Multilevel static-dynamic coupling mechanical loading device for high-frequency fatigue test

Abstract

The invention relates to a multilevel static-dynamic coupling mechanical loading device for a high-frequency fatigue test, and belongs to the fields of scientific instruments and mechanical property tests of materials. The device comprises a high-frequency fatigue loading unit, a low-frequency fatigue loading unit, a tensile loading and detection unit and a synchronous rotating unit. The device realizes tensile fatigue loading through a servo motor, a piezoelectric stack and an ultrasonic vibrator assembly, and simultaneously realizes detection of load and displacement through a mechanical sensor and an optical fiber displacement sensor. The motor drives a rotating mechanism by a motor to realize real-time dynamic crystal diffraction characterization performed on a sample by a synchronous radiation light source. Moreover, a dual-V gap feature defect sample can realize a composite load test mode of tensile-sheering or tensile-bending and the like close to the actual stress form of a material. The multilevel static-dynamic coupling mechanical loading device provided by the invention is compact in structure, and can integrate multiple test methods, thereby providing an effective test tool for the high-frequency fatigue test of the material.

Description

technical field [0001] The invention relates to the field of scientific instruments and material mechanical performance testing, and is a multi-stage static-dynamic coupling mechanical loading device for high-frequency fatigue tests. The invention is a multi-stage static-dynamic coupling mechanical loading device with synchrotron radiation analysis function under integrated high-frequency fatigue service conditions. It can apply small static tensile load (50N, 30μm), low-frequency alternating load (<50Hz) or high-frequency alternating load (20kHz), through the real-time characterization of synchrotron radiation analysis, it can study the fatigue evolution behavior of material microstructure, for Provide testing equipment for in-depth understanding of high-frequency fatigue service performance of materials. Background technique [0002] The main parts and components in many fields of modern engineering (such as construction machinery, automobiles, ships, aircraft, etc.) a...

AI Technical Summary

Problems solved by technology

However, the existing commercial products of ultra-high frequency fatigue testing equipment are generally huge in size, which are bulky compared with small low-cycle fatigue testing machines, and it is difficult to realize the rotation around the vertical axis.

On the other hand, the ultra-high frequency fatigue testing machine on the market today is developed according to the Mason prototype. In order to realize ultra-high frequency ultrasonic vibration, its design structure is relatively fixed, and the rotation of the vibration unit cannot be realized, so that the tested piece can obtain Rotational degrees of freedom about its vertical axis as the axis of rotation

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