Probabilistic properties of fatigue damage and an equivalent damage simplification model for multi-level load spectra
作者单位：School of Aeronautics Northwestern Polytechnical University
会议名称：《2016年航空科学与技术全国博士生学术论坛》
会议日期：2016年
学科分类：08[工学] 0825[工学-航空宇航科学与技术]
关 键 词：Equivalent damage simplification fatigue load spectrum statistical damage model fatigue damage and life
摘 要：An equivalent fatigue damage simplification model for multi-level load spectrum is proposed. On the basis of the probabilistic fatigue damage model which takes load sequence effect into account and the constant amplitude fatigue tests, probabilistic properties of damage accumulated in one loading block are achieved quantitatively by statistical methods. The new simplification model can ensure that, for the original spectrum and simplified spectrum, the probabilistic properties of fatigue damage are almost the same. Fatigue tests for Al-alloy straight plates are performed to test the validity of the model. The test results are in good agreement with predicted results.