不锈钢304在不规则载荷下的双轴疲劳

K. S. Kim, Bl Lee, J.C. Park
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引用次数: 17

摘要

对304不锈钢管状试样进行了变幅、不规则轴扭载荷下的疲劳试验。选择了三个参数来关联疲劳寿命:正常断裂的Smith-Watson-Topper (SWT)参数,剪切断裂的Fatemi-Socie (FS)参数和Kandil-Brown-Miller参数(KBM)。采用了基于正常(SWT)或剪切(FS, KBM)应变历史的雨流循环计数和Miner-Palmgren规则的寿命计算方法。发现,虽然寿命计算过程似乎是可行的,每个参数对大多数加载条件产生可接受的结果,但存在相关性较差的情况。除了扭转主导周期外,SWT参数表现良好,因为它高估了寿命。FS和KBM参数在扭转方面优于SWT参数,但在其他加载条件下表现较差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biaxial Fatigue of stainless steel 304 under irregular loading
Fatigue tests are performed on tubular specimens of stainless steel 304 under variable amplitude, irregular axial-torsional loading. Three parameters are chosen for correlating fatigue life: the Smith-Watson-Topper (SWT) parameter for normal fracture, Fatemi-Socie (FS), and Kandil-Brown-Miller parameters (KBM) for shear fracture. A life computation procedure is employed in which rainflow cycle counting on normal (SWT) or shear (FS, KBM) strain history and the Miner-Palmgren rule are used. It is found that, while the life calculation procedure appears to be viable and each parameter yields acceptable results for most loading conditions, there are cases for which correlation is poor. The SWT parameter performed well except for torsion-dominated cycles, where it overpredicted lives. The FS and KBM parameters did better than the SWT parameter in torsion, but showed poor performance in some other loading conditions.
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