension simulation support rectangular strip is as follows:
Figure BDA0002222626970000132
according to the one-way compression constitutive relation of the rectangular strips in the height direction, the stress borne by any one tension simulation support rectangular strip is calculated as follows:
σr＝Erεr(y) 1-6
arranging a longitudinal stress field with variable height rectangular strip structure change along the width direction of the strip, taking the longitudinal stress field in a Zhonglang flatness mode as a structural target, adopting a Chebyshev first-class orthogonal polynomial form as a flatness basic mode, giving a simulated longitudinal unit width tension load according to the Zhonglang residual stress distribution, wherein the distribution is shown in figure 15, (N)cr＝120)。
Figure BDA0002222626970000133
NcrIs the critical load of the plate strip in buckling, is the load of the unit width line, bsIs the width of the plate strip, y is a one-dimensional coordinate in the width direction of the plate strip 6, and the origin of the coordinate axis is the midpoint in the width direction of the plate strip 6.
Assuming that the load borne by the tension simulation bracket is equal to the uniform pressure of the line load at the center of the width of the tension simulation bracket lath along the thickness direction, and calculating the stress borne by the rectangular strip of the tension simulation bracket according to the uniform line load:
Figure BDA0002222626970000141
according to the relationships of the formulas (1-5), (1-6) and (1-8):
Figure BDA0002222626970000142
example 3
As shown in fig. 1 to 12, the plate strip tension simulation device suitable for the universal tensile testing machine comprises two stretching frames 9 which are arranged in an up-and-down symmetrical mode, wherein each stretching frame 9 comprises a stretching frame main body 4, a clamping end head 2 is fixedly arranged in the middle of the upper surface of each stretching frame main body 4, and the width l of each clamping end head 2 is widejwIs 50mm, height ljhIs 50mm, length ljlIs 80mm, the two sides of the clamping end 2 are respectively and fixedly provided with a ribbed plate 3, the lower end of the ribbed plate 3 is fixedly connected with the stretching frame main body 4, and the thickness l of the ribbed plate 3swIs 10 mm. The middle part of the lower surface of the stretching frame body 4 is provided with a middle groove 12 used for clamping the plate strip 6, the left side and the right side of the middle groove 12 are symmetrically provided with side grooves 13 used for placing the tension simulation support 7, the two side grooves 13 are communicated with the middle groove 12 to form an inverted 'mountain' -shaped groove, and the height of the partition plate 11 between the middle groove 12 and the side grooves 13 is lower than that of the lowest rectangular strip in the tension simulation support 7. Width l of stretching frame body 4dwIs 100mm, height ldhIs 200mm, length ldlEqual to the length b of the plate stripsThickness of side wall of main body 4 of stretchergt25mm, side channel 13 width lgwIs 20mm, height lgh120mm, a width l of the middle groove 12owEqual to 14 mm. The tension simulation support 7 is arranged in the side groove 13, the tension simulation support 7 is composed of a plurality of rectangular strips meeting the fixed height relation, and the tension simulation supports 7 at the upper end and the lower end of the plate strip 6 respectively adopt rectangular strips with variable heights and rectangular strips with equal heights for 1.5hbRectangular strip of (2), rectangular strip thickness trIs 0.7 times the width of the side groove 13, i.e. tr＝0.7lgwHigh-degree tension dieHeight h of each rectangular bar in the pseudo-bracket 7riFrom a basic height hbAnd a tension-influencing height hiComposition of hri＝hb+hiBasic height hb＝0.4lgh. The left side and the right side of the stretching frame main body 4 are provided with the same pin holes as the tension simulation brackets 7, pin shafts are arranged in the pin holes to fix the tension simulation brackets 7, and the diameter phi of the pin holesxFor simulating the width b of a rectangular strip in a support by tensionri0.5 times of the diameter phi of the pin shaft 8xzDiameter phi of pin holexLittle 6mm, the length of round pin axle 8 is the tensile frame main part 4 width and middle part 12 width difference 0.5 times, promptly: lxz＝0.5(ldw-low). The pin shafts 8 positioned on the same side of the stretching frame main body 4 are connected into a whole through the mounting plate 10, and the mounting plate 10 is connected with the stretching frame main body 4 through screws. Angle steel 5 is symmetrically arranged on the front side and the rear side of the upper end and the lower end of the plate strip 6 respectively, one side of the angle steel 5 is fixedly connected with the plate strip 6, the other side of the angle steel 5 is arranged on a tension simulation bracket 7, the angle steel 5 is 90-degree angle steel, and the length of the angle steel 5 is equal to the length b of the plate strip 6sThe same, the angle steel 5 contacted with the rectangular strips with the same height is of an integral structure, and the angle steel 5 contacted with the rectangular strips with the variable height is uniformly cut into the number and the width b of the rectangular strips in the tension simulation bracket 7riA plurality of bars each corresponding to each other, the width of the bars being denoted by bsi. The upper end and the lower end of the plate belt 6 are respectively clamped in the two stretching frame main bodies 4.
The tension-influencing height hiI.e. h (y) satisfies the following relationship:
where f (y) is a function of the longitudinal stress distribution of the basic mode of flatness of the strip, hbSimulating the basic height, t, of a rectangular bar of the support in tensionrSimulating the thickness of the rectangular strip of the stent for tension, EsModulus of elasticity of the strip, ErSimulating the modulus of elasticity of rectangular strips of the stent for tension,/0The height of the plate belt 6; in thatIn the experimental process, the rectangular strip in the tension simulation bracket 7 bears the pressure effect, the plate strip 6 bears the tension effect, and the elastic moduli of the rectangular strip of the tension simulation bracket 7 and the plate strip material are respectively ErAnd EsAnd from the longest rectangular strip stress to the shortest rectangular strip stress on the 5 surfaces of the contact angle steel, the rectangular strips and the plate belt 6 are elastically deformed. Assuming that the rectangular strip bears uniform compressive stress in the process, the plate strip 6 at the corresponding position generates uniform tensile strain along the longitudinal direction, and the compressive strain amount of the rectangular strip is epsilonr(y) the corresponding longitudinal tensile strain of the plate strip 6 is epsilons(y), the rectangular bars and strip 6 longitudinal stress balance can be obtained:
Erεr(y)＝Esεs(y) 1-2
in the experimental process, two stretching frames 9 which are vertically symmetrical stretch towards two directions respectively, the angle steel 5 is firstly contacted with the highest rectangular strip in the tension simulation bracket 7, along with the stretching, the 5 elements of the angle steel supported by the high rectangular strip deform and extend, the pressure acted by the angle steel 5 is applied to the corresponding high rectangular strip, along with the increase of the pressure, the height of the high rectangular strip is compressed, when the angle steel 5 is contacted with the lowest rectangular strip, namely, when the angle steel is just contacted but does not deform, as shown in figure 12, the initial length l of the plate strip is changed according to the displacement s of the stretching frames 9, and the initial length l of the plate0The minimum height h of the rectangular strip of the tension simulation bracketbThe tension-simulating support has an influence on the height h (y) hiStrain epsilonr(y) and strip strain εsThe geometrical relationship of (y) can be found in the following relationship:
Figure BDA0002222626970000161
can be obtained by finishing
l0εs(y)＝h(y)-2[h(y)+hb]εr(y) 1-4
The united vertical type (1-2) and the united vertical type (1-4) form an equation set, and after the deformation is obtained through solution, the strain of any one tension simulation support rectangular strip is as follows:
Figure BDA0002222626970000162
according to the one-way compression constitutive relation of the rectangular strips in the height direction, the stress borne by any one tension simulation support rectangular strip is calculated as follows:
σr＝Erεr(y) 1-6
arranging a longitudinal stress field with variable height rectangular strip structure change along the width direction of the strip, taking the longitudinal stress field in a wave flatness mode as a structural target, adopting a Chebyshev first-class orthogonal polynomial form as a flatness basic mode, giving a simulated longitudinal unit width tension load according to the wave residual stress distribution, wherein the distribution is shown in figure 16, (N)cr＝120)。
Figure BDA0002222626970000171
NcrIs the critical load of the plate strip in buckling, is the load of the unit width line, bsIs the width of the plate strip, y is a one-dimensional coordinate in the width direction of the plate strip 6, and the origin of the coordinate axis is the midpoint in the width direction of the plate strip 6.
Assuming that the load borne by the tension simulation bracket is equal to the uniform pressure of the line load at the center of the width of the tension simulation bracket lath along the thickness direction, and calculating the stress borne by the rectangular strip of the tension simulation bracket according to the uniform line load:
according to the relationships of the formulas (1-5), (1-6) and (1-8):
Figure BDA0002222626970000173
example 4
As shown in fig. 1 to 12, a plate strip tension simulation device suitable for a universal tensile testing machine comprises two stretching frames 9 which are arranged in an up-and-down symmetrical manner, wherein each stretching frame 9 comprises a stretching frame main body 4, a clamping end 2 is fixedly arranged in the middle of the upper surface of each stretching frame main body 4, and the clamping end 2 is fixed on the middle of the upper surface of each stretching frame main body 4The width l of the stretching clamping end 2jwIs 50mm, height ljhIs 50mm, length ljlIs 80mm, the two sides of the clamping end 2 are respectively and fixedly provided with a ribbed plate 3, the lower end of the ribbed plate 3 is fixedly connected with the stretching frame main body 4, and the thickness l of the ribbed plate 3swIs 10 mm. The middle part of the lower surface of the stretching frame body 4 is provided with a middle groove 12 used for clamping the plate strip 6, the left side and the right side of the middle groove 12 are symmetrically provided with side grooves 13 used for placing the tension simulation support 7, the two side grooves 13 are communicated with the middle groove 12 to form an inverted 'mountain' -shaped groove, and the height of the partition plate 11 between the middle groove 12 and the side grooves 13 is lower than that of the lowest rectangular strip in the tension simulation support 7. Width l of stretching frame body 4dwIs 100mm, height ldhIs 200mm, length ldlEqual to the length b of the plate stripsThickness of side wall of main body 4 of stretchergt25mm, side channel 13 width lgwIs 20mm, height lgh120mm, a width l of the middle groove 12owEqual to 14 mm. The tension simulation support 7 is arranged in the side groove 13, the tension simulation support 7 is composed of a plurality of rectangular strips meeting the fixed height relation, and the tension simulation supports 7 at the upper end and the lower end of the plate strip 6 respectively adopt rectangular strips with variable heights and rectangular strips with equal heights for 1.5hbRectangular strip of (2), rectangular strip thickness trIs 0.7 times the width of the side groove 13, i.e. tr＝0.7lgwHeight h of each rectangular bar in the high-tension simulation support 7riFrom a basic height hbAnd a tension-influencing height hiComposition of hri＝hb+hiBasic height hb＝0.4lgh. The left side and the right side of the stretching frame main body 4 are provided with the same pin holes as the tension simulation brackets 7, pin shafts are arranged in the pin holes to fix the tension simulation brackets 7, and the diameter phi of the pin holesxFor simulating the width b of a rectangular strip in a support by tensionri0.5 times of the diameter phi of the pin shaft 8xzDiameter phi of pin holexLittle 6mm, the length of round pin axle 8 is the tensile frame main part 4 width and middle part 12 width difference 0.5 times, promptly: lxz＝0.5(ldw-low). The pin shaft 8 positioned on the same side of the stretching frame main body 4 is connected with the stretching frame main body through a mounting plate 10The mounting plate 10 is connected to the tension frame body 4 by screws. Angle steel 5 is symmetrically arranged on the front side and the rear side of the upper end and the lower end of the plate strip 6 respectively, one side of the angle steel 5 is fixedly connected with the plate strip 6, the other side of the angle steel 5 is arranged on a tension simulation bracket 7, the angle steel 5 is 90-degree angle steel, and the length of the angle steel 5 is equal to the length b of the plate strip 6sThe same, the angle steel 5 contacted with the rectangular strips with the same height is of an integral structure, and the angle steel 5 contacted with the rectangular strips with the variable height is uniformly cut into the number and the width b of the rectangular strips in the tension simulation bracket 7riA plurality of bars each corresponding to each other, the width of the bars being denoted by bsi. The upper end and the lower end of the plate belt 6 are respectively clamped in the two stretching frame main bodies 4.
The tension-influencing height hiI.e. h (y) satisfies the following relationship:
Figure BDA0002222626970000191
where f (y) is a function of the longitudinal stress distribution of the basic mode of flatness of the strip, hbSimulating the basic height, t, of a rectangular bar of the support in tensionrSimulating the thickness of the rectangular strip of the stent for tension, EsModulus of elasticity of the strip, ErSimulating the modulus of elasticity of rectangular strips of the stent for tension,/0The height of the plate belt 6; in the experimental process, the rectangular strip in the tension simulation bracket 7 bears the pressure effect, the plate strip 6 bears the tension effect, and the elastic moduli of the rectangular strip of the tension simulation bracket 7 and the plate strip material are respectively ErAnd EsAnd from the longest rectangular strip stress to the shortest rectangular strip stress on the 5 surfaces of the contact angle steel, the rectangular strips and the plate belt 6 are elastically deformed. Assuming that the rectangular strip bears uniform compressive stress in the process, the plate strip 6 at the corresponding position generates uniform tensile strain along the longitudinal direction, and the compressive strain amount of the rectangular strip is epsilonr(y) the corresponding longitudinal tensile strain of the plate strip 6 is epsilons(y), the rectangular bars and strip 6 longitudinal stress balance can be obtained:
Erεr(y)＝Esεs(y) 1-2
the upper part and the lower part are symmetrical in the experimental processThe two stretching frames 9 respectively stretch towards two directions, the angle steel 5 is firstly contacted with the highest rectangular strip in the tension simulation bracket 7, along with the stretching, the 5 strip elements of the angle steel supported by the high rectangular strip deform and extend, the pressure acted by the angle steel 5 is correspondingly applied to the high rectangular strip, along with the increase of the pressure, the height of the high rectangular strip is compressed, when the angle steel 5 is contacted with the lowest rectangular strip, namely, when the angle steel just contacts but does not deform, as shown in figure 12, the initial length l of the plate strip is the initial length l according to the displacement s of the stretching frames 90The minimum height h of the rectangular strip of the tension simulation bracketbThe tension-simulating support has an influence on the height h (y) hiStrain epsilonr(y) and strip strain εsThe geometrical relationship of (y) can be found in the following relationship:
Figure BDA0002222626970000201
can be obtained by finishing
l0εs(y)＝h(y)-2[h(y)+hb]εr(y) 1-4
The united vertical type (1-2) and the united vertical type (1-4) form an equation set, and after the deformation is obtained through solution, the strain of any one tension simulation support rectangular strip is as follows:
Figure BDA0002222626970000202
according to the one-way compression constitutive relation of the rectangular strips in the height direction, the stress borne by any one tension simulation support rectangular strip is calculated as follows:
σr＝Erεr(y) 1-6
arranging a longitudinal stress field with variable height rectangular strip structure change along the width direction of the strip, taking the longitudinal stress field in a quarter-wave flatness mode as a structural target, adopting a Chebyshev first-class orthogonal polynomial form as a flatness basic mode, giving a simulated longitudinal unit width tension load according to quarter-wave residual stress distribution, wherein the distribution is shown in figure 17, (N)cr＝120)。
Figure BDA0002222626970000203
NcrIs the critical load of the plate strip in buckling, is the load of the unit width line, bsIs the width of the plate strip, y is a one-dimensional coordinate in the width direction of the plate strip 6, and the origin of the coordinate axis is the midpoint in the width direction of the plate strip 6.
Assuming that the load borne by the tension simulation bracket is equal to the uniform distribution pressure of the line load at the width center of the tension simulation bracket lath along the thickness direction, the stress borne by the rectangular strip of the tension simulation bracket is calculated according to the uniform distribution line load and is as follows:
Figure BDA0002222626970000211
according to the relationships of the formulas (1-5), (1-6) and (1-8):
while there have been shown and described what are at present considered to be the essential features and advantages of the invention, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. The utility model provides a slab band tension analogue means suitable for universal tensile testing machine which characterized in that: the tension simulation device comprises two stretching frames (9) which are symmetrically arranged up and down, wherein each stretching frame (9) comprises a stretching frame main body (4), a clamping end head (2) is fixedly arranged in the middle of the upper surface of each stretching frame main body (4), a middle groove (12) for clamping a plate strip (6) is arranged in the middle of the lower surface of each stretching frame main body (4), side grooves (13) for placing tension simulation supports (7) are symmetrically arranged on the left side and the right side of each middle groove (12), the two side grooves (13) are communicated with the middle groove (12) to form an inverted-mountain-shaped groove, the tension simulation supports (7) are arranged in the side grooves (13), the same pin holes are formed in the left side and the right side of each stretching frame main body (4) and the tension simulation supports (7), pin shafts are arranged in the pin holes to fix the tension simulation supports (7), angle steels (5) are symmetrically arranged on the front side and the back side of the upper end and the lower end, one side of the angle steel (5) is fixedly connected with the plate strip (6), the other side frame is arranged on the tension simulation bracket (7), and the upper end and the lower end of the plate strip (6) are respectively clamped in the two stretching frame main bodies (4).
2. The plate belt tension simulation device suitable for the universal tensile testing machine according to claim 1, wherein: the width l of the stretching clamping end (2)jw40-50 mm in height ljh50-60 mm in length ljl60-80 mm, rib plates (3) are respectively fixedly arranged on two sides of the clamping end (2), the lower ends of the rib plates (3) are fixedly connected with the stretching frame main body (4), and the thickness l of the rib plates (3)swIs 7-10 mm.
3. The plate belt tension simulation device suitable for the universal tensile testing machine according to claim 1, wherein: width l of stretching frame main body (4)dw100-150 mm, height ldh150-200 mm, length ldlEqual to the length b of the plate stripsSide wall thickness l of the main body (4) of the tension framegt25mm, side groove (13) width lgw15-20 mm in height lgh100-120 mm, the width l of the middle groove (12)owIs equal to14mm。
4. The plate belt tension simulation device suitable for the universal tensile testing machine according to claim 1, wherein: the tension simulation support (7) is composed of a plurality of rectangular strips meeting the fixed height relation, and the tension simulation supports (7) at the upper end and the lower end of the plate strip (6) respectively adopt rectangular strips with variable heights and rectangular strips with equal heights for 1.5hbRectangular strip of (2), rectangular strip thickness trIs 0.7 times the width of the side groove (13), i.e. tr＝0.7lgwThe height h of each rectangular strip in the variable-height tension simulation bracket (7) is changedriFrom a basic height hbAnd a tension-influencing height hiComposition of hri＝hb+hiBasic height hb＝0.4lgh。
5. The plate strip tension simulation device suitable for the universal tensile testing machine according to claim 1, wherein: the tension-influencing height hiI.e. h (y) satisfies the following relationship:
Figure FDA0002222626960000021
where f (y) is a function of the longitudinal stress distribution of the basic mode of flatness of the strip, hbSimulating the basic height, t, of a rectangular bar of the support in tensionrSimulating the thickness of the rectangular strip of the stent for tension, EsModulus of elasticity of the strip, ErSimulating the modulus of elasticity of rectangular strips of the stent for tension,/0The height of the plate belt (6); in the experimental process, the rectangular strip in the tension simulation support (7) bears the pressure effect, the plate belt (6) bears the tension effect, and the elastic moduli of the rectangular strip and the plate belt material of the tension simulation support (7) are respectively ErAnd EsAnd from the stress of the longest rectangular strip to the stress of the surface of the shortest rectangular strip contact angle steel (5), the rectangular strips and the plate belt (6) are elastically deformed. Assuming that the rectangular strip bears uniform compressive stress in the process, the plate strip (6) at the corresponding position generates uniform tensile strain along the longitudinal direction, and the compressive strain amount of the rectangular strip is epsilonr(y) corresponding platesThe longitudinal tensile strain of the belt (6) is epsilons(y), the rectangular strips and the strip (6) longitudinal stress balance can be obtained:
Erεr(y)＝Esεs(y) 1-2
in the experimental process, two stretching frames (9) which are vertically symmetrical are stretched towards two directions respectively, angle steel (5) is firstly contacted with the highest rectangular strip in a tension simulation support (7), along with stretching, the strip element of the angle steel (5) supported by the high rectangular strip deforms and extends, the pressure acted by the angle steel (5) is applied to the corresponding high rectangular strip, along with pressure increase, the height of the high rectangular strip is compressed, when the angle steel (5) is contacted with the lowest rectangular strip, namely, when the angle steel is just contacted but does not deform, according to the displacement s of the stretching frames (9), the initial length l of the plate strip0The minimum height h of the rectangular strip of the tension simulation bracketbThe tension-simulating support has an influence on the height h (y) hiStrain epsilonr(y) and strip strain εsThe geometrical relationship of (y) can be found in the following relationship:
finishing to obtain:
l0εs(y)＝h(y)-2[h(y)+hb]εr(y) 1-4
the united vertical type (1-2) and the united vertical type (1-4) form an equation set, and after the deformation is obtained through solution, the strain of any one tension simulation support rectangular strip is as follows:
Figure FDA0002222626960000032
according to the one-way compression constitutive relation of the rectangular strips in the height direction, the stress borne by any one tension simulation support rectangular strip is calculated as follows:
σr＝Erεr(y) 1-6
arranging a longitudinal stress field with variable height rectangular strip structure change along the width direction of the strip, taking the longitudinal stress field in a typical straightness mode as a structural target, and adopting a Chebyshev first stepThe orthonormal polynomial form is taken as the flatness fundamental mode, and the simulated longitudinal unit width tension load is given in accordance with the chebyshev fundamental flatness mode, see equations (1-7). 1-4 times Chebyshev orthogonal polynomial (N) after coordinate normalization processingcr＝1)。
Figure FDA0002222626960000033
NcrIs the critical load of the plate strip in buckling, is the load of the unit width line, bsIs the width of the plate strip, and y is a one-dimensional coordinate of the plate strip (6) in the width direction.
Assuming that the load borne by the tension simulation bracket is equal to the uniform distribution pressure of the line load at the width center of the tension simulation bracket lath along the thickness direction, the stress borne by the rectangular strip of the tension simulation bracket is calculated according to the uniform distribution line load and is as follows:
Figure FDA0002222626960000041
according to the relationships of the formulas (1-5), (1-6) and (1-8):
。
6. the plate belt tension simulation device suitable for the universal tensile testing machine according to claim 1, wherein: the angle steel (5) is 90-degree angle steel, and the length of the angle steel (5) is equal to the length b of the plate belt (6)sThe same, the angle steel (5) contacted with the rectangular strips with the same height is of an integral structure, and the angle steel (5) contacted with the rectangular strips with the variable height is cut into the number and the width b of the rectangular strips in the tension simulation bracket (7)riA plurality of bars each corresponding to each other, the width of the bars being denoted by bsi。
7. The strip tension simulator of claim 1, wherein the strip tension simulator is adapted to be used in a universal tensile testing machine,the method is characterized in that: diameter phi of the pin holexIs a rectangular strip width bri0.3 to 0.5 times of the diameter phi of the pin shaft (8)xzDiameter phi of pin holexLittle 2 ~ 6mm, the length of round pin axle (8) is tensile frame main part (4) width and middle part recess (12) width difference 0.5 times, promptly: lxz＝0.5(ldw-low)。
8. The plate belt tension simulation device suitable for the universal tensile testing machine according to claim 7, wherein: the hinge pin (8) positioned on the same side of the stretching frame main body (4) is connected into a whole through a mounting plate (10), and the mounting plate (10) is connected with the stretching frame main body (4) through a screw.
9. The plate belt tension simulation device suitable for the universal tensile testing machine according to claim 1, wherein: the height of the partition board (11) between the middle groove (12) and the side groove (13) is lower than that of the lowest rectangular strip in the tension simulation bracket (7).
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114112672A (en) * 2021-11-26 2022-03-01 无锡振华建设工程质量检测有限公司 Composite insulation board detection equipment
CN114112672B (en) * 2021-11-26 2023-09-08 无锡振华建设工程质量检测有限公司 Composite insulation board detection equipment

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