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Four-point bending fatigue test clamp

A technology of fatigue test and four-point bending, applied in measuring devices, instruments, scientific instruments, etc., can solve problems that are difficult to meet the needs of engineering practice

Inactive Publication Date: 2015-07-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing four-point bending fatigue fixture is difficult to meet the needs of engineering practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] This embodiment is a four-point bending fatigue test fixture.

[0019] refer to Figure 1 to Figure 6 , the four-point bending fatigue test fixture consists of loading part 2, supporting part 3, base 4, pressure roller 5, specimen locking bolt hole 6, reinforcement plate 7, guide rail 8, supporting arm 9, supporting arm locking bolt hole 10, The specimen fastening device 11 is composed of the supporting part 3 and the loading part 2 respectively fixedly installed on the fatigue testing machine, the loading part 2 is installed on the middle upper part of the supporting part 3, and is coaxially fixedly installed with the supporting part 3; the supporting part 3 is used for Supporting the specimen 1 includes compression support and tension support; the loading part 2 applies pressure load and tension load to the specimen 1.

[0020] The base 4 of the support member 3 is provided with a guide rail 8 in the axial direction, and the guide rail 8 is a convex groove structure;...

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Abstract

The present invention discloses a four-point bending fatigue test clamp, which is used for carrying out pressing bending or pulling bending on a fatigue tester so as to achieve a four-point bending fatigue test under any load ratios and test the bending fatigue performance of a specimen. According to the clamp, a support member and a loading member are respectively and fixedly arranged on a fatigue tester, the loading member is positioned on the upper portion of the middle of the supporting member, the base of the supporting member is axially provided with a guide track, the bottom plates of two supporting arms are provided with supporting arm locking bolt holes, the two supporting arms are fastened on the guide track of the base through locking bolts and are symmetrically arranged, the distance between the two supporting arms can be adjusted, the upper end portions of the supporting arms are provided with two pairs of bolt locking devices provided with pressing rollers, the four pressing rollers are respectively snapped on the end portions of the two supporting arms, the specimen is fastened between the two pairs of the pressing rollers, two reinforcing plates are respectively fixed under the two pressing rollers, the specimen is arranged on the lower end of the loading member and is fastened between the two pairs of the pressing rollers through the locking bolts, the specimen contacts the pressing roller, pre-tightening is performed, and the load is applied.

Description

technical field [0001] The invention relates to a fixture for testing the bending fatigue performance of a specimen, in particular to a four-point bending fatigue test fixture. Background technique [0002] The four-point bending fatigue test is a test method used to measure the bending fatigue performance of materials. It puts the strip sample flat in the bending test fixture to form a simply supported beam form. The distance between the two lower support points supporting the sample can be adjusted according to the length of the sample. There are two symmetrical loads above the sample. point. Usually the four-point bending fatigue test needs to be carried out on a fatigue testing machine equipped with a four-point bending fixture. Because the four-point bending fixture of the current fatigue testing machine only has the function of compression fatigue. However, arbitrary stress ratio loads can be seen everywhere in actual engineering practice. Therefore, the existing f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/04
Inventor 乔吉超张纯姚志锋吕国建童钰娆尧
Owner NORTHWESTERN POLYTECHNICAL UNIV
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