Fatigue Limit Measurement of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames
Fatigue limit measurement is investigated experimentally on the grade B cast steel for Chinese railway freight car bogie frames. Small sample up-and-down test method was employed for the present study. Results reveal that fatigue cracks initiated mostly from the material cast shrinking cavities. Distinct river-like flowers and second cracks appeared on fracture surface in perpendicular to fatigue crack path. Lots of dimples are distributed in transient fracture district to indicate that present material is ductile. Maximum likelihood approach is applied for measuring the probabilistic fatigue limits, in which the limits are defined as the fatigue strengths following normal distribution at an expected fatigue life. Statistical parameters are then estimated by a likelihood function method. A comparison analysis to the existent conventional, Dixon-Mood and Zhang-Kececioglu approaches indicates that the maximum likelihood approach is the approach meeting the definition.
Cast steel Fatigue limit Railway Rolling wagon Bogie frame
LianYou Yu YongXiang Zhao
School of Mechanica, Electronics and Control Engineering, Beijing Jiaotong University, Beijing 10004 Institute of Engineering Reliability and Safety, Traction power State key Laboratory, Southwest Jiao
国际会议
沈阳
英文
121-125
2010-07-28（万方平台首次上网日期，不代表论文的发表时间）