Feasibility of crankshaft fatigue analysis using notched specimen
                                     LI Jianfeng1, ZHONG Jianfeng2, SUN Songsong2, LIU Zhentao2
(1.State Key Laboratory of Internal Combustion Engine Reliability, Weichai Power Co., Ltd., Wei fang 261061,China; 2.Power Machinery & Vehicular Engineering Institute, Zhejiang University, Hangzhou 310027, China)

Abstract: The study was carried out aiming to explore the feasibility of replacing the actual crankshaft with a standard notched specimen for fatigue analysis. A type of crankshaft was taken as the research object and the stress state was analyzed using the finite element method. The circular and elliptical notched specimens were designed based on the crankshaft. The influence of size parameters towards the stress distribution and stress gradient distribution was investigated. Optimization design method was proposed, and the finite element calculation and crankshaft bending fatigue test results of elliptical notch specimen were also compared. The results show that the elliptical notched specimen has higher equivalent precision than the circular one both in stress state and stress gradient, and the maximum error between them is less than 2.07%, which verifies the feasibility of applying elliptical notch specimen to crankshaft fatigue analysis.

Key words: crankshaft; notched specimen; feasibility; test