CN117074210A - Pure bending tester for microscale material - Google Patents

Pure bending tester for microscale material Download PDF

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Publication number
CN117074210A
CN117074210A CN202310972158.4A CN202310972158A CN117074210A CN 117074210 A CN117074210 A CN 117074210A CN 202310972158 A CN202310972158 A CN 202310972158A CN 117074210 A CN117074210 A CN 117074210A
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CN
China
Prior art keywords
flexible pivot
sample
target
pivot
deflection angle
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Pending
Application number
CN202310972158.4A
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Chinese (zh)
Inventor
刘大彪
胡炯炯
张磊
胡鹏
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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Filing date
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Application filed by Huazhong University of Science and Technology filed Critical Huazhong University of Science and Technology
Priority to CN202310972158.4A priority Critical patent/CN117074210A/en
Publication of CN117074210A publication Critical patent/CN117074210A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks

Abstract

The invention discloses a micro-scale material pure bending tester, which belongs to the field of pure bending measurement, wherein a rotating chuck rotating around a rotating motor is used for clamping one end of a sample, a fixed chuck is used for clamping the other end of the sample, and a bending moment is applied to the sample through the rotating motor, namely, when the rotating chuck rotates around the motor, the sample is subjected to bending deformation, and the bending moment is transmitted to a flexible pivot through the fixed chuck to be twisted, so that the bending moment can be obtained according to the rigidity coefficient of the flexible pivot and the deflection angle of the flexible pivot measured by a measuring unit. Compared with the existing bending moment sensor, the measuring unit is simple to assemble, the flexible pivot is less affected by environments such as temperature and humidity, the measuring unit can be used in various environments and occasions, and the universality is good. The rotary stepping motor is adopted to carry out pure bending loading on the standard sample, the movement track is simple, the control is more convenient, the tester has simple structure, the manufacturing process difficulty is reduced, and the testing precision is high.

Description

Pure bending tester for microscale material
Technical Field
The invention belongs to the field of pure bending measurement, and particularly relates to a micro-scale material pure bending tester.
Background
Pure bending means that the sample has only bending moment and no shearing force on the cross section when bending deformation occurs. At present, the most applied pure bending test method is a four-point bending test, but the method is only suitable for high-rigidity and small-deformation materials, and meanwhile, the requirements of test conditions cannot be met because the problems of stress concentration, fracture, contact surface friction and the like are easy to occur. The standard size of the test fabric sample of the Japanese KES-FB2 device is 20 x 1cm, the micro-scale sample with the diameter or thickness of micron order cannot be studied, and the test precision is low.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a micro-scale material pure bending tester, thereby solving the technical problems that the prior bending tester is difficult to realize the measurement of micro-scale samples with the diameter or thickness of micron, has low measurement precision, complex process and the like.
To achieve the above object, according to a first aspect of the present invention, there is provided a micro-scale material pure bending tester, comprising: the device comprises a base, a support, a fixed chuck, a rotating motor, a measuring module and a processing module;
the rotating motor is arranged in the base, and the support is connected with the base;
the fixed chuck is used for clamping one end of a sample; the rotary chuck is used for clamping the other end of the sample, is connected with the output end of the rotary motor through a rotating arm and moves circularly around the rotary motor under the drive of the rotary motor so as to enable the sample to generate pure bending deformation;
the measuring module comprises a measuring unit, an upper flexible pivot and a lower flexible pivot, wherein the rigidity coefficients of the upper flexible pivot and the lower flexible pivot are the same; the upper end of the upper flexible pivot and the lower end of the lower flexible pivot are respectively connected with the upper end and the lower end of the support, the upper flexible pivot, the fixed chuck and the lower flexible pivot are coaxially connected from top to bottom, and when the sample is subjected to pure bending deformation, bending moment is respectively transmitted to the lower end of the upper flexible pivot and the upper end of the lower flexible pivot through the fixed chuck, so that the lower end of the upper flexible pivot, the upper end of the lower flexible pivot and the fixed chuck deflect at the same deflection angle; the measuring unit is used for measuring the deflection angle of the lower end of the upper flexible pivot or the upper end of the lower flexible pivot;
the processing module is used for calculating the bending moment of the sample according to the deflection angle.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
a pure bending tester suitable for micro-scale materials, in particular to a slender flexible structure, solves the technical problems of low measurement precision, complex process and the like of the traditional bending measuring instrument.
1. The micro-scale pure bending tester provided by the invention adopts the rotating chuck rotating around the rotating motor to clamp one end of a sample, the fixed chuck clamps the other end of the sample, and the rotating motor is used for applying bending moment to the sample, namely, when the rotating chuck rotates around the motor, the sample is subjected to bending deformation, the bending moment is transmitted to the flexible pivot through the fixed chuck to cause the flexible pivot to twist, and the bending moment can be obtained according to the flexible pivot angle and the total stiffness coefficient measured by the measuring unit. Compared with the existing bending moment sensor, the measuring unit is simple to assemble, the flexible pivot is less affected by environments such as temperature and humidity, the measuring unit can be used in various environments and occasions, and the universality is good. The rotary stepping motor is adopted to carry out pure bending loading on the standard sample, the movement track is simple, the control is more convenient, the tester has simple structure, the manufacturing process difficulty is reduced, and the testing precision is high.
2. According to the microscale pure bending tester provided by the invention, the rotating clamping head end moves circularly around the rotating motor to form an eccentric circular track with the fixed clamping head part, and the eccentric circular track well approximates to a volute line, so that the experimental sample is subjected to pure bending. The length L of the sample is kept unchanged during bending, and the rotation angle of the chuck is rotatedCan be directly derived from the instrument. The motion trail of the end part of the rotary chuck is similar to a volute line, and the central angle beta of the sample is always equal to +.>Therefore, the curvature radius of the sample can be directly obtained according to the arc length formula. The curvature radius and the central angle do not need to be measured, so that the introduction of measurement errors can be avoided, and in addition, the tester has the advantages of simple structure, convenience in operation, high test precision and the like, and can provide powerful support for the bending performance test of microscale materials and the mechanical behavior research of microscale structures.
3. According to the microscale pure bending tester provided by the invention, the three-dimensional translation device is arranged, so that flexible pivots with different specifications can be replaced conveniently, measuring instruments with different measuring ranges and precision can be obtained, and wide-range measurement of bending moment of a sample is realized.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of a micro-scale pure bending tester according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional structure of a micro-scale pure bending tester according to an embodiment of the present invention;
fig. 3 (a) is a graph comparing the eccentric circle track with the standard spiral track, and fig. 3 (b) is a graph comparing the error of the fitting track with the standard track;
fig. 4 is a schematic three-dimensional structure of the rotating chuck according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
An embodiment of the present invention provides a micro-scale material pure bending tester, as shown in fig. 1, including: the device comprises a base, a support, a fixed chuck, a rotating motor, a measuring module and a processing module;
the rotating motor is arranged in the base, and the support is connected with the base;
the fixed chuck is used for clamping one end of a sample; the rotating chuck is used for clamping the other end of the sample, the rotating chuck is connected with the output end of the rotating motor through the rotating arm, and the rotating chuck is driven by the rotating motor to do circular motion around the rotating motor so as to enable the sample to generate pure bending deformation (at the moment, the motion track of the rotating chuck relative to the fixed chuck is an eccentric circular track), and the pure bending deformation of the sample enables the fixed chuck to deflect.
The measuring module comprises a measuring unit, an upper flexible pivot and a lower flexible pivot, wherein the rigidity coefficients of the upper flexible pivot and the lower flexible pivot are the same; the upper end of the upper flexible pivot and the lower end of the lower flexible pivot are respectively connected with the upper end and the lower end of the support, the upper flexible pivot, the fixed chuck and the lower flexible pivot are coaxially connected from top to bottom, and when the sample is subjected to pure bending deformation, bending moment is respectively transmitted to the lower end of the upper flexible pivot and the upper end of the lower flexible pivot through the fixed chuck, so that the lower end of the upper flexible pivot, the upper end of the lower flexible pivot and the fixed chuck deflect at the same deflection angle; the measuring unit is used for measuring the deflection angle of the lower end of the upper flexible pivot or the upper end of the lower flexible pivot;
the processing module is used for calculating the bending moment of the sample according to the deflection angle.
Preferably, the deflection angle of the lower end of the upper flexible pivot or the upper end of the lower flexible pivot satisfies the following relation with the bending moment of the specimen:
Q＝2kθ
wherein Q is the bending moment of the sample, θ is the deflection angle of the lower end of the upper flexible pivot or the upper end of the lower flexible pivot, and k is the rigidity coefficient of the upper flexible pivot or the lower flexible pivot.
Preferably, the deflection angle of the rotating chuck relative to the fixed chuck and the radius of curvature of the specimen satisfy the following relation:
wherein r is the sampleL is the length of the specimen,for rotating the angular deflection of the collet relative to the fixed collet.
Further, the rotation angle α of the rotary electric machine (i.e., the rotation angle of the rotary chuck with respect to the rotary electric machine) and the eccentric angle(i.e., the deflection angle of the rotating collet relative to the fixed collet) satisfies the following relationship:
where η is the eccentricity, i.e. the distance between the rotating electric machine 6 and the stationary chuck 8.
As shown in fig. 1, the rotation angle of the rotary chuck with respect to the rotary motor can be directly read from the dial. The deflection angle of the rotary chuck relative to the fixed chuck can be obtained through the formula
As shown in fig. 3 (b), the error increases sharply when the absolute value of the deflection angle of the rotating chuck with respect to the fixed chuck is greater than 90 degrees, resulting in serious inaccuracy of the measurement result, and therefore, it is preferable that the range of the deflection angle of the rotating chuck with respect to the fixed chuck is:that is, the deflection angle between the line connecting the center point of the spin chuck and the center point of the fixed chuck is preferably +.>
Specifically, as shown in fig. 1, taking an example in which the measuring unit includes first and second targets disposed at the lower end of the upper flexible pivot, and first and second laser displacement sensors, the measuring unit measures the deflection angle of the upper flexible pivot, the base 5 and the support 7 are connected by bolts, and the rotating motor 6 is installed in the base 5;
the support 7 is used for fixing the three-dimensional moving platform 1 and accommodating a pair of laser displacement sensors;
the fixed chuck 8 is fixedly connected with the support 7 and is used for clamping one end of a sample;
the rotating chuck 3 is fixedly connected with the motor rotating arm 4 and is used for clamping the other end of the sample and rotating around the center of the rotating motor 6;
the rotating motor 6 is fixedly arranged and provides a bending moment for a test object, and the bending moment is measured by the bending moment measuring unit; the bending moment measuring unit is composed of a pair of flexible pivots: an upper flexible pivot 2-1, a lower flexible pivot 2-2, and a pair of laser displacement sensors.
In the bending moment measuring unit, the position of the upper flexible pivot is finely adjusted by the three-dimensional moving platform.
The upper end and the lower end of the upper flexible pivot 2-1 are respectively fixed by the three-dimensional translation table and the fixed chuck, the upper end and the lower end of the lower flexible pivot 2-2 are respectively fixed by the fixed chuck and the support, and the upper end of the upper flexible pivot and the lower end of the lower flexible pivot are fixed in the use process of the tester. The two targets 10 (including the first and second targets) are fixed at two symmetrical positions of the upper flexible pivot, the laser displacement sensor 9 is placed in the support to measure the displacement changes of the two targets respectively, and the fixed chuck is fixed on the base.
The measurement of the flex pivot torsion angle is performed as follows: one end of the sample is clamped by the rotating chuck, and the other end of the sample is clamped by the fixed chuck, wherein the distance between the rotating motor and the fixed chuck is fixed. The rotating motor fixed on the base applies certain bending deformation to the sample through the rotating chuck, the bending moment of the sample is transmitted to the pair of flexible pivots through the fixed chuck, so that the flexible pivots are twisted (the lower end of the upper flexible pivot and the upper end of the lower flexible pivot are twisted), at the moment, the torsional deformation of the pair of flexible pivots drives the optical target to deflect, and the deflection of the optical target is measured differentially by the two laser displacement sensors, so that the torsion angle of the flexible pivots is obtained. Preferably, the rotating chuck moves circumferentially around the rotating motor.
Specifically, as shown in fig. 3, the rotating chuck 3 is fixedly connected with the rotating arm 4, the rotating arm 4 is fixed on the stepping motor 6, and rotates along with the stepping motor 6, the stepping motor 6 is placed in the base 5, the stepping motor 6 is not directly shown in the figure, one end of the rotating chuck 3 clamps a sample, the clamping end of the rotating chuck 3 rotates together with the rotating arm 4 to form an approximately spiral track taking the fixed chuck 8 as an origin of coordinates O, the other end of the fixed chuck 8 clamps the sample is fixed and remains motionless, during the rotation, the sample clamped between the rotating chuck 3 and the fixed chuck 8 can be purely bent, at this time, the deflection angle θ of the upper flexible pivot can be measured by the laser displacement sensor, and as the rigidity coefficients of the upper flexible pivot, the fixed chuck and the lower flexible pivot are the same, the bending moment suffered by the fixed chuck is uniformly transmitted to the upper flexible pivot and the lower flexible pivot, so that the lower end of the upper flexible pivot and the upper end of the lower flexible pivot deflect at the same angle, the bending moment q=2k, k is the total rigidity of the pair of the flexible pivots, and the bending moment can be obtained by the bending moment r, and the bending moment equation of curvature of the sample can be obtained by the bending moment equation.
When the deflection angle of the upper flexible pivot is measured, a measuring method of a laser displacement sensor is adopted, and the bending moment of the sample is converted into a couple action on the upper flexible pivot, so that the two ends of the upper flexible pivot relatively rotate; one end of the rotary table can rotate leftwards, and the other end of the rotary table can rotate rightwards; one end of the device can be fixed, and the other end of the device can rotate. The upper end and the lower end of the upper flexible pivot can rotate relatively, the optical target is fixed at the lower end of the upper flexible pivot, target points are arranged on two sides of the optical target, and the distance between the two target points is d. Two laser displacement sensors are placed in the support 7 for measuring the displacement of the optical target. A first laser displacement sensor measures displacement change x of target point at one end of optical target 1 The second laser displacement sensor measures the displacement change x of the target point at the other end of the optical target 2 。
Therefore, the rotation angle θ of the upper flexible pivot is
When θ is small (θ <2 °), it can be approximated as
The bending moment of the upper flexible pivot is proportional to the rotation angle theta, so that
Q＝2kθ
Wherein the torsional rigidity coefficient k can be obtained through a calibration experiment, and a bending moment value applied to the sample can be directly obtained, so that a bending moment Q of the tested sample can be obtained Sample preparation Equal to the bending moment Q of the upper flexible pivot, i.e. Q Sample preparation ＝Q。
The test object may be any microscale material of fixed length. It is understood that microscale materials refer to samples in which the thickness of the material is much smaller (e.g., differs by one or more orders of magnitude) than the length thereof.
To ensure test accuracy, the rotating chuck is deflected by a maximum angle of + -pi/2 (initially 0 deg.) around the stationary chuck.
Preferably, the method for measuring the micro rotation angle of the flexible pivot uses a laser displacement sensor to perform non-contact differential measurement, and obtains the target angle by measuring the relative displacement of two light target points.
Preferably, the rotating clamp head end employs a wedge clamp, as shown in fig. 4.
Preferably, the clamping is performed by filling the wedge-shaped area with a flexible material, thereby restricting movement of the sample.
Specifically, the rotating clamping end is of a wedge-shaped structure, when the sample is clamped, the wedge-shaped area is filled by flexible materials, and bolts are screwed into four holes on two sides, so that the movement of the sample is fixed and limited. This has the advantage that samples of different widths and different thicknesses can be clamped.
Preferably, the measuring unit comprises a first laser displacement sensor and a first optical target;
the first light target is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or the fixed clamp, and the first laser displacement sensor is used for measuring the displacement of the first light target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
Preferably, the measuring unit further comprises a second laser displacement sensor and a second optical target;
the first optical target and the second optical target are symmetrically arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixing clamp, and the first laser displacement sensor and the second laser displacement sensor are respectively used for measuring the displacement of the first optical target and the second optical target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
Preferably, the measurement unit comprises a laser, a first light target and a position sensitive detector;
the first optical target is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixing clamp, and the position sensitive detector receives the reflected light beam emitted by the laser after the laser beam is reflected by the first optical target so as to measure the displacement of the first optical target and further obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
Preferably, the measuring unit comprises an electro-optical autocollimator and a mirror;
the reflecting mirror is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixing clamp, and the photoelectric auto-collimator measures the deflection angle of the reflecting mirror to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
Preferably, the measurement unit comprises a first linear variable differential transformer and a first target;
the first target is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or the fixed clamp, and the first linear variable differential transformer is used for measuring the displacement of the first target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
Preferably, the measurement unit further comprises a second linear variable differential transformer and a second target;
the first target and the second target are symmetrically arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixed clamp, and the first linear variable differential transformer and the second linear variable differential transformer are respectively used for measuring the displacement of the first target and the second target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
Preferably, the tester further comprises: the upper end of the upper flexible pivot is connected with the upper end of the support through the three-dimensional translation device. That is, the three-dimensional translation device is connected with the upper end of the support, and the upper end of the upper flexible pivot is directly and fixedly connected with the three-dimensional translation device.
It will be appreciated that the first and second targets, mirrors, or first and second targets may be directly connected to the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or the upper end or lower end of the fixing clip, or may be connected via an intermediate member, for example, a sleeve fitted over the flexible pivot. The corresponding angle measuring device is arranged at the corresponding position of the support.
The microscale pure bending tester provided by the invention has the advantages that the rotating chuck end performs circular motion around the rotating motor, an eccentric circular track is formed between the rotating chuck end and the fixed chuck part, the chuck position is taken as the origin of coordinates O, the directions of the rotating chuck and the chuck are taken as the y axis, and the motion equation of the track of the sample point clamped by the rotating chuck end is that For rotating the chuck rotation angle, eta is the eccentricity, and r is the distance between the clamping sample point and the origin coordinate. The eccentric distance eta is the distance between the rotating motor 6 and the fixed chuck 8, and the eccentric circle motion track well approximates to a volute line, so that the sample is purely bent. The result of comparing the eccentric circle motion locus with the actual spiral line is shown in fig. 3 (a). The two are better in consistency as can be seen from the figure.
In summary, the microscale pure bending tester provided by the invention is driven by a rotating motor, one end of a sample is fixedly connected with a bending moment sensor, and the other end of the sample is connected with a rotating chuck rotating around the motor. When the rotating chuck rotates around the motor, the sample is bent and deformed, and at the moment, the elastic element (namely the flexible pivot) of the bending moment sensor in the instrument is deformed, namely the bending moment in the sample is the same as that of the flexible pivot, and the bending moment of the sample to be measured can be obtained by multiplying the torsion angle theta of the flexible pivot measured by the small-angle measuring unit with the rigidity coefficient k of the torsion angle theta. Because the length of the sample is unchanged and the rotary chuck end moves in a fixed track, the sample is bent into an arc shape, and the corresponding central angle beta is equal to 2 times of the rotation angle of the rotary chuckThe radius of curvature can be found by dividing the length by the central angle. The bending moment is measured by using the flexible pivot and the small-angle measuring unit, so that the structure is simpler, and the process difficulty is lower; the rotating stepping motor is adopted to carry out pure bending loading on the standard sample, the movement track is simple, and the control is more convenient. The rotation angle of the flexible pivot is indirectly measured by the laser displacement sensor, the resolution is high, the precision and the stability are further improved, and the automatic small-angle measurement is convenient to realize.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. A micro-scale material pure bending tester, comprising: the device comprises a base, a support, a fixed chuck, a rotating motor, a measuring module and a processing module;
the rotating motor is arranged in the base, and the support is connected with the base;
the fixed chuck is used for clamping one end of a sample; the rotary chuck is used for clamping the other end of the sample, is connected with the output end of the rotary motor through a rotating arm and moves circularly around the rotary motor under the drive of the rotary motor so as to enable the sample to generate pure bending deformation;
the measuring module comprises a measuring unit, an upper flexible pivot and a lower flexible pivot, wherein the rigidity coefficients of the upper flexible pivot and the lower flexible pivot are the same; the upper end of the upper flexible pivot and the lower end of the lower flexible pivot are respectively connected with the upper end and the lower end of the support, the upper flexible pivot, the fixed chuck and the lower flexible pivot are coaxially connected from top to bottom, and when the sample is subjected to pure bending deformation, bending moment is respectively transmitted to the lower end of the upper flexible pivot and the upper end of the lower flexible pivot through the fixed chuck, so that the lower end of the upper flexible pivot, the upper end of the lower flexible pivot and the fixed chuck deflect at the same deflection angle; the measuring unit is used for measuring the deflection angle of the lower end of the upper flexible pivot or the upper end of the lower flexible pivot;
the processing module is used for calculating the bending moment of the sample according to the deflection angle.
2. The meter of claim 1, wherein the deflection angle of the lower end of the upper flexible pivot or the upper end of the lower flexible pivot and the bending moment of the specimen satisfy the following relationship:
Q＝2kθ；
wherein Q is the bending moment of the sample, θ is the deflection angle of the lower end of the upper flexible pivot or the upper end of the lower flexible pivot, and k is the rigidity coefficient of the upper flexible pivot or the lower flexible pivot.
3. The meter of claim 1 or 2, wherein the deflection angle of the rotating collet relative to the fixed collet and the radius of curvature of the sample satisfy the following relationship:
where r is the radius of curvature of the specimen, L is the length of the specimen,for rotating the angular deflection of the collet relative to the fixed collet.
4. The tester of claim 3 wherein the measurement unit comprises a first laser displacement sensor and a first light target;
the first light target is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or the fixed clamp, and the first laser displacement sensor is used for measuring the displacement of the first light target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
5. The meter of claim 4, wherein the measurement unit further comprises a second laser displacement sensor and a second optical target;
the first optical target and the second optical target are symmetrically arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixing clamp, and the first laser displacement sensor and the second laser displacement sensor are respectively used for measuring the displacement of the first optical target and the second optical target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
6. The tester of claim 3 wherein said measurement unit comprises a laser, a first light target and a position sensitive detector;
the first optical target is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixing clamp, and the position sensitive detector receives the reflected light beam emitted by the laser after the laser beam is reflected by the first optical target so as to measure the displacement of the first optical target and further obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
7. A meter according to claim 3, wherein the measuring unit comprises an electro-optical autocollimator and a mirror;
the reflecting mirror is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixing clamp, and the photoelectric auto-collimator measures the deflection angle of the reflecting mirror to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
8. The tester of claim 3, wherein the measurement unit comprises a first linear variable differential transformer and a first target;
the first target is arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or the fixed clamp, and the first linear variable differential transformer is used for measuring the displacement of the first target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
9. The tester of claim 8, wherein the measurement unit further comprises a second linear variable differential transformer and a second target;
the first target and the second target are symmetrically arranged at the lower end of the upper flexible pivot or the upper end of the lower flexible pivot or on the fixed clamp, and the first linear variable differential transformer and the second linear variable differential transformer are respectively used for measuring the displacement of the first target and the second target so as to obtain the deflection angle of the upper flexible pivot or the lower flexible pivot.
10. The tester as described in claim 1, further comprising: the upper end of the upper flexible pivot is connected with the upper end of the support through the three-dimensional translation device;
the rotary chuck adopts a wedge-shaped clamp, and a wedge-shaped area of the wedge-shaped clamp is filled with flexible materials.
CN202310972158.4A 2023-08-03 2023-08-03 Pure bending tester for microscale material Pending CN117074210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310972158.4A CN117074210A (en) 2023-08-03 2023-08-03 Pure bending tester for microscale material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310972158.4A CN117074210A (en) 2023-08-03 2023-08-03 Pure bending tester for microscale material

Publications (1)

Publication Number Publication Date
CN117074210A true CN117074210A (en) 2023-11-17

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