关键词: 非比例载荷, 雨流计数方法, 最大损伤面, 临界面

Abstract:

Rainflow cycle counting and linear damage rule were used to calculate fatigue damage for SWT, KBM, FS and LKN criteria by previous test results. The effects of the maximum damage plane, which was as the critical plane on previous criteria were discussed. It is shown that comparing with the maximum shear/normal strain approach, the predictions are improved by using the maximum damage plane approach, part nonproportional paths for SWT, AV and part nonproportional paths for KBM, TV paths for FS. But for LKN, the predictions are nonconservative for some paths by this approach than that of the maximum shear/normal strain approach. The critical plane was chosen according to the weight function approach. For KBM and FS criteria, the better predictions were gained. While for SWT and LKN criteria, the unconservative predictions were gained for some paths. The quantity evaluation of different criteria was done by using several statistic parameters.

Key words: nonproportional loading, rainflow cycle counting, maximum damage plane, critical plane