CN210893503U - Residual stress introducing device capable of keeping central position motionless - Google Patents

Residual stress introducing device capable of keeping central position motionless Download PDF

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Publication number
CN210893503U
CN210893503U CN201921620638.XU CN201921620638U CN210893503U CN 210893503 U CN210893503 U CN 210893503U CN 201921620638 U CN201921620638 U CN 201921620638U CN 210893503 U CN210893503 U CN 210893503U
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Prior art keywords
stress
sample
base
residual stress
shaped
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CN201921620638.XU
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Chinese (zh)
Inventor
彭光健
陈建锋
徐风雷
窦贵靖
赵城城
张泰华
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

A residual stress leading-in device for keeping a central position still comprises a base, a slide rail, a slide block, a stress applying assembly, a load sensor, a movable clamp and a pressing sheet, wherein the base is cross-shaped, and a boss with a groove is arranged in the middle of the base and used for placing a sample; one end of the load sensor is connected with the movable clamp, the other end of the load sensor is connected with the stress applying assembly and is connected with the equipped load display, and the pressing sheet is connected with the base through the fastening bolt and is used for pressing the cross-shaped sample. The utility model discloses a subassembly is applyed to the stress of both ends symmetry draws or presses the sample, can be in the inside even, arbitrary residual stress that produces of sample and do not introduce other stresses to the residual stress of introducing is for agreeing the reference value, can be used to the accuracy and the reliability of direct inspection residual stress detection technique. The utility model discloses exert and draw, compressive stress's mode is simple, convenient, need not frequently to change stress and applys the subassembly, has improved work efficiency.

Description

Residual stress introducing device capable of keeping central position motionless
Technical Field
The utility model relates to a material mechanics testing arrangement field, concretely relates to residual stress introducing device that keeps central point to put motionless.
Background
The residual stress has an important influence on the service performance of the service structure. The residual tensile stress can promote crack propagation and reduce the fatigue strength of the part. Meanwhile, the uneven distribution of the residual stress can also deform the part, and the shape precision and the size precision of the part are influenced. Therefore, the magnitude and the distribution of the residual stress are accurately tested, and the method has important influence on the engineering field. At present, more and more researchers are developing the research of non-destructive residual stress detection methods such as instrumented indentation, and the magnitude and direction of the residual stress in the sample need to be known accurately in order to calibrate or calibrate the residual stress detection methods. The residual stress is usually simulated by introducing a prestress by means of a residual stress introducing device.
The existing residual stress introducing device mainly generates stress through two modes of bending and tension and compression, the residual stress introduced by the method for bending the sample is unevenly distributed on the surface of the sample, the stress size needs to be obtained through calculation, and the error is large. When the stress applying device for the double-shaft tension and compression in the prior art applies stress to a cross-shaped sample, the center position of the sample is deviated under the action of the tension due to the complete limitation of the freedom degree of the cross-shaped sample, so that bending stress is introduced to one side of the cross-shaped sample, and the test result is finally influenced. Therefore, it is necessary to design a residual stress introducing device which can apply biaxial tension and compression stress to the sample and does not introduce other interference stress, so as to improve the accuracy of residual stress detection.
Disclosure of Invention
In order to overcome the prestressing force precision that current residual stress introducing device introduced lower and the unipolar draws and presses residual stress introducing device can't introduce the not enough of more complicated plane residual stress, the utility model provides a residual stress introducing device that keeps central point to put motionless can draw the residual stress who presses the combination evenly, wantonly at sample internal action to regard as the agreed truth value with the residual stress of introducing, be used for the accuracy and the reliability of instrumentization indentation equipment detection sample residual stress.
The utility model provides a technical scheme that its technical problem adopted is:
a residual stress leading-in device for keeping a central position still comprises a base, a slide rail, a slide block, a stress applying assembly, a load sensor, a movable clamp and a pressing sheet, wherein the base is cross-shaped, and a boss with a groove is arranged in the middle of the base and used for placing a sample; one end of the load sensor is connected with the movable clamp, the other end of the load sensor is connected with the stress applying assembly and is connected with the equipped load display, and the pressing sheet is connected with the base through the fastening bolt and is used for pressing the cross-shaped sample.
Further, the stress applying assembly comprises a driving motor, a coupler, a lead screw and a moving block, a threaded through hole is formed in the center of the moving block, the left end of the moving block is connected with the lead screw, the right end of the moving block is connected with a load sensor, the lead screw is driven to rotate through the driving motor, the moving block is further driven to move in the lead screw, and generated tensile force or pressure acts on the sample through the load sensor and the movable clamp.
And furthermore, the movable clamp is connected with the load sensor through threads, and a diamond-shaped groove is processed at the upper end of the movable clamp and matched with diamond-shaped joints at four ends of the cross-shaped sample to apply tensile and compressive stress to the sample.
Furthermore, a sliding rail is fixed on the base, and the moving block and the movable clamp are matched with the sliding block and move on the sliding rail for transmitting tensile and compressive stress.
The number of the stress applying assemblies, the load sensors, the movable clamp, the sliding rails and the sliding blocks is 4, and the stress applying assemblies, the load sensors, the movable clamp, the sliding rails and the sliding blocks are symmetrically distributed on the cross-shaped base.
The tensile and compressive load applied by the stress applying assembly is positioned at the intersection of the horizontal central plane and the vertical symmetrical plane of the cross-shaped test sample.
The beneficial effects of the utility model are that: the residual stress of any tension-compression combination in a plane can be generated, and the cross-shaped test sample is ensured to be under the action of the biaxial residual stress; the device can ensure that the stress state of the central test area of the cross-shaped sample is uniform and stable, and other interference stress such as bending stress is not introduced except tensile stress and compressive stress; the device has the advantages that the device has dual purposes of tension and compression, two test loading conditions of tension stress and compression stress can be realized on the cross-shaped sample through the stress applying assembly only by controlling the steering of the motor, and the operation is simple; the device is integrally designed, the structure is simple, the residual stress introduced into the cross-shaped sample is directly measured by the load sensor, and the device is accurate and reliable; the base of the device is provided with a guide rail for moving the movable block and the movable clamp, so that the direction of an applied force in the loading process is strictly parallel to the guide rail, and the device is stable and accurate; this device has pressed fixed preforming on the sample, plays the effect that compresses tightly to the sample, prevents that the sample from taking place warp deformation, reduces the clearance between sample and the base, guarantees measurement accuracy.
Drawings
FIG. 1 is a schematic view of the whole device of the present invention
FIG. 2 is a top view of the device of the present invention
FIG. 3 is a single structural diagram of the device of the present invention
FIG. 4 is a cross-shaped test area schematic view of a sample
The device comprises a base 1, a slide rail 2, a slide block 3, a driving motor 4, a motor support 5, a coupler 6, a lead screw 7, a moving block 8, a load sensor 9, a movable clamp 10, a cross-shaped test sample 11, a pressing sheet 12, a test area 13 and a fastening bolt 14.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 4, the residual stress introducing device for keeping the central position motionless comprises a base 1, a stress applying assembly, a load sensor 9, a movable clamp 10 and a pressing sheet 12, wherein the base 1 is designed to be cross-shaped, a boss with a cross-shaped groove is arranged in the middle of the base and used for placing a sample 11 to be tested, and bosses are arranged on the periphery of the base and used for fixing a motor support 5 and a driving motor 4.
The stress applying component comprises a driving motor 4, a coupler 6, a lead screw 7 and a moving block 8, and the moving block is fixed with the sliding block 3 and driven by the lead screw 7 to move on the sliding rail 2. One end of the stress applying component is fixed with the base 1, and the other end of the stress applying component is connected with the load sensor 9 through threads and used for applying tensile stress or compressive stress to the cross-shaped test sample 11.
The load cell 9 is a commercial mature product and the applied load size is directly readable from a mating load display.
The bottom of the movable clamp 10 is connected with the sliding block 3 and can move on the sliding rail 2, the top of the movable clamp is used for clamping a cross-shaped test sample 11, and the side surface of the movable clamp is connected with the load sensor 9 through threads and matched with the load sensor for transmitting tensile stress or compressive stress introduced by the stress applying assembly.
When stress is applied, the stress applying component controls the driving motor 4 to rotate so as to drive the screw rod 7 to rotate, further drives the moving block 8 to move on the sliding rail 2 so as to generate tensile stress or compressive stress, and the tensile stress or the compressive stress acts on the cross-shaped test sample 11 through the load sensor 9 and the movable clamp 10.
The four ends of the cross-shaped test sample 11 are designed into diamond-shaped interfaces and are matched with the diamond-shaped grooves on the movable clamp 10, and the cross-shaped test sample can be used for stretching and compressing.
The utility model discloses a use method: referring to fig. 1, firstly, a cross-shaped sample 11 to be measured is placed on a boss of a base 1, diamond joints at the end parts of the sample are clamped on four movable clamps 10 which are symmetrically arranged, then a pressing sheet 12 is placed on the cross-shaped sample 11, and the pressing sheet 12 is pressed and fixed on the base 1 through a fastening bolt 14 and is used for pressing the cross-shaped sample 11, preventing the sample from warping and deforming, and reducing the gap between the sample 11 and the base 1. After the sample is installed, the tensile stress control switch of the driving motor 4 is turned on, the sample is simultaneously pulled on two sides of the X axis, the compressive stress control switch of the driving motor 4 is turned on in the same way, the sample is simultaneously pressed on two sides of the Y axis, and the applied stress can be read through a matched display.
After the applied tensile stress or compressive stress value is stable, the device is placed on a mechanical property testing instrument table for experiment, after the required data are tested, the driving motor is controlled to enable the stress applying assembly to apply stress to other stress values, and the experiment process is repeated.
After the experiment is finished, the residual stress of the cross-shaped sample is calculated according to relevant experimental data and by combining the studied residual stress test method, and the test result is compared with the applied stress true value for analysis, so that the accuracy of the residual stress test method is verified.
The residual stress introducing device for keeping the center position immovable can generate uniformly distributed stress on the surface of the area to be measured of the sample by simultaneously applying force on two symmetrical sides of the sample. The device has simple structure, stable stress state and convenient application process of tensile stress and compressive stress, and can be used as a standard stress applying device for testing the residual stress on the surface of a material.
The foregoing is only a preferred embodiment of the present invention, and the scope of the present invention should not be considered limited to the specific form set forth in the description, but also be understood as the scope of the present invention.

Claims (6)

1. A residual stress leading-in device for keeping a central position still is characterized by comprising a base, a slide rail, a slide block, a stress applying assembly, a load sensor, a movable clamp and a pressing sheet, wherein the base is cross-shaped, and a boss with a groove is arranged in the middle of the base and used for placing a sample; one end of the load sensor is connected with the movable clamp, the other end of the load sensor is connected with the stress applying assembly and is connected with the equipped load display, and the pressing sheet is connected with the base through the fastening bolt and is used for pressing the cross-shaped sample.
2. The device for introducing residual stress for keeping the central position still as claimed in claim 1, wherein the stress applying assembly comprises a driving motor, a coupling, a lead screw and a moving block, the center of the moving block is provided with a threaded through hole, the left end of the moving block is connected with the lead screw, the right end of the moving block is connected with the load sensor, the lead screw is driven to rotate by the driving motor, the moving block is further driven to move in the lead screw, and the generated tension or pressure acts on the sample through the load sensor and the movable clamp.
3. A residual stress introducing device for keeping a central position still as claimed in claim 1 or 2, wherein said movable clamp is connected with the load cell by screw thread, and a diamond-shaped groove is processed at the upper end to be matched with diamond-shaped joints at four ends of a cross-shaped test sample for applying tensile and compressive stress to the test sample.
4. The residual stress introducing device for keeping the central position still as claimed in claim 2, wherein a slide rail is fixed on the base, and the moving block and the movable clamp are matched with the slide block and move on the slide rail for transmitting the tensile and compressive stress.
5. The residual stress introducing device for keeping the central position still in claim 1 or 2, wherein the number of the stress applying components, the load sensors, the movable clamps, the slide rails and the slide blocks is 4, and the stress applying components, the load sensors, the movable clamps, the slide rails and the slide blocks are symmetrically distributed on the cross-shaped base.
6. A residual stress introducing apparatus for keeping a center position still according to claim 1 or 2, wherein said stress applying unit applies a tensile and compressive load at a position where a horizontal center plane and a vertical symmetry plane of the cross-shaped test piece meet.
CN201921620638.XU 2019-09-27 2019-09-27 Residual stress introducing device capable of keeping central position motionless Active CN210893503U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921620638.XU CN210893503U (en) 2019-09-27 2019-09-27 Residual stress introducing device capable of keeping central position motionless

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921620638.XU CN210893503U (en) 2019-09-27 2019-09-27 Residual stress introducing device capable of keeping central position motionless

Publications (1)

Publication Number Publication Date
CN210893503U true CN210893503U (en) 2020-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921620638.XU Active CN210893503U (en) 2019-09-27 2019-09-27 Residual stress introducing device capable of keeping central position motionless

Country Status (1)

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CN (1) CN210893503U (en)

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