Abstract:

A method of programed load spectrum bench test for vehicle structure component was presented, which was based on the theory of equivalent pseudo-fatigue damage between road load and programed load. By Weibull analysis method, the test strategy was developed which reflected the relations among the confidence level, reliability requirements and sample size. For the research of programed bench test for transmission brackets, the failure mode was duplicated, which had the same root cause and fatigue life compared to the failure on road test. By analysing the data of fatigue life of test samples on bench test, the main reasons for impacting the reliability and durability of bracket were discussed. From the results of bench test, it can be proved that the method of programed load spectrum bench test is valid and more efficient.

Key words: fatigue life, programed load, road load, Weibull analysis

摘要：

基于疲劳伪损伤相关性分析，建立了与道路载荷等效的程序载荷谱；对构件疲劳寿命进行了威布尔分析，建立了在一定置信度、可靠度条件下最少样件的可靠性试验方案。通过变速箱支架台架可靠性试验，复现了与道路试验相同的失效模式、疲劳失效寿命，分析了影响变速箱支架疲劳寿命的因素，并验证了试验方法的有效性。

关键词: 疲劳寿命, 程序载荷, 道路载荷, 威布尔分析