Failure analysis on piston connecting rod mechanism of diesel engine

doi:10.13251/j.issn.0254-6051.2022.07.048

Abstract

Abstract: A malfunction of piston connecting rod mechanism of diesel engine occurred during use. After dismantling, various degrees of fractures were found that on the cylinder, piston and connecting rod. The comprehensive analysis was carried out by means of macro and micro examination of the fracture, chemical composition and microstructure analysis in combination with the production process. The results show that the connecting rod was the failure maker, and the cylinder and piston belong to secondary fracture in this cascading failure. The folding defects on the surface of the connecting rod caused by improper shot peening process, which induces the initial fatigue damage because of the stress concentration. Meanwhile the undesirable microstructure weakens the strength of the connecting rod in a certain degree. The connecting rod high cycle fatigue fracture and the cylinder and piston damage one by one under the action of cyclic stress and the inertia force.

Key words: piston linkage mechanism, shot peening , folding defect, fatigue fracture

CLC Number:

TG157

Jiao Li, Shang Haikun, He Jianfeng, Wang Guoliang, Feng Tao, Wang Jia, Hu Yutao. Failure analysis on piston connecting rod mechanism of diesel engine[J]. Heat Treatment of Metals, 2022, 47(7): 277-282.

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