Device for bending-torsion coupling fatigue test

By designing a device that includes a frame and transmission gears, bending-torsional fatigue testing is conducted using an existing fatigue testing machine. This solves the problems of high modification costs and inaccurate data associated with existing equipment, and achieves low-cost calculation of bending-torsional torque and accurate test data.

CN120971230APending Publication Date: 2025-11-18LANZHOU UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202511132366.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-13
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

The existing bending and torsion fatigue testing equipment has an unreasonable structural design, resulting in high modification costs and difficulty in obtaining accurate bending and torsion test data.

Method used

Design a device comprising a frame, a specimen end fixing mechanism, a bending and torsion force application mechanism, and a torsion force application drive mechanism. Utilize an existing fatigue testing machine to conduct bending and torsion coupled fatigue tests. A combination of a T-shaped steering gear and transmission gears is used to achieve synchronous application and accurate calculation of bending and torsion torque.

Benefits of technology

It eliminates the need to modify existing uniaxial fatigue testing machines, reducing modification costs, and can accurately calculate bending and torsional moments, providing precise fatigue test data support.

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Abstract

The invention discloses a device for a bending-torsion coupling fatigue test. The device comprises a frame, a test piece end fixing mechanism and a test piece force applying mechanism. Wherein the frame forms a square frame body structure. The test piece end fixing mechanism is mounted on the inner side of the frame and used for clamping one end of the test piece. The test piece force application mechanism and the test piece end fixing mechanism are transversely arranged in the frame at an interval, and the test piece force application mechanism comprises a lifting mechanism fixed on two opposite inner walls of the frame, a bending and twisting force application mechanism connected with the lifting mechanism, and a twisting force application driving mechanism in transmission fit with the bending and twisting force application mechanism and connected to the frame; the bending and twisting force applying mechanism and the test piece end fixing mechanism are transversely and oppositely arranged and are used for clamping and fixing the other end of the test piece. Under the condition that a traditional uniaxial fatigue testing machine is not modified, the upper and lower uniaxial loads of the fatigue testing machine can be converted into the bending-torsion multi-axial combined load of the test piece, accurate bending-torsion torques can be obtained, and effective data support is provided for a fatigue test.
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Citation Information

Patent Citations

  • Loading device used for lateral-torsional vibration fatigue experiment and method thereof

    CN108709793A

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