Failure analysis of sensor diaphragm cracking

作     者：Kong Huan-ping Liu De-lin Liu Chang-kui 

作者机构：AECC Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation of Aero engine corporation of China Beijing China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing China AECC Failure Analysis Center Beijing China 

出 版 物：《Journal of Physics: Conference Series》 

年 卷 期：2021年第1907卷第1期

学科分类：07[理学] 0702[理学-物理学] 

摘      要：The sensor diaphragm cracked during the test project. Through macro and micro morphology observation, metallographic examination and hardness test, the diaphragm failure properties and reasons were determined. The results showed that the failure nature of the faulted diaphragm was bidirectional bending fatigue cracking. 1# crack failure was related to the greater bending stress borne at the bottom of the outermost corrugation. 2# crack failure was related to the greater stress borne by the root at the boundary between the outermost corrugation and the outer edge, the appearance of grain boundaries caused by the pickling process promoted the initiation and propagation of 2# crack.