振幅
材料科学
疲劳试验
压力(语言学)
复式(建筑)
常量(计算机编程)
冶金
结构工程
复合材料
物理
工程类
光学
化学
哲学
DNA
程序设计语言
生物化学
语言学
计算机科学
作者
Bernd M. Schönbauer,M. Fitzka,Ulrike Karr,H. Mayer
标识
DOI:10.1016/j.ijfatigue.2020.105963
摘要
High and very high cycle fatigue (VHCF) tests were performed with 17-4PH stainless steel under constant amplitude (CA) and variable amplitude (VA) loading at load ratios of −1 and 0.05. Stepwise (duplex) S-N curves were determined with failure from surface inclusions above the transition stress amplitude, σtr, and from the interior below σtr. Similar σtr for CA and VA loading were found. VA failure occurred at Miner damage sums between 0.1 and 0.9 (surface failure) and 0.2 and 2.2 (internal failure). Omission of stress amplitudes less than 60% of the maximum amplitude is allowable for VA studies in the VHCF regime.
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