CN203337481U - In-situ test device for micro mechanical properties of material in stretching-shearing composite loading mode - Google Patents
In-situ test device for micro mechanical properties of material in stretching-shearing composite loading mode Download PDFInfo
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- CN203337481U CN203337481U CN2013203116871U CN201320311687U CN203337481U CN 203337481 U CN203337481 U CN 203337481U CN 2013203116871 U CN2013203116871 U CN 2013203116871U CN 201320311687 U CN201320311687 U CN 201320311687U CN 203337481 U CN203337481 U CN 203337481U
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Abstract
The utility model relates to an in-situ test device for micro mechanical properties of a material in a stretching-shearing composite loading mode, and belongs to the field of in-situ mechanical property test. Each of a stretching module and a shearing module consists of a motor power assembly, a transmission assembly, an execution assembly, a clamping support assembly and a signal detection and control assembly; the shearing module also comprises a piezoelectric driving assembly, and can apply a high-frequency shear fatigue load to a test piece. A hollow cup rotor direct-current motor is connected with a planetary gear reduction box and connected with a precision two-way ball screw through a worm wheel and worm transmission component, and a square nut connected with a ball screw nut is supported and guided through guide rails on two sides. Force and displacement signals of two loads are acquired by means of a precision force sensor and a linear potentiometer respectively. The device is small in size, compact in structure and high in test precision, can realize test of a stretching load and a shearing load under different strain rates and stress ratios, and can be compatible with a carrying platform of micro-imaging equipment such as a metallographic microscope.
Description
Technical field
The utility model relates to the in-situ mechanical field tests, material Micro Mechanical Properties in-situ testing device under particularly a kind of stretching-shearing compound loading pattern.This device can be used as stretching and pure shear bi-material Mechanics Performance Testing device is independently used, and can also realize drawing and cut the combined load test of two kinds of load under difference loading sequential, can carry out high frequency shearing resistance fatigue property test simultaneously; Test unit can be placed under the micro-imaging equipment such as metaloscope and draw the microscopic pattern of cutting the combined load loading procedure to carry out in-situ observation to test specimen, as the generation of microfissure, grow up and extended mode etc.; Can realize collection, conversion and control to load/displacement signal, with a kind of comparatively novel mechanical characteristic of method Accurate Measurement material under micro-nano-scale.
Background technology
The in-situ mechanical test refers under the micro-/ nano yardstick to be carried out in the process of Mechanics Performance Testing material for test, and a kind of mechanical measuring and calculation method of omnidistance in-situ monitoring is carried out in microdeformation material under various loads occurred by instruments such as electron microscope, atomic force microscope and optical microscopes, damage.In the correlativity rule of this technology between type, size and the material property of surveying load, also from microcosmic point, disclosed mechanical characteristic, the Damage mechanism of various types of materials and goods thereof, the mechanical behavior of deep understanding material under the complicated applied force state has been very helpful.In the category of many micro nanometer mechanics performance tests, the parameters such as elastic modulus, shear modulus, yield limit, break limit, bending modulus, hardness are topmost tested objects in micro-member mechanical property testing, a variety of method of testings have been produced for these mechanical parameters, as stretching/compressing method, bending method, shearing method, torsional technique, nano impress/cut and eardrum method etc.
Material and goods thereof often are subject to the effect of non-single load under actual condition, cut combination, stretch bending combination etc. as drawn, the test mode of single load effect may not presentation materials mechanical property under true service state, as material, under action of pulling stress, often make its shear stress that critical rupture failure occurs much smaller than its shear resistance, under shear stress, its tension that critical rupture failure occurs is much smaller than its tensile strength.In existing research, the loading of combined load pattern be mainly by by test specimen by realizing with stretching axis irregular clamping at an angle to each other, the loading force that is drive source output is mainly the axial force stretched, and by disalignment or not contour stretch mode, makes material internal different combined load test forms occur.This method of testing has caused two or more load modes can't independent loads or load successively, just be difficult to realize the parsing to different single load patterns, also can't mechanical property and the sex change damage mechanism under the Action of Combined Loads of different stress combinations make accurate evaluation with regard to material and goods thereof.
Current in-situ nano mechanical test technology has following limitation: (1) most in situ nanoindentations concentrate on take micro-/receive the Mechatronic Systems principle as the basis, the atomic minor structures such as nanotube, nano wire and membraneous material are carried out on simple in-situ nano extension test, lack the further investigation to the trans-scale in-situ micro-/ nano Mechanics Performance Testing of macro-size (membraneous material or three-dimensional test specimen); (2) current in-situ mechanical test is mainly carried out respectively in-situ nano extension test and original position impression test by business-like in-situ nano tensilometer and nano-hardness tester, commercialization testing apparatus somewhat expensive, method of testing is single, and the mechanical test under the multi-load composite mode to material can not be provided; (3), when carrying out fatigue property test, current in situ fatigue test machine generally only can provide the following low-cycle fatigue test of 50HZ, can not reflect test specimen and goods thereof the mechanical property under the tired operating mode of reality.
In position before tensile shear situ composite load mechanical property testing technology application, tension test and shear test are generally to rely on large-scale Material Testing Machine to the test specimen test of being offed normal.Testing machine is loaded test specimen with uniform rate according to relevant criterion, by the computing machine be connected with testing machine, draws load-deflection curve, and then obtains stress-strain curve under the associated load effect.Therefore, traditional Material Testing Machine be test specimen is loaded into and breaks or cut off after, just draw the mechanics parameter such as the tensile yield limit, the pulling strengrth limit, shear Yield strength, the shear resistance limit of material; And the conventional bending testing machine for be mostly the grand material yardstick of large scale test specimen, do not relate to the in-situ observation under the high resolving power micro imaging system, can't carry out more deeply the Micromechanics behavior of combined load and material and the associativity research of sex change damage process.
Therefore, design a kind of structure compact, dependable performance, precision high and can draw and cut the combined load test unit and be of great significance with the original position of micro-imaging hardware compatibility.
Summary of the invention
The purpose of this utility model is to provide material Micro Mechanical Properties in-situ testing device under a kind of stretching-shearing compound loading pattern, has solved the problems referred to above that prior art exists.This device is that the macroscopical test specimen more than grade is implemented micro/nano level stretch-the shear test unit of material Micro Mechanical Properties in-situ test under the compound loading pattern for characteristic dimension.The characteristics such as the utlity model has that volume is small and exquisite, compact conformation, high, the available content measurement of measuring accuracy are abundant, can be in the micro imaging systems such as optical microscope microdeformation and the damage and failure process of the macroscopical test specimen of in-situ observation geometric feature sizes more than grade under Action of Combined Loads; Can carry out when original position draws and cut test, in conjunction with the related software algorithm, automatic Fitting generates the stress-strain diagram under stretching, shear loads, can obtain the important mechanics parameters such as elastic modulus, modulus of shearing, tensile yield/break limit and shear yielding/break limit of material; Also can be sheared the high-cycle fatigue test to material test specimen by the piezo-electric drive units arranged on shear module, be reflected the shearing resistance fatigue behaviour of material sample under real operating mode.The utility model provides a kind of new proving installation, can draw and cut the combined load mechanical test three-dimensional test specimen enforcement trans-scale in-situ more than the characteristic dimension grade, the micro-imaging equipment such as cooperation optical microscope material are implemented in-situ observation to microdeformation, damage and the fracture process of material, for Measurement of Material Mechanical Performance under the combined load pattern provides new method.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
Material Micro Mechanical Properties in-situ testing device under stretch-shearing compound loading pattern, comprise the stretching load-on module and shear load-on module two parts, the agent structure of stretching load-on module and shearing load-on module consists of Power Component, transmission and executive module, input and Control Component, clamping supporting component respectively;
The assembly relation of the Power Component of described stretching load-on module, transmission and executive module is: drag cup rotor direct current generator I 2 is connected with planetary gear reduction box I 3, by worm-gears, with accurate bidirectional ball-screw I 39, be connected again, stretching square nut I, II 27,43 are rigidly connected by sunk screw with two-way ball-screw nut I, II 46,48 respectively, and stretching square nut I, II 27,43 supported guiding by two side rails I 45; Wherein, drag cup rotor direct current generator deceleration assembly and electric machine assembly bearing I 4 are fastenedly connected, and electric machine assembly bearing I 4 is fixedly connected with base plate 8; The worm screw I 5 be enclosed within on planetary gear reduction box I 3 output shafts is fixed by trip bolt, worm gear I 6 also is rigidly connected on accurate bidirectional ball-screw I 39 by trip bolt, and accurate bidirectional ball-screw I 39 is connected with base plate 8 by leading screw supporting seat I 7 with precision bearing; Stretching square nut I, II 27,43 are connected by sunk screw with the slide block of guide rail I 45 respectively, and guide rail I 45 is rigidly connected with base plate 8;
The assembly relation of the Power Component of described shearing load-on module, transmission and executive module is: drag cup rotor direct current generator II 10 is connected with planetary gear reduction box II 11, by worm-gears, with accurate bidirectional ball-screw II 30, be connected again, shearing square nut I, II 18,32 are rigidly connected by sunk screw with two-way ball-screw nut III, IV 47,49 respectively, and shear square nut I, II 18,32 by two side rails II, III 20,31 support guiding; Wherein, drag cup rotor direct current generator deceleration assembly and electric machine assembly bearing II 12 are fastenedly connected, and electric machine assembly bearing II 12 is fixedly connected with base plate 8; The worm screw II 13 be enclosed within on planetary gear reduction box II 11 output shafts is fixed by trip bolt, worm gear II 14 also is rigidly connected on accurate bidirectional ball-screw II 30 by trip bolt, and accurate bidirectional ball ball-screw II 30 is connected with base plate 8 by leading screw supporting seat II 15 with precision bearing; Shearing square nut I, II 18,32 are connected by sunk screw with the slide block of guide rail II, III 20,31 respectively, and guide rail II, III 20,31 are rigidly connected with base plate 8 respectively.
Described input and Control Component comprise photoelectric encoder I, II 1,9, power sensor I, II, III 24,19,33 and linear potentiometer I, II 44,41, can be used as the feedback sources of direct current generator I, II 2,10 Precision Pulses/direction closed loop control mode, and can realize the accurate detection of tensile load/displacement in the combined load test, shear-type load/displacement; Described photoelectric encoder I, II 1,9 coaxially are connected with direct current generator I, II 2,10 respectively; The power sensor I 24 of stretching load-on module is connected with fixture support frame I 25, the other end and power sensor fixed dam 23 are threaded connection, and use fastening nuts, the main body of linear potentiometer I 44 is fixed on stretching square nut II 43 by sunk screw, and the guide rod end of linear potentiometer I 44 contacts with potentiometer guide rod pressing plate I 21; The power sensor II of shearing load-on module, the two ends of III 19,33 are connected with cutting head I, II 22,29 and flexible hinge I, II 16,34 ends respectively, the main body of linear potentiometer II 41 is fixed in and is fastened on the potentiometer bracing frame 40 of shearing on square nut II 32 by sunk screw, and the guide rod end keeps in touch with the potentiometer guide rod pressing plate II 42 on the shearing square nut I 18 that is fixed on opposite side; The flexible direction that is subject to force direction, linear potentiometer I, II 44,41 of power sensor I, II, III 24,19,33 is consistent with the deformation direction of test specimen 38 under two kinds of loads.
Integrated Piezoelectric Driving assembly on described shearing load-on module, comprise piezoelectric stack I, II 17,35 and flexible hinge I, II 16,34, described piezoelectric stack I, II 17,35 are installed on respectively in the square groove of flexible hinge I, II 16,34, with cutting head I, II 22,29, keep coaxial; Flexible hinge I, II 16,34 are rigidly connected with shearing square nut I, II 18,32 respectively by sunk screw, and flexible hinge I, II 16,34 opposite sides are threaded connection with power sensor II, III 19,33 respectively.During 17,35 work of piezoelectric stack I, II all the time in pressured state, shear module stacks I in given stress level lower piezoelectric, II 17,35 has certain displacement and load fan-out capability, flexible hinge I, II 16,34 can guarantee, according to certain scale-up factor, the accurate shift reciprocately of piezoelectric stack I, II 17,35 outputs is passed to cutting head I, II 22,29 places, act on test specimen 38 and cut zone, simulation material bears the state of tired shear-type load, and wherein cutting head I, II 22,29 are made by the superhard alloy material.In addition, owing to having processing and rigging error, the cutting head I of both sides, II 22,29 exist and can not act on the possibility on test specimen 38 simultaneously, and at this moment the Piezoelectric Driving assembly can provide the micrometric displacement of shear module, guarantee that cutting head I, the II 22,29 of test specimen both sides acts on simultaneously.
Described clamping supporting component comprises fixture support frame I, II 25,37, fixture pressing plate I, II 26,36 and standard specimen 38, described fixture pressing plate I, II 26,36 are bolted with fixture support frame I, II 25,37 respectively, fixture support frame II 37 is rigidly connected by sunk screw and stretching square nut II 43, and the fixture support frame I 25 of opposite side is supported on stretching square nut I 27 by cross slideway 28; The surface of contact of fixture pressing plate I, II 26,36 and fixture support frame I, II 25,37 and test specimen 38 all is set to fine and close knurling structure, guarantees the firm clamping of test specimen 38.
Accurate bidirectional ball-screw I, II 39,30 that described stretching load-on module and the two-way linear of shearing load-on module move through two height alternative arrangement realize, this accurate bidirectional ball-screw I, II 39,30 are provided with two sections little helical pitch raceways that rotation direction is contrary; The middle part of test specimen 38 is also stressed concentrated zone, transmission by accurate bidirectional ball-screw I, II 39,30, the two-way ball-screw nut I of both sides, II, III, IV 46,48,47,49 can be moved by synchronous backward, can realize standard specimen 38 centres the most central in imaging region all the time in the process loaded, be convenient to real-time monitored and the record of imaging device.
Described stretching load-on module and shearing load-on module are realized drive load respectively, and the motion sequential is controlled, and test unit can be realized respectively extension test, pure shear test and the test of stretch-shearing combined load.
Under described stretching-shearing compound loading pattern, material Micro Mechanical Properties in-situ testing device structure is small and exquisite, can realize the article carrying platform compatibility with micro-imaging equipment such as metaloscopes, in the test sample mechanical property, sample is provided to the in-situ observation of mechanical behavior and failure mode.
The beneficial effects of the utility model are: with conventional art, compare, the utlity model has the characteristics such as volume is small and exquisite, compact conformation, rigidity is high, measuring accuracy is high, available content measurement is abundant, can be compatible with the article carrying platform of the micro-imaging equipment such as metaloscope, can be stretched to the three-dimensional macro test specimen of various materials and be sheared the trans-scale in-situ mechanical test under combined load, and can be provided at the highdensity plywood testing fatigue under certain tensile load.Synchronous detection by load/displacement signal, in conjunction with the related software algorithm, but automatic Fitting generates and draws the stress-strain diagram of cutting under Action of Combined Loads, and can realize drawing stretching and shear two kinds of load and load the multiple combination mode of sequential in difference, to material and goods thereof combined load under microdeformation carry out dynamic online observation, to disclose mechanical behavior and the damage and failure mechanism of material under micro-nano-scale.
In sum, the utility model has enriched original position micro nanometer mechanics performance test field, has promoted the development of material mechanical performance test equipment, has good development prospect.
The accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and illustrative example of the present utility model and explanation thereof, for explaining the utility model, do not form improper restriction of the present utility model.
Fig. 1 is perspective view of the present utility model;
Fig. 2 is schematic top plan view of the present utility model;
Fig. 3 is that schematic diagram is looked on the right side of the present utility model;
Fig. 4 is front elevational schematic of the present utility model;
The layout schematic diagram that Fig. 5 is two two-way ball-screws of the present utility model;
The structural representation that Fig. 6 is stretching module of the present utility model;
The structural representation that Fig. 7 is shearing Piezoelectric Driving assembly of the present utility model;
The structural representation that Fig. 8 is test specimen clamping support section of the present utility model.
In figure:
1, photoelectric encoder I; 2, drag cup rotor direct current generator I; 3, planetary gear reduction box I; 4, electric machine assembly bearing I; 5, worm screw I; 6, worm gear I; 7, leading screw supporting seat I; 8, base plate; 9, photoelectric encoder II; 10, drag cup rotor direct current generator II; 11, planetary gear reduction box II; 12, electric machine assembly bearing II; 13, worm screw II; 14, worm gear II; 15, leading screw supporting seat II; 16, flexible hinge I; 17, piezoelectric stack I; 18, shear the square nut I; 19, power sensor II; 20, guide rail II; 21, potentiometer guide rod pressing plate I; 22, cutting head I; 23, power sensor fixed dam; 24, power sensor I; 25, fixture support frame I; 26, fixture pressing plate I; 27, stretching square nut I; 28, cross slideway; 29, cutting head II; 30, accurate bidirectional ball-screw II; 31, guide rail III; 32, shear the square nut II; 33, power sensor III; 34, flexible hinge II; 35, piezoelectric stack II; 36, fixture pressing plate II; 37, fixture support frame II; 38, standard specimen; 39, accurate bidirectional ball-screw I; 40, potentiometer bracing frame; 41, linear potentiometer II; 42, potentiometer guide rod pressing plate II; 43, stretching square nut II; 44, linear potentiometer I; 45, guide rail I; 46, two-way ball-screw nut I; 47, two-way ball-screw nut III; 48, two-way ball-screw nut II; 49, two-way ball-screw nut IV.
Embodiment
Further illustrate detailed content of the present utility model and embodiment thereof below in conjunction with accompanying drawing.
Referring to shown in Fig. 1 to Fig. 8, material Micro Mechanical Properties in-situ testing device under stretching of the present utility model-shearing compound loading pattern, comprise the stretching load-on module and shear load-on module two parts, the agent structure of stretching load-on module and shearing load-on module consists of Power Component, transmission and executive module, input and Control Component, clamping supporting component respectively;
The assembly relation of the Power Component of described stretching load-on module, transmission and executive module is: drag cup rotor direct current generator I 2 is connected with planetary gear reduction box I 3, by worm-gears, with accurate bidirectional ball-screw I 39, be connected again, stretching square nut I, II 27,43 are rigidly connected by sunk screw with two-way ball-screw nut I, II 46,48 respectively, and stretching square nut I, II 27,43 supported guiding by two side rails I 45; Wherein, drag cup rotor direct current generator deceleration assembly and electric machine assembly bearing I 4 are fastenedly connected, and electric machine assembly bearing I 4 is fixedly connected with base plate 8; The worm screw I 5 be enclosed within on planetary gear reduction box I 3 output shafts is fixed by trip bolt, worm gear I 6 also is rigidly connected on accurate bidirectional ball-screw I 39 by trip bolt, and accurate bidirectional ball-screw I 39 is connected with base plate 8 by leading screw supporting seat I 7 with precision bearing; Stretching square nut I, II 27,43 are connected by sunk screw with the slide block of guide rail I 45 respectively, and guide rail I 45 is rigidly connected with base plate 8;
The assembly relation of the Power Component of described shearing load-on module, transmission and executive module is: drag cup rotor direct current generator II 10 is connected with planetary gear reduction box II 11, by worm-gears, with accurate bidirectional ball-screw II 30, be connected again, shearing square nut I, II 18,32 are rigidly connected by sunk screw with two-way ball-screw nut III, IV 47,49 respectively, and shear square nut I, II 18,32 by two side rails II, III 20,31 support guiding; Wherein, drag cup rotor direct current generator deceleration assembly and electric machine assembly bearing II 12 are fastenedly connected, and electric machine assembly bearing II 12 is fixedly connected with base plate 8; The worm screw II 13 be enclosed within on planetary gear reduction box II 11 output shafts is fixed by trip bolt, worm gear II 14 also is rigidly connected on accurate bidirectional ball-screw II 30 by trip bolt, and accurate bidirectional ball ball-screw II 30 is connected with base plate 8 by leading screw supporting seat II 15 with precision bearing; Shearing square nut I, II 18,32 are connected by sunk screw with the slide block of guide rail II, III 20,31 respectively, and guide rail II, III 20,31 are rigidly connected with base plate 8 respectively.
By above-mentioned what transmission link, the precision of direct current generator I, II 2,10 drive can be realized to deceleration to a great extent increase to turn round, guarantee that load is enough large and strain rate is enough low, finally meets the quasistatic loading requirement of test specimen.In addition by the supporting role of guide rail I, II, III 45,20,31, when guaranteeing stretching square nut I, II 27,43 and shearing square nut I, II 18,32 motion stressed steadily, can not produce and turn on one's side and the phenomenon of toppling because of the difference in height of standard specimen 38 stress points and two-way ball-screw I, II 39,30 stress points.
Described input and Control Component comprise photoelectric encoder I, II 1,9, power sensor I, II, III 24,19,33 and linear potentiometer I, II 44,41, can be used as the feedback sources of direct current generator I, II 2,10 Precision Pulses/direction closed loop control mode, and can realize the accurate detection of tensile load/displacement in the combined load test, shear-type load/displacement; Described photoelectric encoder I, II 1,9 coaxially are connected with direct current generator I, II 2,10 respectively; The power sensor I 24 of stretching load-on module is connected with fixture support frame I 25, the other end and power sensor fixed dam 23 are threaded connection, and use fastening nuts, the main body of linear potentiometer I 44 is fixed on stretching square nut II 43 by sunk screw, and the guide rod end of linear potentiometer I 44 contacts with potentiometer guide rod pressing plate I 21; The power sensor II of shearing load-on module, the two ends of III 19,33 are connected with cutting head I, II 22,29 and flexible hinge I, II 16,34 ends respectively, the main body of linear potentiometer II 41 is fixed in and is fastened on the potentiometer bracing frame 40 of shearing on square nut II 32 by sunk screw, and the guide rod end keeps in touch with the potentiometer guide rod pressing plate II 42 on the shearing square nut I 18 that is fixed on opposite side; The flexible direction that is subject to force direction, linear potentiometer I, II 44,41 of power sensor I, II, III 24,19,33 is consistent with the deformation direction of test specimen 38 under two kinds of loads, with synchronism and the accuracy of guaranteeing load/displacement signal.
Integrated Piezoelectric Driving assembly on described shearing load-on module, comprise piezoelectric stack I, II 17,35 and flexible hinge I, II 16,34, described piezoelectric stack I, II 17,35 are installed on respectively in the square groove of flexible hinge I, II 16,34, with cutting head I, II 22,29, keep coaxial; Flexible hinge I, II 16,34 are rigidly connected with shearing square nut I, II 18,32 respectively by sunk screw, and flexible hinge I, II 16,34 opposite sides are threaded connection with power sensor II, III 19,33 respectively.During 17,35 work of piezoelectric stack I, II all the time in pressured state, shear module stacks I in given stress level lower piezoelectric, II 17,35 has certain displacement and load fan-out capability, flexible hinge I, II 16,34 can guarantee, according to certain scale-up factor, the accurate shift reciprocately of piezoelectric stack I, II 17,35 outputs is passed to cutting head I, II 22,29 places, act on test specimen 38 and cut zone, simulation material bears the state of tired shear-type load, and wherein cutting head I, II 22,29 are made by the superhard alloy material.In addition, owing to having processing and rigging error, the cutting head I of both sides, II 22,29 exist and can not act on the possibility on test specimen 38 simultaneously, and at this moment the Piezoelectric Driving assembly can provide the micrometric displacement of shear module, guarantee that cutting head I, the II 22,29 of test specimen both sides acts on simultaneously.
Described clamping supporting component comprises fixture support frame I, II 25,37, fixture pressing plate I, II 26,36 and standard specimen 38, described fixture pressing plate I, II 26,36 are bolted with fixture support frame I, II 25,37 respectively, fixture support frame II 37 is rigidly connected by sunk screw and stretching square nut II 43, the fixture support frame I 25 of opposite side is supported on stretching square nut I 27 by cross slideway 28, the setting of intersection ball guide rail 28 can be moved along draw direction fixture support frame I 25, simultaneously can be fixed at shear direction.The surface of contact of fixture pressing plate I, II 26,36 and fixture support frame I, II 25,37 and test specimen 38 all is set to fine and close knurling structure, guarantees the firm clamping of test specimen 38.
The shear-type load of described shear module apply cutting head I by the test specimen both sides, II realizes, this mode of action is pure shear load, more approaches the actual military service situation of material, is convenient to test specimen 38 is carried out to force analysis.
Accurate bidirectional ball-screw I, II 39,30 that described stretching load-on module and the two-way linear of shearing load-on module move through two height alternative arrangement realize, this accurate bidirectional ball-screw I, II 39,30 are provided with two sections little helical pitch raceways that rotation direction is contrary; The middle part of test specimen 38 is also stressed concentrated zone, transmission by accurate bidirectional ball-screw I, II 39,30, the two-way ball-screw nut I of both sides, II, III, IV 46,48,47,49 can be moved by synchronous backward, can realize standard specimen 38 centres the most central in imaging region all the time in the process loaded, be convenient to real-time monitored and the record of imaging device.
Described stretching load-on module and shearing load-on module are realized drive load respectively, and the motion sequential is controlled, and test unit can be realized respectively extension test, pure shear test and the test of stretch-shearing combined load.
Under described stretching-shearing compound loading pattern, material Micro Mechanical Properties in-situ testing device structure is small and exquisite, can realize the article carrying platform compatibility with micro-imaging equipment such as metaloscopes, in the test sample mechanical property, sample is provided to the in-situ observation of mechanical behavior and failure mode.
Before implementing test, at first need power sensor I, II, III 24,19,33 to stretching module and shear module to be demarcated, utilize laser micrometer to be measured the rigidity of apparatus structure simultaneously, eliminating may affect the factor of measurement precision.In the preparation process of test specimen 38, for reaching desirable shearing test effect, can be to specimen prefabricated breach between the slight void of two cutting head I, II 22,29, and process the surface smoothness that obtains can be used for the high resolving power micro-imaging by single-sided polishing, or corrode the metallography microscope pattern that obtains the test specimen upper surface by chemical reagent, then test specimen 38 is placed between fixture support frame I, II 25,37 and fixture pressing plate I with knurling structure, II 26,36, tighten sunk screw, complete the clamping to test specimen 38.
Drive the motor of shear module, make the cutting head I of test specimen both sides, II 22,29 close, but form initial contact.Now device can be placed under the camera lens of microscopy apparatus, make the central part of test specimen 38 enter the most central of imaging region.Can select multiple load mode afterwards: tensile load, pure shear load, the highdensity plywood fatigue load, and can realize that above-mentioned load loads the mutual combination under sequential in difference.When applying shear-type load, there is certain error owing to processing and assembling, may there be the cutting head I of test specimen both sides, the situation that II 22,29 can not contact simultaneously, at this moment can utilize one-sided Piezoelectric Driving assembly output micro-displacement, effect when realizing cutting head I, II 22,29.
In test process, crackle produces, grows up and the microphenomenon such as extended mode can be by micro-imaging equipment Real-Time Monitorings such as optical microscopes, and obtains load/displacement, the stress/strain image of test in conjunction with the host computer debugging software.
Claims (6)
1. material Micro Mechanical Properties in-situ testing device under stretching-shearing compound loading pattern, it is characterized in that: comprise the stretching load-on module and shear load-on module two parts, the agent structure of stretching load-on module and shearing load-on module consists of Power Component, transmission and executive module, input and Control Component, clamping supporting component respectively;
The assembly relation of the Power Component of described stretching load-on module, transmission and executive module is: drag cup rotor direct current generator I (2) is connected with planetary gear reduction box I (3), by worm-gears, with accurate bidirectional ball-screw I (39), be connected again, stretching square nut I, II (27,43) are rigidly connected by sunk screw with two-way ball-screw nut I, II (46,48) respectively, and stretching square nut I, II (27,43) are supported guiding by two side rails I (45); Wherein, drag cup rotor direct current generator deceleration assembly and electric machine assembly bearing I (4) are fastenedly connected, and electric machine assembly bearing I (4) is fixedly connected with base plate (8); The worm screw I (5) be enclosed within on planetary gear reduction box I (3) output shaft is fixed by trip bolt, it is upper that worm gear I (6) also is rigidly connected in accurate bidirectional ball-screw I (39) by trip bolt, and accurate bidirectional ball-screw I (39) is connected with base plate (8) by leading screw supporting seat I (7) with precision bearing; Stretching square nut I, II (27,43) are connected by sunk screw with the slide block of guide rail I (45) respectively, and guide rail I (45) is rigidly connected with base plate (8);
The assembly relation of the Power Component of described shearing load-on module, transmission and executive module is: drag cup rotor direct current generator II (10) is connected with planetary gear reduction box II (11), by worm-gears, with accurate bidirectional ball-screw II (30), be connected again, shearing square nut I, II (18,32) are rigidly connected by sunk screw with two-way ball-screw nut III, IV (47,49) respectively, and shear square nut I, II (18,32) by two side rails II, III (20,31) support guiding; Wherein, drag cup rotor direct current generator deceleration assembly and electric machine assembly bearing II (12) are fastenedly connected, and electric machine assembly bearing II (12) is fixedly connected with base plate (8); The worm screw II (13) be enclosed within on planetary gear reduction box II (11) output shaft is fixed by trip bolt, it is upper that worm gear II (14) also is rigidly connected in accurate bidirectional ball-screw II (30) by trip bolt, and accurate bidirectional ball ball-screw II (30) is connected with base plate (8) by leading screw supporting seat II (15) with precision bearing; Shearing square nut I, II (18,32) are connected by sunk screw with the slide block of guide rail II, III (20,31) respectively, and guide rail II, III (20,31) are rigidly connected with base plate (8) respectively.
2. material Micro Mechanical Properties in-situ testing device under stretching according to claim 1-shearing compound loading pattern, it is characterized in that: described input and Control Component comprise photoelectric encoder I, II (1,9), power sensor I, II, III (24,19,33) and linear potentiometer I, II (44,41), can be used as the feedback sources of direct current generator I, II (2,10) Precision Pulse/direction closed loop control mode, and can realize the accurate detection of tensile load/displacement in the combined load test, shear-type load/displacement; Described photoelectric encoder I, II (1,9) respectively with direct current generator I, II (2,10) the coaxial connection; The power sensor I (24) of stretching load-on module is connected with fixture support frame I (25), the other end and power sensor fixed dam (23) are threaded connection, and use fastening nuts, it is upper that the main body of linear potentiometer I (44) is fixed in stretching square nut II (43) by sunk screw, and the guide rod end of linear potentiometer I (44) contacts with potentiometer guide rod pressing plate I (21); The power sensor II of shearing load-on module, the two ends of III (19,33) are connected with cutting head I, II (22,29) and flexible hinge I, II (16,34) end respectively, it is upper that the main body of linear potentiometer II (41) is fixed in by sunk screw the potentiometer bracing frame (40) be fastened on shearing square nut II (32), and the guide rod end keeps in touch with the potentiometer guide rod pressing plate II (42) on the shearing square nut I (18) that is fixed on opposite side; The flexible direction that is subject to force direction, linear potentiometer I, II (44,41) of power sensor I, II, III (24,19,33) is consistent with the deformation direction of test specimen (38) under two kinds of loads.
3. material Micro Mechanical Properties in-situ testing device under stretching according to claim 1-shearing compound loading pattern, it is characterized in that: integrated Piezoelectric Driving assembly on described shearing load-on module, comprise piezoelectric stack I, II (17,35) and flexible hinge I, II (16,34), described piezoelectric stack I, II (17,35) are installed on respectively in the square groove of flexible hinge I, II (16,34), with cutting head I, II (22,29), keep coaxial; Flexible hinge I, II (16,34) are rigidly connected with shearing square nut I, II (18,32) respectively by sunk screw, and flexible hinge I, II (16,34) opposite side are threaded connection with power sensor II, III (19,33) respectively.
4. material Micro Mechanical Properties in-situ testing device under stretching according to claim 1-shearing compound loading pattern, it is characterized in that: described clamping supporting component comprises fixture support frame I, II (25, 37), fixture pressing plate I, II (26, 36) and standard specimen (38), described fixture pressing plate I, II (26, 36) respectively with fixture support frame I, II (25, 37) be bolted, fixture support frame II (37) is rigidly connected by sunk screw and stretching square nut II (43), the fixture support frame I (25) of opposite side is supported on stretching square nut I (27) by cross slideway (28), fixture pressing plate I, II (26,36) and fixture support frame I, II (25,37) all are set to fine and close knurling structure with the surface of contact of test specimen (38), guarantee the firm clamping of test specimen (38).
5. material Micro Mechanical Properties in-situ testing device under stretching according to claim 1-shearing compound loading pattern, it is characterized in that: accurate bidirectional ball-screw I, II (39,30) that described stretching load-on module and the two-way linear of shearing load-on module move through two height alternative arrangement realize, this accurate bidirectional ball-screw I, II (39,30) are provided with two sections little helical pitch raceways that rotation direction is contrary; The middle part of test specimen (38) is also stressed concentrated zone, transmission by accurate bidirectional ball-screw I, II (39,30), the two-way ball-screw nut I of both sides, II, III, IV (46,48,47,49) can be moved by synchronous backward, can realize standard specimen (38) centre the most central in imaging region all the time in the process loaded, in favourable observation position.
6. according to material Micro Mechanical Properties in-situ testing device under the described stretching of any one in claim 1 to 5-shearing compound loading pattern, it is characterized in that: the article carrying platform compatibility of material Micro Mechanical Properties in-situ testing device and micro-imaging equipment under described stretching-shearing compound loading pattern.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335898A (en) * | 2013-06-03 | 2013-10-02 | 吉林大学 | In-situ testing device for micro-mechanical properties of materials under tension-shear combined loading mode |
| CN106404571A (en) * | 2016-11-18 | 2017-02-15 | 盐城工学院 | Bending fatigue test apparatus and test system |
| CN109781760A (en) * | 2018-12-27 | 2019-05-21 | 西安交通大学 | A kind of miniature multi-function in-situ test platform based on SEM Electronic Speculum |
-
2013
- 2013-06-03 CN CN2013203116871U patent/CN203337481U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335898A (en) * | 2013-06-03 | 2013-10-02 | 吉林大学 | In-situ testing device for micro-mechanical properties of materials under tension-shear combined loading mode |
| CN103335898B (en) * | 2013-06-03 | 2015-06-03 | 吉林大学 | In-situ testing device for micro-mechanical properties of materials under tension-shear combined loading mode |
| CN106404571A (en) * | 2016-11-18 | 2017-02-15 | 盐城工学院 | Bending fatigue test apparatus and test system |
| CN109781760A (en) * | 2018-12-27 | 2019-05-21 | 西安交通大学 | A kind of miniature multi-function in-situ test platform based on SEM Electronic Speculum |
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