CN203551372U - Platform for in situ testing micro mechanical properties of material in shearing-torsion composite load mode - Google Patents
Platform for in situ testing micro mechanical properties of material in shearing-torsion composite load mode Download PDFInfo
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- CN203551372U CN203551372U CN201320641301.3U CN201320641301U CN203551372U CN 203551372 U CN203551372 U CN 203551372U CN 201320641301 U CN201320641301 U CN 201320641301U CN 203551372 U CN203551372 U CN 203551372U
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Abstract
The utility model relates to a platform for in situ testing the micro mechanical properties of a material in a shearing-torsion composite load mode, and belongs to the field of precision scientific instruments. The platform consists of a precision shearing load driving unit, a precision torsion load driving unit, a mechanisms and deformation signal detection unit and a test piece clamping unit, can be used for testing the micro mechanical properties of the material under pure shearing and pure torsion single load actions separately, and can also be used for testing the micro mechanical properties of the material in the shearing-torsion composite load mode. The platform has the advantages of various functions, compact and light structure, functions of driving, loading, detecting and dynamically testing the multiple mechanical properties of the material, high compatibility with commercially-available common instruments such as scanning electron microscopes, optical microscopes (metallographic microscopes) and X-ray diffractometers, and can be used for dynamically researching a correlation rule between the microstructure of the material and a deformation damage mechanism under the actions of different loads in combination with a representative instrument for use in a performance test of the type of material.
Description
Technical field
The utility model belongs to exact science instrument class, particularly a kind of shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform.The single load action material Micro Mechanical Properties test platform that can be used as pure shear or pure torsion is independently used, also can realize the shear loads material Micro Mechanical Properties test under the test of torsional load action material Micro Mechanical Properties under given shear stress level or given torsional moment state, i.e. the material Micro Mechanical Properties of combined load loading mode test.In addition, this platform can under the in-situ monitoring of the instruments such as scanning electron microscope, optical microscope (metaloscope), X-ray diffractometer, comprise the material Micro Mechanical Properties test of original position shear-type load loading mode, the material Micro Mechanical Properties test that the material Micro Mechanical Properties of original position torsional load loading mode is tested, original position shear-is reversed compound loading pattern is carried out Real Time Observation thereby realize to the Micromechanics behavior of measured material and sex change damage process.Simultaneously, by the closed-loop control to driver element, mechanics and deformation signal detecting unit to shearing the shear pressure of load driver unit, the collection of linear displacement signal and mechanics and deformation signal detecting unit to reversing the moment of torsion of load driver unit, the collection of angular displacement signal, also can matching measured material in the ess-strain course of shearing-reversing under compound action, for the Micro Mechanical Properties test of material under combined load loading mode provides method.
Background technology
In-situ nano mechanical test refers under nanoscale material for test is carried out in Mechanics Performance Testing process, a kind of mechanical test technology that omnidistance dynamic monitoring is carried out in microdeformation damage material under load being occurred by instruments such as electron microscope, atomic force microscope or optical microscopes.The announcement that this technology is deep various types of materials and Micromechanics behavior, micromechanism of damage and the material property thereof of goods and the correlativity rule between suffered load.At present, in order to measure the important parameter such as elastic modulus, hardness, break limit, shear modulus of material and goods thereof, based on nanometer mechanics test, various test has been proposed, as stretching/compressing method, shearing method, torsional technique, bending method and Using Nanoindentation etc.But under actual condition, the loading that material and goods thereof are subject to is often non-single-mode, as stretching/compressing-crooked combined load pattern, stretching/compressing-torsion combined load pattern, shearing-torsion composite mode etc.Relative single-mode, the reason of the material of working under combined load pattern and the stressing conditions of member, distortion, damage inactivation is also more complicated.Therefore, adopt mechanical measuring and calculation method for single load form to be difficult to accurately express the loading of material and member under actual condition, cannot make accurate evaluation to the mechanical property of material under Action of Combined Loads.
Therefore, for to material and goods thereof mechanical property and the sex change damage mechanism under combined load model function make accurate evaluation, the parsing of realization to different single load patterns, simultaneously, realization is to two or more load modes independent loads or loading successively, invented the in-situ test platform of multiple load composite mode, press-bending combined load type material Mechanics Performance Testing device as drop-down in microscope etc.
This shear-reverses compound loading type material Micro Mechanical Properties in-situ test platform, as can intuitively reflecting one of effective evaluation hand of material mechanical performance, can directly obtain as important mechanics parameters such as shear moduluses, combined load loading mode based on shearing, reverse two kinds of single load forms is also comparatively general in actual condition, and is often one of reason causing material and goods failure damage thereof.Under micro-scale, material for test is carried out in original position Micro Mechanical Properties test process, the process of the microdeformation that can occur test specimen under load by Image-forming instruments such as scanning electron microscope, damage, failure damage is carried out omnidistance dynamic monitoring.By this mechanical test means, can disclose under external load function, the rule of material deformation damage, and can avoid because the puzzlement that the problems such as size effect of micro-member are brought, by being more conducive to research material and goods thereof, the true Micromechanics behavior under state is machine-processed with deformation damage under arms for this.
In sum, design a kind of test platform of the material Micro Mechanical Properties in-situ test that can be used for pure shear load loading mode under microscope, pure torsional load loading mode and shearing-torsion compound loading pattern very necessary.
Summary of the invention
The purpose of this utility model is to design a kind of shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform, can realize the material Micro Mechanical Properties in-situ test of pure shear load loading mode, pure torsional load loading mode and the shearing-torsion compound loading pattern based on above two kinds of load modes, wherein, under combined load loading mode, the force-bearing situation of test specimen more approaches the loading in composite of material under actual condition.This test platform architecture is little, quality is light, can be by imaging systems such as scanning electron microscope, optical microscope (metaloscope), X-ray diffractometers, above-mentioned test process is carried out to Real Time Observation, as the failure fracture process to the crack initiation of material, Crack Extension and material is carried out in-situ monitoring, and then Micromechanics behavior, the deformation damage mechanism under single load pattern and combined load pattern loading effect is furtherd investigate to material.Meanwhile, by the collection to the closed-loop control of driver element and load/displacement signal, also can the ess-strain course of matching material under the effect of combined load loading mode, for the material Micro Mechanical Properties in-situ test of combined load loading mode provides method.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
Shear-reverse compound loading type material Micro Mechanical Properties in-situ test platform, comprise accurate-shearing load driver unit, accurate load driver unit, mechanics and deformation signal detecting unit, the test specimen grip unit etc. reversed, accurate-shearing load driver unit and accurate torsion load driver unit are bolted on test platform pedestal 1, guarantee that the traveling priority direction of accurate-shearing load driver unit terminal output is perpendicular with the axis rotatablely moving of accurate torsion load driver unit terminal output; Test specimen grip unit coordinates the accurate load driver unit that reverses to realize test specimen fixed, clamps and apply moment of torsion, each components and parts of mechanics and deformation signal detecting unit are distributed in accurate-shearing load driver unit, accurate torsion in load driver unit, to realize function separately.Wherein, the motion sequential of accurate-shearing load driver unit, accurate torsion load driver unit is controlled, and difference drive; Be the single load action material Micro Mechanical Properties test that test platform can carry out respectively pure shear and pure torsion, particularly can shear-reverse the material Micro Mechanical Properties test of compound loading pattern.
Described accurate-shearing load driver unit is: installed the DC servo motor I 15 of scrambler I 14 with by speed reduction unit 16, Timing Belt 18, synchronous pulley I 20, and the gear unit I that accurate bidirectional ball-screw 7 forms is connected, DC servo motor I 15 is with the output precision corner displacement of pulse/reversing mode and controllable torque, by the speed reduction unit I 16 being connected with DC servo motor I 15, Timing Belt 18, rotatablely moving that the gear unit I of the compositions such as synchronous pulley I 20 and accurate bidirectional ball-screw 7 provides DC servo motor I 15 converts rectilinear motion to, DC servo motor I 15 is connected with test platform pedestal 1 by flange frame I 17, accurate bidirectional ball-screw 7 is connected with test platform pedestal 1 by leading screw fixed pedestal I, II 3,21,
The described accurate load driver unit that reverses is: installed the DC servo motor II 34 of scrambler II 35 with by speed reduction unit II 33, worm gear 30, the gear unit II that worm screw 31 forms is connected, DC servo motor II 34 is with the output precision corner displacement of pulse/reversing mode and controllable torque, by the speed reduction unit II 33 being connected with DC servo motor 34, worm screw 31, rotatablely moving that the gear unit II of the compositions such as worm gear 30 provides DC servo motor II 34 passes to clamp body II 27, DC servo motor II 34 is connected with test platform pedestal 1 by flange frame II 32, described worm screw 31 is connected with speed reduction unit II 33 screws, turbine 30 is connected with clamp body II 27 screws, clamp body II 27 is by bearing I 29, supporting base I 28 is connected with test platform pedestal 1.
The mechanical signal detecting unit that described mechanics and deformation signal detecting unit are comprised of pressure transducer I, II 2,23 and torque sensor 11, the displacement signal detecting unit being formed by grating angular displacement sensor 25, linear displacement transducer 44, and scrambler I, II 14,35 forms, respectively in order to detect load---shearing force, the moment of torsion that in combined load test, test specimen is subject to, and the deflection that produces of test specimen---shear the degree of depth and windup-degree; One end of described pressure transducer II 23 is connected with pressure transducer pedestal I 24, and the other end is connected with pressure head II 22; One end of pressure transducer I 2 is connected with pressure transducer pedestal II 36, and the other end is connected with pressure head I 6; One end of torque sensor 11 is connected with torque sensor pedestal 12, and the other end is connected with the clamp body I 10 of test specimen grip unit; The two ends of linear displacement transducer 44 are connected respectively in feed screw nut support I in rail plate I 5, II 4,19; Grating angular displacement sensor 25 is directly connected with test specimen 8; Described scrambler I 14 is connected with the rotor coaxial of DC servo motor I 15, and scrambler II 35 is connected with the rotor coaxial of DC servo motor II 34.The value of angular displacement that adopts grating angular displacement sensor (25) to measure converts and obtains the anglec of rotation in test specimen effective length.
Described pressure transducer I, II 2,23 and scrambler I 14 can be respectively demarcated distortion digital signal by load simulated signal and scrambler provides the feedback sources of Precision Pulse/direction closed loop control mode for DC servo motor I 15; Torque sensor 11 and scrambler II 35 can be respectively demarcated distortion digital signal by load simulated signal and scrambler provides the feedback sources of Precision Pulse/direction closed loop control mode for DC servo motor II 34.
Described grip unit is comprised of clamp body II 27, supporting base II 50, supporting base III 52 and clamp body I 10, wherein supporting base II 50 is rigidly connected by hexagon socket head cap screw with test platform pedestal 1, and supporting base III 52 is connected with glide base 55 by hexagon socket head cap screw; Between clamp body I, II 10,27 and test specimen 8 by screw location, clamping and transmitting torque.Clamp body I 10 is connected with torque sensor 11 by bolt, by two pairs of screws, test specimen 8 is fixed, is clamped, and this clamp body only can move along test specimen axial direction, cannot rotate, and by supporting base III 52, is fixed on glide base 55; Clamp body II 27 is also fixed, clamps test specimen 8 by two pairs of screws, and by its rotation, test specimen is applied to moment of torsion, by bearing I 29, bearing seat I 28, is connected with test platform pedestal 1.Rail plate II 13 provides support and the effect of leading for glide base 55, guarantee in reversing the process of test, glide base 55 drives and comprises that torque sensor pedestal 12 and clamp body I 10 etc. axially adjust automatically along test specimen, in adaptive testing process, test specimen is in the variation of this direction size.
Described speed reduction unit I 16 and precision ball screw 7 are connected with synchronous pulley I, II 48,20 respectively by key.
The rotation adjusting knob I of described accurate-shearing load driver unit, II 9,26 are connected with pressure transducer pedestal II, I 36,24 respectively, described pressure transducer pedestal II, I 36,24 are slidably connected with guide rail V, IV 58,46 respectively, accurate-shearing load driver unit is by rotation adjusting knob I, II 9,26, can make pressure transducer pedestal II, I 36,24 along guide rail V, IV 58,46, move respectively, thereby two clipped position of shearing pressure head I, II 6,22 that are connected in pressure transducer pedestal II, I 36,24 are adjusted.
Described accurate bidirectional ball-screw 7 is provided with two sections of little helical pitch raceways that helical pitch is identical, rotation direction is contrary, to guarantee in shearing test process, feed screw nut pedestal I, the II 4,19 connecting with feed screw nut drives respectively shears pressure head I, II 6,22 with identical speed move toward one another.Meanwhile, guide rail slide block I 42 grades are close on precise guide rail track by dovetail grooved mechanism, and rigidly connected with ball-screw nut pedestal I, II 4,19 respectively, and accurate guide effect is played in the to-and-fro movement that accurate bidirectional ball guide screw nat is exported.
Test platform size of main body described in the utility model is 235mm * 185.5mm * 82.5mm, can be installed on the instruments such as scanning electron microscope, optical microscope (metaloscope), X-ray diffractometer, all there is good structure compatible with main flow high resolving power micro-imaging assembly.
The beneficial effects of the utility model are: compared with prior art, the utility model can be realized shearing simultaneously, reverses two kinds of load loading mode independent loads or load successively, not only can realize shearing and reverse the parsing of single load loading mode, can also in Micro Mechanical Properties and the sex change damage mechanism shearing-reverse under compound loading model function, make accurate evaluation with regard to material and goods thereof.Test material scope is wide, and content measurement is abundant, comprises that the biomaterials such as metal material, pottery, non-crystaline amorphous metal and bone are all within can survey scope.This test platform architecture is little simultaneously, quality is light, can be by as Image-forming instruments such as surface sweeping electron microscope, optical microscope (metaloscope), X-ray diffractometers, the heterogeneous microstructure of measured material, Micromechanics behavior and sex change damage process are carried out to Real Time Observation, realize in-situ test.In addition, the combination that components and parts were measured, controlled to load transducer, grating angular displacement sensor and scrambler etc., can realize the accurate closed-loop control to this in-situ test platform.In sum, the utility model not only has good application, DEVELOPMENT PROSPECT, and the development important in inhibiting to in-situ testing technique and device.
Accompanying drawing explanation
Fig. 1 is overall appearance structural representation of the present utility model;
Fig. 2 is accurate-shearing load driver cellular construction schematic diagram of the present utility model;
Fig. 3 is the accurate load driver cellular construction schematic diagram that reverses of the present utility model;
Fig. 4 be accurate-shearing load driver of the present utility model unit to view;
Structural representation when Fig. 5 is test specimen grip unit clamping test pieces of the present utility model.
In figure: 1, test platform pedestal; 2, pressure transducer I; 3, leading screw fixed pedestal I; 4, feed screw nut support I; 5, rail plate I; 6, pressure head I; 7, accurate bidirectional ball-screw; 8, test specimen; 9, adjusting knob I; 10, clamp body I; 11, torque sensor; 12, torque sensor pedestal; 13, rail plate II; 14, scrambler I; 15, DC servo motor I; 16, speed reduction unit I; 17, flange frame I; 18, Timing Belt; 19, feed screw nut support II; 20, synchronous pulley I; 21, leading screw fixed pedestal II; 22, pressure head II; 23, pressure transducer II; 24, pressure transducer pedestal I; 25, grating angular displacement sensor; 26, adjusting knob II; 27, clamp body II; 28, supporting base I; 29, bearing I; 30, worm gear; 31, worm screw; 32, flange frame II; 33, speed reduction unit II; 34, DC servo motor II; 35, scrambler II; 36, pressure transducer pedestal II; 37, bearing II; 38, precision lead screw nut; 39, knob base I; 40, bearing III; 41, spring; 42, slide block I; 43, knob base II; 44, linear displacement transducer; 45, rail plate III; 46, rail plate IV; 47, slide block II; 48, synchronous pulley II; 49, rail plate VI; 50, supporting base II; 51, bearing V; 52, supporting base III; 53, bearing VI; 54, slide block III; 55, glide base; 56, slide block IV; 57, slide block V; 58, rail plate V.
Embodiment
Below in conjunction with accompanying drawing, further illustrate detailed content of the present utility model and embodiment thereof.
Referring to Fig. 1 to Fig. 5, shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform of invention, comprise accurate-shearing load driver unit, accurate load driver unit, mechanics and deformation signal detecting unit, the test specimen grip unit reversed, accurate-shearing load driver unit and accurate torsion load driver unit are bolted on test platform pedestal 1, guarantee that the traveling priority direction of accurate-shearing load driver unit terminal output is perpendicular with the axis rotatablely moving of accurate torsion load driver unit terminal output; Test specimen grip unit coordinates the accurate load driver unit that reverses to realize test specimen fixed, clamps and apply moment of torsion, each components and parts of mechanics and deformation signal detecting unit are distributed in accurate-shearing load driver unit, accurate torsion in load driver unit, to realize function separately.Wherein, the motion sequential of accurate-shearing load driver unit, accurate torsion load driver unit is controlled, and difference drive; Be the single load action material Micro Mechanical Properties test that test platform can carry out respectively pure shear and pure torsion, particularly can shear-reverse the material Micro Mechanical Properties test of compound loading pattern.
Described accurate-shearing load driver unit is: DC servo motor I 15 is installed after scrambler I 14, with speed reduction unit I 16, Timing Belt 18, the gear unit that synchronous pulley I 20 and accurate bidirectional ball-screw 7 form is connected, DC servo motor I 15 is with the output precision corner displacement of pulse/reversing mode and controllable torque, by the speed reduction unit I 16 being connected with DC servo motor I 15, Timing Belt 18, rotatablely moving that the gear unit of the compositions such as synchronous pulley I 20 and accurate bidirectional ball-screw 7 provides DC servo motor I 15 converts rectilinear motion to, DC servo motor I 15 is connected with test platform pedestal 1 by flange frame I 17, precision ball screw 7 two ends are respectively by bearing II, III 37,40, and leading screw fixed pedestal I, II 3,21 are connected with test platform pedestal 1.Precision lead screw nut 38 forms ball guide screw nat together with ball-screw 7, and precision lead screw nut 38 is installed in feed screw nut support I 4.
The described accurate load driver unit that reverses is: DC servo motor II 34 is installed after scrambler II 35, the gear unit II forming with speed reduction unit II 33, worm screw 31, worm gear 30 is connected, DC servo motor II 34 is with the output precision corner displacement of pulse/reversing mode and controllable torque, rotatablely moving that the gear unit II of the compositions such as the speed reduction unit II 33 by being connected with DC servo motor II 34, worm screw 31, worm gear 30 provides DC servo motor II 34 passes to clamp body II 27, and DC servo motor II 34 is connected with test platform pedestal 1 by flange frame II 32; Described worm screw 31 is connected with speed reduction unit II 33 screws, and turbine 30 is connected with clamp body II 27 screws, and clamp body II 27 is connected with test platform pedestal 1 by bearing I 29, supporting base I 28.
Described mechanics and deformation signal detecting unit comprise the mechanical signal detecting unit that pressure transducer I, II 2,23, torque sensor 11 form, the deformation signal detecting unit that grating angular displacement sensor 25, linear displacement transducer 44 forms, and scrambler I, II 14,35.Pressure transducer I, II 2, 23 in order to detect the suffered shear stress of test specimen 8 in the material Micro Mechanical Properties test of pure shear load loading mode and shearing-torsion compound loading pattern, torque sensor 11 is in order to detect the suffered moment of torsion of test specimen 8 in the material Micro Mechanical Properties test of pure torsional load loading mode and shearing-torsion compound loading pattern, grating angular displacement sensor 25 is in order to detect the windup-degree of test specimen 8 in the material Micro Mechanical Properties test of pure torsional load loading mode and shearing-torsion compound loading pattern, linear displacement transducer 44 is in order to detect the shearing degree of depth of shearing pressure head in the material Micro Mechanical Properties test of pure shear load loading mode and shearing-torsion compound loading pattern.Meanwhile, pressure transducer I, II 2,23, linear displacement transducer 44 and scrambler 14 be by the conversion of simulating signal and digital signal, thereby DC servo motor I 15 is realized to accurate closed-loop control; Torque sensor 11, grating angular displacement sensor 25 and scrambler II 35 be by the conversion of simulating signal and digital signal, for DC servo motor II 34 provides the feedback sources of Precision Pulse/direction closed loop control mode; One end of pressure transducer II 23 is connected with pressure transducer pedestal I 24, and the other end is connected with shearing pressure head II 22; One end of pressure transducer I 2 is connected with pressure transducer pedestal II 36, and the other end is connected with shearing pressure head I 6; One end of torque sensor 11 is connected with torque sensor pedestal 12, and the other end is connected with the clamp body I 10 of test specimen grip unit; The two ends of linear displacement transducer 44 are connected respectively in rail plate I 5, rail plate III 45 in the feed screw nut support I corresponding with two precision lead screw nuts, II 4,19; Grating angular displacement sensor 25 is directly connected with test specimen 8.Described scrambler I 14 is connected with the rotor coaxial of DC servo motor I 15, and scrambler II 35 is connected with the rotor coaxial of DC servo motor II 34.
Described grip unit is comprised of clamp body II 27, supporting base II 50, supporting base III 52 and clamp body I 10, wherein supporting base II 50 is rigidly connected by hexagon socket head cap screw with test platform pedestal 1, and supporting base III 52 is connected with glide base 55 by hexagon socket head cap screw; Between clamp body I, II 10,27 and test specimen 8 by screw location, clamping and transmitting torque.Clamp body I 10 is connected with torque sensor 11 by bolt, by two pairs of screws, test specimen 8 is fixed, is clamped, and this clamp body only can move along test specimen axial direction, cannot rotate, and by supporting base III 52, is fixed on glide base 55; Clamp body II 27 is also fixed, clamps test specimen 8 by two pairs of screws, and by its rotation, test specimen is applied to moment of torsion, by bearing I, bearing V, bearing VI 29,51,53 and supporting base I, II, III 28,50,52, be connected with test platform pedestal 1.Rail plate II 13 provides support and the effect of leading for glide base 55, guarantee in reversing the process of test, glide base 55 drives and comprises that torque sensor pedestal 12 and clamp body I 10 etc. axially adjust automatically along test specimen, in adaptive testing process, test specimen is in the variation of this direction size.
Motion and transmission of power are realized by toothed belt transmission in described accurate-shearing load driver unit, and wherein synchronous pulley II, I 20,48 are connected with the output shaft of speed reduction unit I 16 with accurate bidirectional ball-screw 7 respectively by key.
It is identical that described accurate bidirectional ball-screw 7 is provided with two sections of helical pitches, the little helical pitch raceway that rotation direction is contrary, again due to pressure head I, II 6, 22, pressure transducer I, II 2, 23, sensor base II, I 36, 24 parts such as grade or components and parts full symmetric, make when 7 work of accurate bidirectional ball-screw, pressure head I, II 6, 22 with identical speed move toward one another, be that in test process, clipped position remains unchanged, to guarantee in shearing test process, the feed screw nut support I being connected with feed screw nut, II 4, 19 are with respectively dynamic head I, II 6, 22 with identical speed move toward one another.Meanwhile, slide block I 42 grades are close on precise guide rail track by dovetail grooved mechanism, and rigidly connected with ball-screw nut support I, II 4,19 respectively, and accurate guide effect is played in the to-and-fro movement that accurate bidirectional ball guide screw nat is exported.
In described shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform, rotation adjusting knob I, II 9, 26, can be by being fixed on pressure transducer pedestal II, I 36, knob base II on 24, I 43, 39 make pressure transducer pedestal II, I 36, 24 respectively by slide block V, II 57, 47 along rail plate V, IV 58, 46 tangential movements, drive and shear pressure head 22 and 6 along test specimen axially-movable, thereby adjust, shear pressure head I, II 6, 22 cutting into position, under pressure transducer pedestal, respectively there are two with the spring spring 41, be used for guaranteeing to adjust the stability of the pressure transducer pedestal after rotation adjusting knob.
In described shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform, the accurate load driver unit that reverses is driven by DC servo motor II, I 34,15 respectively with the accurate load driver unit that reverses, the motion sequential of these two unit is controlled and separate, so this test platform can be realized respectively the material Micro Mechanical Properties in-situ test of pure shear load loading mode, pure torsional load loading mode and shearing-torsion compound loading pattern.
Described clamp body I 10 is connected with torque sensor pedestal 12 by torque sensor 11, torque sensor pedestal 12 and supporting base III 52 are connected to glide base 55 jointly, this glide base is rigidly connected by hexagonal socket nut and slide block III, IV 54,56 etc., in precision, reverse in the process of test, this glide base 55 moves horizontally by the slide block in rail plate II, VI 13,49, to adapt to the variation of test specimen axial dimension.
Described test platform size of main body is 235mm * 185.5mm * 82.5mm, can install on the instruments such as scanning electron microscope, optical microscope (metaloscope), X-ray diffractometer, all there is good structure compatible with main flow high resolving power micro-imaging assembly, therefore, can carry out online Real Time Observation to the mechanical property in-situ test of above-mentioned three kinds of patterns, and then Micromechanics behavior and the deformation damage mechanism under single load loading mode and the effect of combined load loading mode is furtherd investigate to material.
Referring to Fig. 1 to Fig. 5, in shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform of invention, install before test specimen, need to carry out reset operation to clamp body I, II 10,27, require the screw horizontal distribution for fixing, clamping after resetting, so that the carrying out of subsequent operation.Before implementing test, need to be to pressure transducer I, the II 2,23 for the test of pure shear load loading mode and the test of shearing-torsion compound loading pattern, and demarcate test for the torque sensor 11 of pure torsional load loading mode test and the test of shear-torsion compound loading pattern, utilize laser micrometer to testing in the elastic deformation value of certain load lower sensor simultaneously, be convenient to the deflection of the test of torsional load loading mode and the lower test specimen of shearing-torsion compound loading pattern test to calculate.
For the material Micro Mechanical Properties test of shearing-reversing compound loading pattern, different according to the loading sequence of two kinds of load, can be divided into following three kinds of patterns: pattern one, in shearing test, is reversed test; Pattern two is after torsion has been tested, then carries out shearing test, realizes the shearing test under existing distorting stress state; Another pattern is after shearing test completes, then reverses test, realizes the torsion test under existing shear state.
Because needs carry out Real Time Observation to test, therefore for for ease of micro imaging system to the observation of test specimen 8 and image acquisition, need to grind to test specimen part surface the surface treatment of other modes, to obtain higher surface accuracy.Also can obtain by techniques such as chemical corrosions the microstructures such as metallographic of test specimen, to test process is observed and result is analyzed.
For three kinds of above-mentioned test patterns, the test process of pattern one can be analyzed as follows: given scrambler II 35 is demarcated speed as the constant strain rate of test specimen 8, this strain rate scope is 0.5um/s to 50um/s, or using the constant loading rate that analog signals that torque sensor 11 provides provides as feedback sources, the accurate angular displacement of DC servo motor II 34 output under the control of pulse signal, by speed reduction unit II 33, the deceleration of worm screw 31 and worm gear 30 increases to be turned round, rotatablely moving of motor output is delivered in clamp body II 27, simultaneously, 35 pairs of torque T of torque sensor 11 and scrambler II detect and the rotating speed of clamp body II 27 synchronously picks up.Under any stress level of torsional load loading mode test, with pulse mode, drive linear electric motors I 15 output precision linear displacements, carry out independently shearing test, until micro-imaging assembly observes initial crack source and germinating or failure damage phenomenon.Meanwhile, as previously mentioned, by the demarcation of carrying out in the elastic deformation value of certain load lower sensor is tested, also indirect calculation goes out the strain value of test specimen under shearing and twisting action comparatively accurately.The test process of two other pattern similarly.
In the whole process of test, the crack initiation of test specimen, expansion and deformation damage situation are carried out dynamic monitoring by the scanning electron microscope imaging system of high magnification, and document image simultaneously, the important mechanics parameters such as engineering stress strain curve that also can Real-time Obtaining exosyndrome material mechanical property in conjunction with debugging software and bending strength, tensile strength.
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 multiple change and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in the protection domain of invention.
Claims (9)
1. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform, it is characterized in that: comprise accurate-shearing load driver unit, accurate load driver unit, mechanics and deformation signal detecting unit, the test specimen grip unit reversed, accurate-shearing load driver unit and the accurate load driver unit that reverses are bolted on test platform pedestal (1) above, guarantee that the traveling priority direction of accurate-shearing load driver unit terminal output is perpendicular with the axis rotatablely moving of accurate torsion load driver unit terminal output; Test specimen grip unit coordinates the accurate load driver unit that reverses to realize test specimen fixed, clamps and apply moment of torsion, each components and parts of mechanics and deformation signal detecting unit are distributed in accurate-shearing load driver unit, accurate torsion in load driver unit, to realize function separately; Wherein, the motion sequential of accurate-shearing load driver unit, accurate torsion load driver unit is controlled, and difference drive; Be the single load action material Micro Mechanical Properties test that test platform can carry out respectively pure shear and pure torsion, can shear-reverse the material Micro Mechanical Properties test of compound loading pattern.
2. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform according to claim 1, it is characterized in that: described accurate-shearing load driver unit is: DC servo motor I (15) is installed after scrambler I (14), the gear unit I forming with speed reduction unit I (16), Timing Belt (18), synchronous pulley I (20) and accurate bidirectional ball-screw (7) is connected, and DC servo motor I (15) is connected with test platform pedestal (1) by flange frame I (17); Accurate bidirectional ball-screw (7) is connected with test platform pedestal (1) by leading screw fixed pedestal I, II (3,21).
3. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform according to claim 1, it is characterized in that: the described accurate load driver unit that reverses is: DC servo motor II (34) is installed after scrambler II (35), with speed reduction unit II (33), worm screw (31), the gear unit II that worm gear (30) forms is connected, DC servo motor II (34) is connected with test platform pedestal (1) by flange frame II (32), described worm screw (31) is connected by screw with speed reduction unit II (33), turbine (30) is connected by screw with clamp body II (27), clamp body II (27) is by bearing I (29), supporting base I (28) is connected with test platform pedestal (1).
4. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform according to claim 1, it is characterized in that: described mechanics and deformation signal detecting unit are by pressure transducer I, II (2, 23) and the load signal detecting unit that forms of torque sensor (11), grating angular displacement sensor (25), the displacement signal detecting unit that linear displacement transducer (44) forms, scrambler I, II (14, 35) form, one end of pressure transducer II (23) is connected with pressure transducer pedestal I (24), the other end is connected with shearing pressure head II (22), one end of pressure transducer I (2) is connected with pressure transducer pedestal II (36), and the other end is connected with shearing pressure head I (6), one end of torque sensor (11) is connected with torque sensor pedestal (12), and the other end is connected with the clamp body I (10) of test specimen grip unit, the two ends of linear displacement transducer (44) are connected respectively in feed screw nut support I in rail plate I (5), II (4,19), grating angular displacement sensor (25) is directly connected with test specimen (8), described scrambler I (14) is connected with the rotor coaxial of DC servo motor I (15), and scrambler II (35) is connected with the rotor coaxial of DC servo motor II (34).
5. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform according to claim 1, is characterized in that: the clamp body I (10) of described test specimen grip unit is connected with torque sensor (11) by bolt; Clamp body II (27) is connected with test platform pedestal (1) by bearing I (29), bearing seat I (28), between described clamp body I, II (10,27) and test specimen (8) by screw fix, clamping and transmitting torque.
6. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform according to claim 2, it is characterized in that: the rotation adjusting knob I of described accurate-shearing load driver unit, II (9, 26) respectively with pressure transducer pedestal II, I (36, 24) connect, described pressure transducer pedestal II, I (36, 24) respectively with guide rail V, IV (58, 46) be slidably connected, accurate-shearing load driver unit is by rotation adjusting knob I, II (9, 26), can make pressure transducer pedestal II, I (36, 24) respectively along guide rail V, IV (58, 46) mobile, thereby to being connected to pressure transducer pedestal II, I (36, 24) shear pressure head I for two on, II (6, 22) clipped position is adjusted, speed reduction unit I (16) and precision ball screw (7) are connected with synchronous pulley II, I (48,20) respectively by key, accurate bidirectional ball-screw (7) is provided with two sections of little helical pitch raceways that rotation direction is contrary.
7. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform according to claim 3, is characterized in that: between described worm screw (31) and speed reduction unit II (33), be all connected by screw between turbine (30) and clamp body II (27).
8. shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform according to claim 4, is characterized in that: the value of angular displacement that adopts grating angular displacement sensor (25) to measure converts and obtains the anglec of rotation in test specimen effective length.
9. according to the shearing-torsion compound loading type material Micro Mechanical Properties in-situ test platform described in any one in claim 1 to 9, it is characterized in that: described shearing-torsion compound loading type material Micro Mechanical Properties in-situ test main platform body is of a size of 235mm * 185.5mm * 82.5mm.
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