Method for controlling fatigue life of stress relief piece through positioning vibratory stress relief

Abstract

The invention relates to a method for controlling the fatigue life of a stress relief piece through positioning vibratory stress relief. The method includes the following steps that: the stress relief region of the stress relief piece is determined; (2) modal analysis is carried out on the stress relief piece, a vibration mode is selected optimally, so that the stress relief region can be consistent with a fatigue region; (3) a card mounting mode and an excitation frequency are determined according to the selected vibration mode; (4) the magnitude of an excitation force is changed, dynamic stress testing is performed on the stress relief region; (5) pre-vibration residual stress testing is performed on the stress relief region; (6) different excitation forces are selected to carry out vibratory stress relief according to the step (4); (7) post-vibration residual stress testing is performed on the stress relief region, and testing results are compared with testing results obtained in the step (5); and (8) a fatigue test is carried out, so that the fatigue life of the stress relief piece after the vibratory stress relief of different excitation forces under a fixed vibration mode and a fixed excitation frequency. According to the method of the invention, the dynamic stress of the vibration vibratory stress relief is tested, and therefore, the blindness of the vibratory stress relief can be avoided. The method is high in universality and high in research result reliability.

Description

technical field [0001] The invention relates to a method for controlling the fatigue life of aging parts by positioning vibration aging, which is a method for studying the control method of positioning vibration aging and its process parameters on the fatigue life of aging parts. The invention belongs to the technical field of product quality control technology in mechanical manufacturing. Background technique [0002] With the rapid development of the modern aerospace industry and the increasingly fierce international competition, major military powers in the world have put forward high requirements on the performance of various aircraft. For this reason, in the structural design and manufacture of aircraft, rockets and other aircraft, some large and complex structural parts (up to several meters), especially the main load-bearing structural parts (such as aircraft girders, partitions, wall panels; rockets) Fairings, cabins, and strategic weapon warhead shells, etc.) gener...

AI Technical Summary

Problems solved by technology

However, vibration aging and "fatigue" have the same load properties. There has been a long-standing debate in the academic circles about whether vibration aging will reduce the fatigue life of workpieces. It has been virtually forbidden to apply vibration aging to workpieces bearing fatigue loads.

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