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Device and method for measuring stress and strain of thin-walled pipe in two-way stress state

A stress-strain and bidirectional stress technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problem that the stress path of thin-walled tubes cannot be accurately controlled and the strain information can be accurately measured, and the stress and strain of thin-walled tubes cannot be obtained. Information and other issues, to achieve the effect of simple and easy structure, large strain measurement range, and enlarged stress variation range

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the existing devices and methods cannot realize the accurate controllable stress path and the accurate measurement of strain information of the thin-walled pipe under the bidirectional stress state, and cannot obtain accurate stress-strain information of the thin-walled pipe under the bidirectional stress state. Furthermore, a device and method for measuring the stress and strain of the thin-walled pipe in a two-way stress state are proposed

Method used

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  • Device and method for measuring stress and strain of thin-walled pipe in two-way stress state
  • Device and method for measuring stress and strain of thin-walled pipe in two-way stress state
  • Device and method for measuring stress and strain of thin-walled pipe in two-way stress state

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specific Embodiment approach 1

[0029] Specific implementation mode one: combine figure 1 , Figure 3-Figure 4 Explain that a thin-walled pipe bidirectional stress state stress-strain measurement device of this embodiment includes a base 1, a strain gauge 6, a movable beam 8, a pump station 15, an oil pressure booster 14, a force sensor 10, and a pressure sensor 13 , control system 12, two upper chucks 7, two lower chucks 4, two screw pairs 9 and two motors 2;

[0030] Two motors 2 are installed side by side on the base 1, and the axes of the two motors 2 are arranged vertically. The output end of each motor 2 is fixed with a lead screw pair 9, and the movable beam 8 is horizontally installed on the two lead screw pairs. 9 and fixedly connected with the nuts of the two lead screw pairs 9, the force sensor 10 is installed on the lower surface of the movable beam 8, the force sensor 10 is connected with the two upper chucks 7 through the connecting rod 3, and the base 1 is connected through the connecting rod...

specific Embodiment approach 2

[0033] Specific implementation mode two: combination image 3 and Figure 4 Note that the motor 2 in this embodiment is a servo motor, and the thin-walled tube bidirectional stress state stress-strain measurement device also includes a speckle strain measurement system 19, and the middle area of ​​the outer wall of the thin-walled tube 5 is sprayed with spots required by the speckle strain measurement system The speckle strain measurement system 19 is installed on the base 1, the CCD camera of the speckle strain measurement system 19 is used to collect the strain information of the thin-walled pipe 5, the strain signal output terminal of the speckle strain measurement system 19 is connected to the strain signal of the control system 12 input connection. In this way, the strain measurement is carried out by combining the speckle strain measurement system 19 and the strain gauge 6. When the deformation is small, the strain gauge 6 is used for measurement, and the speckle strain...

specific Embodiment approach 3

[0034] Specific implementation mode three: combination figure 2 , Figure 5-Figure 6 Explain that a thin-walled pipe bidirectional stress state stress-strain measurement device of this embodiment includes a base 1, a strain gauge 6, a movable beam 8, a pump station 15, an oil pressure booster 14, a force sensor 10, and a pressure sensor 13 , control system 12, movable platform 16, fixed platform 17, two lead screw pairs 9 and two motors 2;

[0035] Two motors 2 are installed side by side on the base 1, and the axes of the two motors 2 are arranged vertically. The output end of each motor 2 is fixed with a lead screw pair 9, and the movable beam 8 is horizontally installed on the two lead screw pairs. 9 and is fixedly connected with the nuts of two leading screw pairs 9, the movable stand 16 includes a movable upper plate 16-1, a movable lower plate 16-3 and two movable pull rods 16-2; the fixed stand 17 includes a fixed upper plate Plate 17-1, fixed lower plate 17-3 and two...

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Abstract

The invention relates to a stress-strain information measurement device and method for a thin-walled tube, in particular to a bidirectional stress state stress-strain measurement device and method for a thin-walled tube. The device and method are used for solving the problems that according to an existing device and method, accurate control over a stress path and accurate measurement of stress-strain information can not be achieved in a bidirectional stress state of the thin-walled tube, and the accurate stress-strain information can not be obtained when the thin-walled tube is in the bidirectional stress state. The device comprises a base, a strain gage, a movable beam, a pump station, an oil pressure booster, a force sensor, a pressure sensor, a control system, two upper chucks, two lower chucks, two lead screw pairs and two motors, wherein the two motors are installed on the base in parallel, and one lead screw pair is fixedly installed at the output end of each motor. The measurement method includes the main steps that firstly, the thin-walled tube is selected; secondly, the two ends of the thin-walled tube are fixed and sealed; thirdly, a bidirectional stress-strain experiment is started; fourthly, the stress-strain information is detected; fifthly, the thin-walled tube is broken, and experimental data are saved.

Description

technical field [0001] The invention relates to a measuring device and method for stress and strain information of a thin-walled pipe, in particular to a measuring device and method for stress and strain information of a thin-walled pipe in a bidirectional stress state. Background technique [0002] With the increasing maturity of finite element technology and computer technology, the finite element simulation of the plastic forming process of materials has become an effective tool for evaluating the forming performance of plates and pipes and the pros and cons of mold process design schemes. With the rapid development of my country's automobile and aerospace manufacturing industries, while the demand for parts with complex shapes is increasing, the quality requirements for products are also getting higher and higher. Therefore, the accuracy of finite element analysis technology in predicting the forming process requirements increased accordingly. In order to obtain simulati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12
Inventor 何祝斌苑世剑张坤
Owner HARBIN INST OF TECH
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