CN115290448A - NOL ring test device parameter determination method and test device - Google Patents
NOL ring test device parameter determination method and test device Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention relates to a method for determining parameters of an NOL ring test device and the test device, belonging to the technical field of composite material strong processing and testing. The sliding block is provided with a sliding dovetail groove guide structure on the upper surface of the base, and the sliding block can freely slide in the radial direction after being extruded by the ejection column; corresponding bolt connecting holes are further formed in the base, so that the base is conveniently connected with the bottom plate and the top plate. The bottom of the sliding block is provided with a dovetail groove structure, so that the sliding block can be guided to be tightly attached to the dovetail groove of the base conveniently, the inner side outline arc surface of the sliding block is provided with an inclined surface, the downward movement of the top column is converted into displacement movement of the sliding block conveniently, the radial expansion of the composite material annular sample piece is realized, the stress concentration phenomenon of the composite material annular sample piece is relieved, and the simulation of bearing the internal pressure load is more real and reliable.
Description
Technical Field
The invention relates to the field of composite material strong processing and testing, in particular to a method for determining parameters of an NOL ring testing device and the testing device.
Background
Compared with the traditional metal container, the composite material pressure container has the characteristics of light weight, high specific strength and the like, and the composite material is adopted, so that the passive mass of products such as a vehicle-mounted hydrogen storage cylinder, a rocket engine and the like can be greatly reduced, the strength of the pressure container is improved, and the carrying capacity of the pressure container is enhanced. The composite material pressure vessel often comprises a hoop winding layer and a spiral winding layer in the design process, and the hoop winding layer mainly bears most of internal pressure load in the internal pressure load process. Therefore, in the design and development process of the fiber winding pressure container, a composite material NOL ring experimental sample piece is required to be prepared to test the maximum bearing capacity provided by the material system under the forming process, so that a theoretical and data basis is laid for design check and experimental test of the fiber winding forming pressure container.
Generally, as shown in fig. 1, as can be seen from fig. 1, a conventional composite material NOL (Naval organic Laboratory) ring test device is divided into an upper part and a lower part, the middle part is separated by a certain distance, fig. 2 is an NOL ring tensile sample, and after tensile load is performed, the NOL ring test sample of a separation section has stress concentration, and the specific presentation form is as shown in fig. 3, as can be seen from fig. 3, the NOL of the separation section presents an obvious straightening state, which is not in accordance with the ideal loading form of the NOL of fig. 4, and finally the deformation form of the NOL ring test sample presents an ellipse-like state as shown in fig. 5, so that a curvature mutation occurs near the separation section, so that a stress concentration phenomenon exists nearby, and further, the actual exertion strength of the NOL ring test sample is smaller than that under an ideal internal pressure load. Therefore, the testing device is designed, so that the local stress concentration of the experimental sample piece in the testing process can be decomposed and transferred, and the additional load of the experimental sample piece is relieved.
Disclosure of Invention
The invention aims to provide a parameter determination method and a parameter determination device for an NOL ring test device, which are used for relieving the problem that a stress set exists in an annular experiment sample piece in the stretching process.
In order to achieve the purpose, the invention provides the following scheme:
a method of nolring test device parameter determination, the method comprising:
estimating the NOL test strength range;
giving the number of sliding blocks;
determining the arc length of the inner contour of the sliding block;
determining an inner contour stress value of the slider based on the inner contour arc length of the slider;
determining the length of the dovetail groove and the width of the dovetail groove;
determining a stress value of the root of the dovetail groove based on the length of the dovetail groove and the width of the dovetail groove;
determining a metal elastic limit strength value based on the slider inner contour stress value and the dovetail groove root stress value;
judging whether the metal elastic limit strength value meets the strength limit or not;
if not, resetting the number of sliding blocks;
if so, determining the inner diameter of the slide block, the arc length of the inner contour of the slide block, the arc length of the outer contour of the slide block, the length of the dovetail groove and the width of the dovetail groove.
Based on the above method of the present invention, the present invention further provides an NOL ring test apparatus, comprising:
the upper surface of the base is provided with a guide groove, and the lower surface of the base is provided with a groove;
the bottom plate is arranged in the groove;
the bottom of the sliding block is provided with a dovetail groove structure, the dovetail groove structure is arranged in the guide groove and matched with the guide groove in size, and the dovetail groove structure slides in the guide groove; the number of the sliding blocks is multiple, and the sliding blocks form a circular ring;
the NOL ring experiment sample piece is sleeved on the periphery of a circular ring formed by the sliding blocks;
and the top column is positioned in the circular ring, and the downward axial motion of the top column drives the radial motion of the sliding block to realize the radial expansion of the NOL ring experimental sample piece.
Optionally, the top pillar includes: the cylinder is arranged on the upper part of one surface with large bottom area of the circular truncated cone.
Optionally, the inner profile arc surface of the slider is an inclined surface, and the inclined surface is attached to the side wall of the circular truncated cone.
Optionally, both sides of the slider are provided with grooves.
Optionally, the upper surface of the base is provided with a bolt hole.
Optionally, the testing device further includes a top plate, and the top plate is located on the upper surface of the slider and connected to the base.
Optionally, the dovetail groove structure is in a convex shape.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the method, through an experimental equivalent internal pressure method, equivalent load of an NOL ring experimental sample piece during damage can be obtained, so that the limit value of the inner contour and the outer contour of the metal sliding block is determined, preparation is made for optimizing the overall structure of the sliding block, the appropriate inner contour size, the inner diameter, the dovetail groove width and the dovetail groove length of the sliding block can be obtained according to an optimization process, and the appropriate metal sliding block structure is also determined.
The experimental testing device comprises a base, a bottom plate, a top plate, a sliding block, a top column and other parts. The sliding block is provided with a sliding dovetail groove guide structure on the upper surface of the base, so that the sliding block can freely slide in the radial direction after being extruded by the top column; in addition, the base is further provided with corresponding bolt connecting holes, the base is convenient to be connected with the bottom plate and the top plate, the base is also convenient to be connected with a universal testing machine, a dovetail groove structure is designed at the bottom of the sliding block, the sliding block is convenient to be guided to be tightly attached to the dovetail groove of the base, an inclined surface is designed on an arc surface of the inner side outline of the sliding block, downward movement of the top column is convenient to be converted into displacement movement of the sliding block, and therefore radial expansion of the composite material annular sample piece is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a prior art NOL ring tensile test apparatus according to an embodiment of the present invention;
FIG. 2 is a NOL ring tensile specimen of an embodiment of the present invention;
FIG. 3 is a graph showing the stress and deformation of a sample in a tensile test using a conventional NOL ring tensile test apparatus according to an embodiment of the present invention;
FIG. 4 shows an ideal uniform stress distribution under the internal pressure load of the NOL ring test sample piece in the embodiment of the invention;
FIG. 5 shows a deformation state of an NOL ring test piece in a stretching process according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method for determining parameters of an NOL ring test apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic view of the sliding expansion of the test apparatus according to the embodiment of the present invention;
FIG. 8 is a force diagram of an NOL ring test sample according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a slider force according to an embodiment of the present invention;
FIG. 10 is a schematic view of a dovetail groove structure according to an embodiment of the present invention;
FIG. 11 is a schematic view of a design of a wedge angle of a slider and a top post according to an embodiment of the present invention;
FIG. 12 is a schematic structural view of the NOL ring test apparatus according to the embodiment of the present invention without removing the top plate;
fig. 13 is a schematic structural view of the NOL ring test apparatus according to the embodiment of the present invention after the top plate is removed.
FIG. 14 is a schematic view of a slider structure according to an embodiment of the present invention;
FIG. 15 is a schematic view of a base structure according to an embodiment of the present invention;
FIG. 16 is a schematic view of a top plate according to an embodiment of the present invention;
FIG. 17 is a schematic view of a top pillar structure according to an embodiment of the present invention;
fig. 18 is a schematic structural diagram of a bottom plate according to an embodiment of the present invention.
Description of the symbols:
the test device comprises a base-1, a bottom plate-2, a sliding block-3, an NOL ring test sample-4, a top column-5, a dovetail groove structure-6, a bolt avoiding space-7, a cylinder-8, a circular truncated cone-9, a bolt hole-10 and a top plate-11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method for determining parameters of an NOL ring test device and the test device, so as to solve the problem that a stress set exists in an annular experiment sample piece in the stretching process.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 6 is a flowchart of a method for determining parameters of an NOL ring test apparatus according to an embodiment of the present invention, and as shown in fig. 6, the method for determining parameters in the present invention includes the following steps:
step 101: the NOL test strength range is estimated.
Step 102: and giving the number of sliding blocks.
Step 103: and determining the arc length of the inner contour of the slide block.
Step 104: and determining the inner contour stress value of the slide block based on the inner contour arc length of the slide block.
Step 105: a dovetail length and a dovetail width are determined.
Step 106: and determining a dovetail groove root stress value based on the dovetail groove length and the dovetail groove width.
Step 107: and determining a metal elastic limit strength value based on the slider inner contour stress value and the dovetail groove root stress value.
Step 108: and judging whether the metal elastic limit strength value meets the strength limit or not.
Step 109: if not, the number of the sliding blocks is reset.
Step 110: if so, determining the inner diameter of the sliding block, the arc length of the inner contour of the sliding block, the arc length of the outer contour of the sliding block, the length of the dovetail groove and the width of the dovetail groove.
The specific calculation process is as follows:
according to the circumferential expansion deformation of the fiber winding layer, the equivalent external pressure of the NOL ring experimental sample piece can be obtained by inverse calculation according to the film theory of the pressure vessel:
in the formula: p is the equivalent pressure of the outer contour surface of the slider; sigma f NOL ring section strength; t is the NOL ring thickness; d is the NOL ring diameter.
Therefore, the equivalent pressure load of the outer contour surface of the slider is obtained, in order to design and determine the inner contour diameter size of the slider, the load needs to be equivalent to the inner contour surface, and the equivalent mode is expressed as follows:
in the formula: p' is the equivalent pressure of the inner contour of the sliding block; l' is the arc length of the inner profile of the sliding block; l is the arc length of the outer contour of the slide block.
The experimental device is designed to prepare the material 30CrMnSi, so that the safety coefficient can be given according to the relation between the material strength and the current equivalent pressure p', and the specific limited size of the inner contour arc length of the sliding block can be obtained. The concrete expression is as follows:
p'≤σ 1 (3)
in the formula: sigma 1 Is the elastic limit strength value of the metal material.
According to the radial expansion stress deformation, the middle ejection column needs to be designed into a conical structural form, so that wedge angles with different sizes determine the structural strength of the sliding block, the displacement ratio between the radial sliding block and the axial ejection column is also determined, and the radial expansion amount of the test sample piece can be obtained according to the descending displacement of the ejection column without considering the deformation of the metal sliding block in the test process of the sliding block. Neglecting the additional bending moment generated by the conical surface, the load applied in the radial direction and the axial direction can be expressed as follows:
in the formula: f1 is a radial load value; f2 is an axial load value; and F is the resultant load value generated by the top column on the conical surface. Then from the structural form and the above load split form one can get:
F2＝F1 tanα (5)
and the limiting range of the F2 value can be obtained by combining the dovetail groove structure at the bottom of the sliding block and introducing the safety coefficient:
F2≤λ 1 ahσ (6)
in the formula: a is a sliding blockUpper dovetail slot length; h is the width of the dovetail groove; lambda 1 A safety factor is set; σ is the elastic limit of the metal material.
Assuming that the material is T700 Dongli carbon fiber, the strength value sigma of the molded NOL ring test sample piece is f Is 2500MPa; according to the standard size of the NOL experimental sample, the thickness t is 1.5mm, and the width parameter b is 6mm. The equivalent radial pressure generated under this load can then be found to be:
because the internal and external contour dimension parameters of the sliding block and the dovetail groove structure dimension jointly determine whether the integral strength value of the sliding block meets the requirement of whether the metal sliding block yields in the experimental process, the iterative optimization calculation needs to be carried out on the segmentation number of the sliding block and the dovetail groove structure parameter, in order to ensure that the testing device and the NOL ring sample are kept attached in the testing process, the thickness of the sliding block is the same as that of the NOL ring sample, and the specific design iterative process is shown in FIG. 6.
The resulting structure of the NOL loop test device according to this optimization procedure is shown in FIGS. 7-13.
Considering that the NOL structure is an annular structure, it is desirable that the NOL structure can always present a circumferential expansion state during loading, and therefore, a tensile load applied to the NOL ring test sample by an original tensile test device needs to be converted into a radial expansion load so as to realize the radial movement of the whole test sample, and a specific movement relationship is shown in fig. 7. Referring to fig. 7, the test apparatus of the present invention includes: the test device comprises a base 1, a bottom plate 2, a sliding block 3, an NOL ring test sample piece 4 and a top column 5.
The upper surface of the base 1 is provided with a guide groove, and the lower surface of the base is provided with a groove;
the bottom plate 2 is arranged in the groove; fig. 18 is a schematic view of the structure of the bottom plate of the present invention, wherein (a) is a front view, and (b) is a left view.
A dovetail groove structure 6 is arranged at the bottom of the sliding block 3, as shown in fig. 18, the dovetail groove structure is in a convex shape, the dovetail groove structure 6 is arranged in the guide groove and matched with the guide groove in size, and the dovetail groove structure slides in the guide groove; the slider is a plurality of, and a plurality of sliders form the ring.
The NOL ring experimental sample piece 4 is sleeved on the periphery of a circular ring formed by the sliding blocks;
the support pillar is located in the ring, and the radial motion of slider is driven in the axial motion of support pillar downward, realizes the radial expansion of NOL ring experiment sample spare, as shown in FIG. 17, (a) part in FIG. 17 is the elevation, (b) part is the left view, (c) part is the top view, the support pillar includes: the cylinder 8 and round platform 9, the cylinder sets up the upper portion of the big one side of round platform bottom area.
The inner side contour arc surface of the sliding block is an inclined surface, and the inclined surface is attached to the side wall of the circular truncated cone.
Referring to fig. 14, specific details of the structure of the slider can be known, wherein in fig. 14, (a) is a front view, (b) is a left view, (c) is a top view, and (d) is a partially enlarged view of a dovetail groove structure, in order to ensure that the slider does not interfere with a bolt connecting the top plate and the base during movement, bolt avoiding spaces 7 are formed on boundaries of two sides of the slider, that is, grooves are formed on two sides of the slider.
Fig. 15 is a schematic structural diagram of a base of the testing apparatus, in which part (a) of fig. 15 is a front view, and part (b) is a left view, and a corresponding guide groove is designed on the base to ensure that the slider 3 can perform a reciprocating linear expansion motion. And a connecting bolt hole 10 is arranged on the base in order to connect the base with the bottom plate and a universal testing machine.
As shown in fig. 16, the testing device of the present invention further includes a top plate, wherein part (a) of fig. 16 is a front view, part (b) is a left view, the top plate is located on the upper surface of the slider and connected to the base 1, and the top plate is also provided with a plurality of bolt holes. Fig. 12 is a schematic view of the testing apparatus without the top plate removed, and fig. 13 is a schematic view of the testing apparatus with the top plate removed, and after the top plate is removed, it can be seen that a plurality of sliders 3 are arranged into a ring.
The device and the method have the following beneficial effects:
the invention discloses an optimized loading device for a composite material circumferential tensile strength experiment and a testing method thereof, belonging to the technical field of composite material strong processing and testing. The sliding block is provided with a sliding dovetail groove guide structure on the upper surface of the base, and the sliding block can freely slide in the radial direction after being extruded by the ejection column; in addition, the base is also provided with corresponding bolt connecting holes, so that the base is conveniently connected with the bottom plate and the top plate and is also conveniently connected with the universal testing machine. The bottom of the sliding block is provided with a dovetail groove structure, so that the sliding block can be guided to be tightly attached to a dovetail groove of the base conveniently, an inclined plane is designed on an arc surface of the inner profile of the sliding block, the downward movement of the top column is conveniently converted into displacement movement of the sliding block, and therefore the radial expansion of the composite material annular sample piece is achieved. So far, this experiment testing arrangement can convert the axial motion of fore-set into the radial motion of slider, and can disperse traditional NOL experiment sample piece testing arrangement's stress concentration phenomenon to a plurality of slider borders, has alleviated the stress concentration phenomenon of combined material annular sample piece, and is more true, reliable to the simulation that bears the internal pressure load.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A NOL loop test device parameter determination method is characterized by comprising the following steps:
estimating the NOL test strength range;
giving the number of sliding blocks;
determining the arc length of the inner contour of the sliding block;
determining an inner contour stress value of the slider based on the inner contour arc length of the slider;
determining the length of the dovetail groove and the width of the dovetail groove;
determining a stress value of the root of the dovetail groove based on the length of the dovetail groove and the width of the dovetail groove;
determining a metal elastic limit strength value based on the slider inner contour stress value and the dovetail groove root stress value;
judging whether the metal elastic limit strength value meets the strength limit or not;
if not, resetting the number of sliding blocks;
if so, determining the inner diameter of the sliding block, the arc length of the inner contour of the sliding block, the arc length of the outer contour of the sliding block, the length of the dovetail groove and the width of the dovetail groove.
2. An NOL loop test device, characterized in that the test device comprises:
the upper surface of the base is provided with a guide groove, and the lower surface of the base is provided with a groove;
the bottom plate is arranged in the groove;
the bottom of the sliding block is provided with a dovetail groove structure, the dovetail groove structure is arranged in the guide groove and matched with the guide groove in size, and the dovetail groove structure slides in the guide groove; the number of the sliding blocks is multiple, and the sliding blocks form a circular ring;
the NOL ring experiment sample piece is sleeved on the periphery of a circular ring formed by the sliding blocks;
and the top column is positioned in the circular ring, and the downward axial motion of the top column drives the radial motion of the sliding block to realize the radial expansion of the NOL ring experimental sample piece.
3. The NOL ring test device of claim 2, wherein the top post comprises: the cylinder is arranged on the upper part of one surface with large bottom area of the circular truncated cone.
4. The NOL ring test device of claim 3, wherein the inner profile arc surface of the slider is an inclined surface, and the inclined surface is attached to the side wall of the circular truncated cone.
5. The NOL ring test device of claim 2, wherein both sides of the slider are grooved.
6. The NOL ring test device of claim 2, wherein the upper surface of the base is provided with bolt holes.
7. The NOL ring test device of claim 2, further comprising a top plate positioned on an upper surface of the slider and coupled to the base.
8. The NOL ring test device of claim 2, wherein the dovetail groove structure is "convex" shaped.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116718476A (en) * | 2023-08-07 | 2023-09-08 | 清华大学 | Tensile strength testing tool and testing method for superconducting bridge joint |
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| CN116718476A (en) * | 2023-08-07 | 2023-09-08 | 清华大学 | Tensile strength testing tool and testing method for superconducting bridge joint |
| CN116718476B (en) * | 2023-08-07 | 2023-10-20 | 清华大学 | Tensile strength testing tool and testing method for superconducting bridge joint |
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