CN204718885U - Material Micro Mechanical Properties is biaxial stretch-formed-fatigue test system - Google Patents
Material Micro Mechanical Properties is biaxial stretch-formed-fatigue test system Download PDFInfo
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- CN204718885U CN204718885U CN201520301067.9U CN201520301067U CN204718885U CN 204718885 U CN204718885 U CN 204718885U CN 201520301067 U CN201520301067 U CN 201520301067U CN 204718885 U CN204718885 U CN 204718885U
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Abstract
The utility model relates to a kind of material Micro Mechanical Properties biaxial stretch-formed-fatigue test system, belongs to precision scientific instrument field.By applying orthogonal tensile load to test specimen, test specimen is made in one plane to there are two orthogonal tensions, simultaneously can also apply fatigue load to test specimen on the basis of tensile load, for studying the Micro Mechanical Properties of material in different loads form and magnitude of load situation.System is made up of precision loading-gear unit, tired unit, mechanics and the part such as deformation signal detecting unit, specimen holder unit.Advantage is: test system structure novelty is compact, uniaxial tensile test, biaxial stretch-formed test, uniaxial tension-testing fatigue, biaxial stretch-formed-testing fatigue can be realized respectively, good compatibility is had, the heterogeneous microstructure of material and the correlativity rule of deformation damage mechanism under dynamic research stretching-fatigue load operative condition with optical microscope.
Description
Technical field
The utility model relates to precision scientific instrument field, particularly a kind of material Micro Mechanical Properties biaxial stretch-formed-fatigue test system.Can be used as uniaxial tension, biaxial stretch-formed, single-revolution stretches-tired, biaxial stretch-formed-tired material Micro Mechanical Properties test platform uses, and wherein can also realize twin shaft as biaxial stretch-formed-tired material Micro Mechanical Properties test non-with tests such as fatigues frequently with tired and twin shaft frequently.And this system can carry out above-mentioned various material Micro Mechanical Properties tests under partial optical microscope, thus realization carries out Real Time Observation to the Micromechanics behavior of measured material and deformation damage process.Meanwhile, the semi-static load technology in drawing process is achieved by the worm and gear of speed reduction unit and big retarding ratio; The collection of the signals such as tensile force test specimen in test process born by mechanics and deformation signal detecting unit, the stretcher strain of test specimen, can the ess-strain course of matching measured material under respective loads effect, can with the Micro Mechanical Properties of this analysis of material; By process software, analyzing and processing is carried out to the power of mechanics and the collection of deformation signal detecting unit and deformation signal, closed-loop control can also be realized to test macro.
Background technology
Material is being carried out in the process of Mechanics Performance Testing, by instruments such as optical microscopes, omnidistance dynamic monitoring is carried out to the microdeformation damage that material under load effect occurs, more in depth can disclose the Micromechanics behavior of various types of materials and goods thereof, micromechanism of damage and the correlativity rule between material property and suffered load thereof.
In order to measure the important parameter such as elastic modulus, hardness, break limit, shear modulus of material and goods thereof, test based on micro nanometer mechanics, propose various test, wherein, about the method for testing stretched mainly comprises uniaxial tension, uniaxial tension-fatigue, biaxial stretch-formed etc.But, under actual conditions, the loading that material and goods thereof are subject to is often non-single-mode, as stretching/compressing-bending combined load pattern, stretching/compressing-tired combined load pattern, shearing-torsion combined load pattern etc., therefore, mechanical property and the degenerative lesion mechanism thereof of resolving the material under combined load model function have very important realistic meaning to the development of materialogy.
In addition, what the plate in Practical Project, shell structure parts bore is bidirectional load mostly, comprises single-crystal metal, concrete and part and has anisotropic compound substance, just study the mechanical property under its single-bearing Tensile load, not objective.Therefore, develop biaxial stretch-formed-fatigue test system, significant to the deformation damage mechanism of the mechanical property of material and material under research two-way stretch and fatigue load.
Summary of the invention
The purpose of this utility model be to provide a kind of material Micro Mechanical Properties biaxial stretch-formed-fatigue test system, solve the problems referred to above that prior art exists.The utility model can realize uniaxial tension mechanical test respectively, biaxial stretch-formed mechanics test, uniaxial tension-fatigue mechanics test, biaxial stretch-formed-fatigue mechanics test, wherein for biaxial stretch-formed-fatigue mechanics test, native system can also realize twin shaft with frequency fatigue loading and the non-same fatigue loading isotype frequently of twin shaft, described biaxial stretch-formed-tired material Micro Mechanical Properties test macro can also be compatible with partial optical microscope, Real Time Observation is carried out to material Micro Mechanical Properties test process, as the crack initiation to material, the failure damage process of Crack Extension and material carries out in-situ monitoring, in addition, the collection of the signals such as tensile force test specimen in test process born by mechanics and deformation signal detecting unit, the stretcher strain of test specimen, can the ess-strain course of matching measured material under respective loads effect, and then the Micromechanics behavior of material under biaxial stretch-formed-fatigue load effect, deformation damage mechanism are furtherd investigate.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
Material Micro Mechanical Properties is biaxial stretch-formed-fatigue test system, comprise accurate loading-gear unit, tired unit, mechanics and deformation signal detecting unit, specimen holder unit etc.; Wherein, accurate loading-gear unit is fixed by screws on base plate 5, tired unit is arranged on accurate loading-gear unit by two symmetrical guide rail I a32, slider I a31 and guide rail I b36, slider I b35, tired unit is connected with specimen holder unit respectively by four identical connecting rods 17, and mechanics and deformation signal detecting unit are arranged on specimen holder unit.
Described precision loading-gear unit provides the preload force of test macro and the power for the position that adjusts specimen holder unit, provides power, drive two-way ball-screw 11 to rotate through speed reduction unit 2, worm gear 25, worm screw 24 by direct current generator 1; The output shaft of described direct current generator 1 is connected with worm shaft 48 through shaft coupling 3, and worm gear 25 is arranged on two-way ball-screw 11, and worm gear 25, worm screw 24 play reduction of speed and increase the effect turned round; Described two-way ball-screw 11 is fixed solid on base plate 5 by guide rail II a9, slide block II a8, slide block II 29 and guide rail II b12, slide block II b13, slide block II 49e and leading screw supporting seat 28, two-way ball-screw 11 has been installed two identical feed screw nuts I, II 10,50, nut seat I, II 14,30 identical with two is respectively connected; Described nut seat I, II 14,30 is divided into upper and lower two parts, is connected by screw, reduces installation difficulty with this; Described nut seat I, II 14,30 is installed respectively guide rail I a32, slider I a31 and guide rail I b36, slider I b35, two slider I a, b31,35 are installed on lower supporting plate 34, support column 33 is connected by screw with upper backup pad 44, and upper backup pad 44 is fixedly connected with flexible hinge 15; Described feed screw nut I, II 10,50, nut seat I, II 14,30, guide rail I a, b32,36 and slider I a, b31,35 be and be arranged symmetrically with; Described guide rail I a, b32,36 become 20 ° of angles with surface level, therefore, when slide block a, b I 31,35 moves along guide rail I a, b32,36 respectively, support column 33 can be driven to move up and down and keep its horizontal level constant.
Described tired unit comprises flexible hinge 15, four identical piezoelectric stacks 16 and four identical connecting rods 17, and wherein flexible hinge 15 is symmetrical structure, to be arranged on lower supporting plate 44 by screw; Described four identical piezoelectric stacks 16 are arranged in flexible hinge 15 respectively, and by copper sheet pretension; Described connecting rod 17 one end is connected with flexible hinge 15 by bearing pin I 42, and the other end is connected with sensor holder 19 by pin shaft II 45, and sensor holder 19 is arranged on slide block IV 38 by screw.
Described mechanics and deformation signal detecting unit comprise four identical pulling force sensors 21 and two displacement transducers I, II 41,18, and pulling force sensor 21 is threaded connection between clamp body I 43 and sensor holder 19; Displacement transducer II 18 is arranged between two relative clamp bodies I, II 43,51, and displacement transducer I 41 and displacement transducer II 18 are arranged vertically; The axis of the pulling force that test specimen 40 bears and the pulling force sensor corresponding with it point-blank.
Described specimen holder unit by four clamp bodies I 43 and with it one to one pressing plate 39 form, test specimen is placed between clamp body I 43 and pressing plate 39, be connected by screw between clamp body I 43 and pressing plate 39, and by tightening screw, test specimen 40 clamped; Described clamp body I 43 is arranged on slide block IV 38, and slide block II c20 and slide block IV 38 are arranged on same guide rail III a37; Guide rail III b, c, d52,53,54 identical with guide rail III a37; Described clamp body I 43 and pressing plate 39 are processed with annular knurl, to ensure the reliability clamped.
Test macro of the present utility model can carry out material Micro Mechanical Properties in-situ test under the dynamic monitoring of optical microscope.Different according to in-situ observation object, can select optical microscope to monitor the germinating of test specimen crackle under load effect, expansion, to fracture process; Raman spectrometer can be selected to carry out microcell detection to surface of test piece, carry out stretching/fatigue load effect under the phase structure research, grain and boundary change, crack initiation etc. of material; Also X-ray diffractometer can be selected to carry out material phase analysis to test specimen, determine grain size and stress distribution, the special nature of research material and its Atomic Arrangement, crystalline phase change between relation etc.; Part scope can be with the use of, as optical microscope and Raman spectrometer etc.
Described guide rail III a, b37,52 are arranged on top board I 22, and guide rail III c, d53,54 are arranged on top board II 23, and column 6 is connected with top board II 23 and base plate 5 by screw thread; The connected mode of top board I 22 is identical with the connected mode of top board II 23; The pulling force that top board II 23 is subject to is transmitted on base plate 5 by column 6.
Described four identical piezoelectric stacks 16, wherein same tensile axis two piezoelectric stacks upwards export consistent, fix to keep the cross searching of test specimen position in test process.
In one plane, the tensile load of four ends loads by a loading unit is unified, and the applying of fatigue load is then separate at four stretchings-tired end place of test specimen, namely can apply fatigue load respectively to four stretchings-fatigue end.In test process, due to the symmetry of apparatus structure, basic holding position, test specimen center is constant, is conducive to realizing in-situ observation.Can at the cross searching of test specimen, namely the defect such as main area of observation coverage premade indentation of test specimen, is convenient to probe under different loads form and magnitude of load situation, the Micro Mechanical Properties of material and distortion thereof, damage mechanisms.
The utility model applies tensile load by the end that stretches to test specimen four simultaneously, the cross searching of test specimen is made in one plane to there are two orthogonal tensions, simultaneously can also apply fatigue load respectively to four of test specimen the end that stretches on the basis of tensile load, for studying the Micro Mechanical Properties of material in different loads form and magnitude of load situation; Based on the symmetry of test system structure, i.e. four end full symmetrics that stretch, and a shared loading unit carries out prestrain, the while of making specimen holder unit pull test specimen constant speed heterodromous, the cross searching of test specimen keeps static, and optical microscope easy to use carries out dynamic monitoring to material testing procedures; In addition, biaxial stretch-formed four end each use piezoelectric stacks that stretch carry out fatigue loading, and namely the fatigue loading of each end that stretches is separate, makes fatigue loading Scheme Choice diversity.
The beneficial effects of the utility model are: test system structure is novel, compact, quality is light and handy, material Micro Mechanical Properties in-situ test can be carried out under the dynamic monitoring of optical microscope, uniaxial tensile test, biaxial stretch-formed test, uniaxial tension-testing fatigue, biaxial stretch-formed-testing fatigue can be carried out, and twin shaft can also be realized with frequently and non-ly to test with two kinds of low-cycle fatigue frequently for biaxial stretch-formed-testing fatigue, accurate evaluation can be made to material and goods thereof the Micro Mechanical Properties under two-way stretch-fatigue loading model function and degenerative lesion mechanism; This test macro by means of partial optical microscope, can carry out Real Time Observation to test process, realizes in-situ observation.Take full advantage of the symmetry of this test system structure, and only carry out prestrain by a loading unit, ensure that symmetry and the synchronism of coaxial two ends that stretch in test process, also assures that the stability of test specimen cross searching in test test process.In sum, the utility model not only has good application, DEVELOPMENT PROSPECT, and to the development of in-situ testing technique and device, the progressive important in inhibiting of material Micro Mechanical Properties research.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms a application's part, and illustrative example of the present utility model and explanation thereof, for explaining the utility model, are not formed improper restriction of the present utility model.
Fig. 1 is the one-piece construction schematic diagram of test macro of the present utility model;
Fig. 2 is control principle block diagram of the present utility model;
Fig. 3 is accurate loading-gear unit structural representation of the present utility model;
Fig. 4 is tired unit of the present utility model, specimen holder unit and mechanics and deformation signal detecting unit structural representation;
Fig. 5 is tired unit of the present utility model and specimen holder cellular construction schematic diagram;
Fig. 6 is mechanics of the present utility model and deformation signal detecting unit structural representation;
Fig. 7 is that (solid line represents the position of the front area of observation coverage A of test and microscope camera lens to in-situ observation principle schematic of the present utility model, in test process, area of observation coverage A has tapered to dotted line position, simultaneously, the motion that the test specimen area of observation coverage followed by camera lens adjusts, and ensures that omnidistance dynamic monitoring is carried out in the microdeformation damage to material occurs).
In figure: in figure: 1, direct current generator; 2, speed reduction unit; 3, shaft coupling; 4, motor cabinet; 5, base plate; 6, column; 7, column platform; 8, slide block II a; 9, guide rail II a; 10, feed screw nut I; 11, two-way ball-screw; 12, guide rail II b; 13, slide block II b; 14, nut seat I; 15, flexible hinge; 16, piezoelectric stack; 17, connecting rod; 18 displacement transducers II; 19, sensor holder; 20, slide block II c; 21, pulling force sensor; 22, top board I; 23, top board II; 24, worm screw; 25, worm gear; 26, bearing; 27, bearing seat; 28, leading screw supporting seat; 29, slide block II d; 30, nut seat II; 31, slider I a; 32, guide rail I a; 33, support column; 34, lower supporting plate; 35, slider I b; 36, guide rail I b; 37, guide rail III a; 38, slide block IV; 39, pressing plate; 40, test specimen; 41, displacement transducer I; 42, bearing pin I; 43, clamp body I; 44, upper backup pad; 45, pin shaft II; 46, fixed head; 47, plate is stopped; 48, worm shaft; 49, slide block II e; 50, feed screw nut II; 51, clamp body II; 52, guide rail III b; 53, guide rail III c; 54, guide rail III d; 55, clamp clip.
Embodiment
Detailed content of the present utility model and embodiment thereof is further illustrated below in conjunction with accompanying drawing.
See shown in Fig. 1 to Fig. 7, material Micro Mechanical Properties of the present utility model is biaxial stretch-formed-and fatigue test system comprises accurate loading-gear unit, tired unit, mechanics and deformation signal detecting unit, specimen holder unit etc., wherein, accurate loading-gear unit is fixed by screws on base plate 5, tired unit passes through two symmetrical guide rail I a32, slider I a31 and guide rail I b36, slider I b35 is arranged on accurate loading-gear unit, tired unit is connected with specimen holder unit respectively by four identical connecting rods 17, mechanics and deformation signal detecting unit are arranged on specimen holder unit, utilize the symmetry of test system structure, the while of making specimen holder unit pull test specimen heterodromous, the cross searching of test specimen keeps static, and optical microscope easy to use carries out in-situ observation, test macro can realize uniaxial tensile test, biaxial stretch-formed test, uniaxial tension-testing fatigue, biaxial stretch-formed-testing fatigue respectively, good compatibility is had, the heterogeneous microstructure of material and the correlativity rule of deformation damage mechanism under dynamic research stretching-fatigue load operative condition with optical microscope.
Shown in Figure 3, described precision loading-gear unit provides the preload force of in-situ test system and the power for the position that adjusts specimen holder unit, there is provided power by the direct current generator 1 be fixed on motor cabinet 4, drive two-way ball-screw 11 to rotate through speed reduction unit 2, worm gear 25, worm screw 24; The output shaft of described direct current generator 1 is connected with worm shaft 48 through shaft coupling 3, and worm gear 25 is arranged on two-way ball-screw 11, and worm gear 25, worm screw 24 play reduction of speed and increase the effect turned round; Described two-way ball-screw 11 is by guide rail II a9, slide block II a8, slide block II d29 and guide rail II b12, slide block II b13, slide block II e49, and leading screw supporting seat solid 28 fixes on base plate 5, two-way ball-screw 11 has been installed two identical feed screw nuts I, II 10,50, nut seat I, II 14,30 identical with two is respectively connected; Described nut seat I, II 14,30 is divided into upper and lower two parts, is connected by screw, reduces installation difficulty with this; Described nut seat I, II 14,30 is installed respectively guide rail I a32, slider I a31 and guide rail I b36, slider I b35, two slider I a, b31,35 are installed on lower supporting plate 34, support column 33 is connected by screw with upper backup pad 44, and upper backup pad 44 is for fixing, connection flexible hinge 15; Described feed screw nut I, II 10,50, nut seat I, II 14,30, guide rail I a, b32,36 and slide block a, b I 31,35 be and be arranged symmetrically with; Described guide rail I a32, guide rail I b36 become 20 ° of angles with surface level, therefore, when slider I a, 31,35 moves along guide rail I a, a32,36 respectively, support column 33 can be driven to move up and down and keep its horizontal level constant.
Shown in Fig. 4 and Fig. 5, described tired unit comprises flexible hinge 15, four identical piezoelectric stacks 16 and four identical connecting rods 17, and wherein flexible hinge 15 is symmetrical structure, to be arranged on lower supporting plate 44 by screw; Described four identical piezoelectric stacks 16 are arranged in flexible hinge 15 respectively, and by copper sheet pretension; Described connecting rod 17 one end is connected with flexible hinge 15 by bearing pin I 42, and the other end is connected with sensor holder 19 by pin shaft II 45, and sensor holder 19 is arranged on slide block IV 38 by screw.
Described specimen holder unit by four clamp bodies I 43 and with it one to one pressing plate 39 form, test specimen is placed between clamp body I 43 and pressing plate 39, be connected by screw between clamp body I 43 and pressing plate 39, and by tightening screw, test specimen 40 clamped; Described clamp body I 43 is arranged on slide block IV 38, and slide block II c20 and slide block IV 38 are arranged on same guide rail III a37; Described clamp body I 43 and pressing plate 39 are processed with annular knurl, to ensure the reliability clamped.
Shown in Figure 6, described mechanics and deformation signal detecting unit comprise four identical pulling force sensors 21 and two displacement transducers I, II 41,18, and pulling force sensor 21 is threaded connection between clamp body I 43 and sensor holder 19; Displacement transducer II 18 is arranged between two relative clamp bodies I 43 and clamp body II 51, and displacement transducer 41 and displacement transducer II 18 are arranged vertically.
Described guide rail III a37, guide rail III b52 are arranged on top board I 22, and guide rail III c53, guide rail III d54 are arranged on top board II 23, and column 6 one end is connected with top board II 23 by screw thread, and the other end is connected with base plate 5 by column platform 7; The connected mode of top board I 22 is identical with the connected mode of top board II 23; The pulling force that top board II 23 is subject to is transmitted on base plate 5 by column 6.
Described worm shaft 48 one end is connected with shaft coupling 3, and the other end is arranged on bearing seat 27 by bearing 26.
Described displacement transducer II 18 is arranged on clamp body I 43 by fixed head 46 and clamp clip 55, the end of sensor and only plate 47 remain and contact, only plate 47 is arranged on clamp body II 51, before test, displacement transducer II 18 is in compressive state, in test process, along with the increase of the spacing of clamp body I 43 and clamp body II 51, displacement transducer II 18 slowly extends; The installation of displacement transducer I 41 and metering system identical with displacement transducer II 18.
Described four identical piezoelectric stacks 16, require that same tensile axis two piezoelectric stacks upwards export consistent, to keep the cross searching of test specimen motionless at test process situ, are convenient to in-situ observation.
Piezoelectric stack 16, connecting rod 17, force snesor 21, clamp body I 43 etc. that the four direction of described two-way stretch is corresponding are identical, ensure the cross searching not occurred level motion of test specimen 40 during two-way stretch, be convenient to carry out in-situ observation by microscope to test process.
The pulling force that described four identical force snesor 21 and test specimen 40 bear, ensure that the accuracy of force sensor measuring result point-blank.
See Fig. 1 to Fig. 7, before the test macro of invention is installed, need carry out demarcating to four that use in test macro identical force snesor 21 and two displacement transducers II, I 18,41 and correct, then test macro is installed, debug.Before carrying out material mechanical performance test, need to carry out reset operation to specimen holder unit, specimen holder unit is required to adjust to suitable position to position test specimen and to clamp, and require that displacement transducer II, I 18,41 is all in pressured state after resetting, and ensure that elongation that it allows is greater than the tensile elongation of test specimen.
Experimentally object needs, select suitable measuring method, i.e. uniaxial tensile test, biaxial stretch-formed test, uniaxial tension-testing fatigue or biaxial stretch-formed-testing fatigue, the testing fatigue wherein related to mainly refers to that low-cycle fatigue is tested, and carry out on the basis that test specimen is stretched, namely test specimen carries out medium and low frequency extension test under having certain distortion or certain loading condition in advance.Therefore the testing research Main Analysis carried out with invented test macro be elasticity modulus of materials E, yield strength σ
s, strength degree σ
b, the mechanical property parameters such as elongation after fracture A, reduction of area Z.Wherein,
Elastic modulus
Yield strength
Strength degree
Elongation after fracture
Reduction of area
Wherein, σ: the stress of material, ε: the strain of material, F
eL: the material load that lower yield point is corresponding, F
b: the maximum load of material, S
0: material original section amasss, S
u: material is had no progeny sectional area, L
0: the original gauge length of material, L
u: material is had no progeny gauge length.
The mechanical property of material is mainly reflected in the deformation and failure performance etc. of material under load effect.And the parameters such as the elastic modulus of material, break limit, fatigue strength are topmost tested objects in material mechanical performance test, the elastic modulus of material, yield strength, strength degree, elongation after fracture and reduction of area can be measured by extension test, thus weigh the mechanical property of material when bearing tensile load.By the surrender of load-displacement curves research material under biaxial tensile loading effect, destructive process.And the alterante stress that CYCLIC LOADING power produces can produce permanent damage to material local, and bring out the germinating of crackle, expansion, unstability.The impact of fatigue load on material mechanical performance can be measured by stretching-testing fatigue.
In the whole process of test, in order to the crack initiation of Real-Time Monitoring test specimen, expansion, unstability situation, test specimen is needed to carry out polishing, corrosion treatment before test, dynamic monitoring is carried out by optical microscope imaging system, and image can be recorded simultaneously, also can the engineering stress strain curve of Real-time Obtaining exosyndrome material mechanical property and other mechanics parameters in conjunction with debugging software.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All the utility model is done any amendment, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. material Micro Mechanical Properties biaxial stretch-formed-fatigue test system, it is characterized in that: comprise accurate loading-gear unit, tired unit, mechanics and deformation signal detecting unit, specimen holder unit; Wherein, accurate loading-gear unit is fixed by screws on base plate (5), tired unit passes through two symmetrical guide rail I a (32), slider I a (31) and guide rail I b (36), slider I b (35) and is arranged on accurate loading-gear unit, tired unit is connected with specimen holder unit respectively by four identical connecting rods (17), and mechanics and deformation signal detecting unit are arranged on specimen holder unit.
2. material Micro Mechanical Properties according to claim 1 biaxial stretch-formed-fatigue test system, it is characterized in that: described precision loading-gear unit provides preload force and the power for the position that adjusts specimen holder unit, there is provided power by direct current generator (1), drive two-way ball-screw (11) to rotate through speed reduction unit (2), worm gear (25), worm screw (24); The output shaft of described direct current generator (1) is connected with worm shaft (48) through shaft coupling (3), worm gear (25) is arranged on two-way ball-screw (11), and worm gear (25), worm screw (24) play reduction of speed and increase the effect turned round; Described two-way ball-screw (11) is fixed solid on base plate (5) by guide rail II a (9), slide block II a (8), slide block II (29) and guide rail II b (12), slide block II b (13), slide block II (49) e and leading screw supporting seat (28), two-way ball-screw (11) has been installed two identical feed screw nuts I, II (10,50), nut seat I, II (14,30) identical with two is respectively connected; Described nut seat I, II (14,30) is divided into upper and lower two parts, is connected by screw, reduces installation difficulty with this; Described nut seat I, II (14,30) guide rail I a (32), slider I a (31) and guide rail I b (36), slider I b (35) have been installed respectively, two slider I a, b (31,35) are installed on lower supporting plate (34), support column (33) is connected by screw with upper backup pad (44), and upper backup pad (44) is fixedly connected with flexible hinge (15); Described feed screw nut I, II (10,50), nut seat I, II (14,30), guide rail I a, b (32,36) and slider I a, b (31,35) are and are arranged symmetrically with; Described guide rail I a, b (32,36) become 20 ° of angles with surface level, therefore, when slide block a, b I (31,35) moves along guide rail I a, b (32,36) respectively, support column (33) can be driven to move up and down and keep its horizontal level constant.
3. material Micro Mechanical Properties according to claim 1 biaxial stretch-formed-fatigue test system, it is characterized in that: described tired unit comprises flexible hinge (15), four identical piezoelectric stacks (16) and four identical connecting rods (17), wherein flexible hinge (15) is symmetrical structure, is arranged on (44) on lower supporting plate by screw; Described four identical piezoelectric stacks (16) are arranged in flexible hinge (15) respectively, and by copper sheet pretension; Described connecting rod (17) one end is connected with flexible hinge (15) by bearing pin I (42), the other end is connected with sensor holder (19) by pin shaft II (45), and sensor holder (19) is arranged on slide block IV (38) by screw.
4. material Micro Mechanical Properties according to claim 1 biaxial stretch-formed-fatigue test system, it is characterized in that: described mechanics and deformation signal detecting unit comprise four identical pulling force sensors (21) and two displacement transducers I, II (41,18), and pulling force sensor (21) is threaded connection between clamp body I (43) and sensor holder (19); Displacement transducer II (18) is arranged between two relative clamp bodies I, II (43,51), and displacement transducer I (41) and displacement transducer II (18) are arranged vertically; The axis of the pulling force that test specimen (40) bears and the pulling force sensor corresponding with it point-blank.
5. material Micro Mechanical Properties according to claim 1 biaxial stretch-formed-fatigue test system, it is characterized in that: described specimen holder unit by four clamp bodies I (43) and with it one to one pressing plate (39) form, test specimen is placed between clamp body I (43) and pressing plate (39), be connected by screw between clamp body I (43) and pressing plate (39), and by tightening screw, test specimen (40) clamped; Described clamp body I (43) is arranged on slide block IV (38), and slide block II c (20) and slide block IV (38) are arranged on same guide rail III a (37); Guide rail III b, c, d (52,53,54) are identical with guide rail III a (37); Described clamp body I (43) and pressing plate (39) are processed with annular knurl, to ensure the reliability clamped.
6. material Micro Mechanical Properties according to claim 5 biaxial stretch-formed-fatigue test system, it is characterized in that: described guide rail III a, b (37,52) are arranged on top board I (22), guide rail III c, d (53,54) are arranged on top board II (23), and column (6) is connected with top board II (23) and base plate (5) by screw thread; The connected mode of top board I (22) is identical with the connected mode of top board II (23); The pulling force that top board II (23) is subject to is transmitted on base plate (5) by column (6).
7. material Micro Mechanical Properties according to claim 3 biaxial stretch-formed-fatigue test system, it is characterized in that: described four identical piezoelectric stacks (16), wherein same tensile axis two piezoelectric stacks upwards export consistent, fix to keep the cross searching of test specimen position in test process.
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| CN104913974A (en) * | 2015-05-12 | 2015-09-16 | 吉林大学 | Material micro-mechanical property biaxial tension-fatigue test system and test method thereof |
| CN105928783A (en) * | 2016-06-27 | 2016-09-07 | 西南交通大学 | Multiaxial fatigue performance test fixture for round bar specimen |
| CN106018077A (en) * | 2016-06-27 | 2016-10-12 | 西南交通大学 | Test fixture for multi-axial fatigue crack propagation performance of CT samples |
| CN108287107A (en) * | 2018-03-20 | 2018-07-17 | 国网山东省电力公司济宁供电公司 | A kind of hot elongation test holder and its application method |
| CN109580355A (en) * | 2019-01-08 | 2019-04-05 | 韩永胜 | Biaxial stretch-formed mechanics performance testing apparatus and micro mechanical property test equipment in situ |
| CN110095216A (en) * | 2019-05-31 | 2019-08-06 | 南京工程学院 | A kind of two dimension prestress application device and its working method |
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2015
- 2015-05-12 CN CN201520301067.9U patent/CN204718885U/en not_active Withdrawn - After Issue
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| CN104913974A (en) * | 2015-05-12 | 2015-09-16 | 吉林大学 | Material micro-mechanical property biaxial tension-fatigue test system and test method thereof |
| CN104913974B (en) * | 2015-05-12 | 2017-12-22 | 吉林大学 | The biaxial stretch-formed fatigue test system of material Micro Mechanical Properties and its method of testing |
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| CN106018077A (en) * | 2016-06-27 | 2016-10-12 | 西南交通大学 | Test fixture for multi-axial fatigue crack propagation performance of CT samples |
| CN108287107A (en) * | 2018-03-20 | 2018-07-17 | 国网山东省电力公司济宁供电公司 | A kind of hot elongation test holder and its application method |
| CN109580355A (en) * | 2019-01-08 | 2019-04-05 | 韩永胜 | Biaxial stretch-formed mechanics performance testing apparatus and micro mechanical property test equipment in situ |
| CN110095216A (en) * | 2019-05-31 | 2019-08-06 | 南京工程学院 | A kind of two dimension prestress application device and its working method |
| CN112630029A (en) * | 2020-12-15 | 2021-04-09 | 陕西航天技术应用研究院有限公司 | Meshed fabric mechanical property testing device |
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Granted publication date: 20151021 Effective date of abandoning: 20171222 |