Nonproportional Low Cycle Fatigue Criterion for Type 304 Stainless Steel
Nonproportional Low Cycle Fatigue Criterion for Type 304 Stainless Steel
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DOI：
10.1115/1.2804541
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发表时间：
1995-07
影响因子：
1.2
通讯作者：
Takamoto Itoh;M. Sakane;M. Ohnami;D. Socie
中科院分区：
文献类型：
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作者：
Takamoto Itoh;M. Sakane;M. Ohnami;D. Socie
本文介绍了一个多轴低周疲劳参数，在非比例载荷下的相关寿命。对304不锈钢空心圆柱试样进行了14种比例应变路径和复杂非比例应变路径下的室温等幅低周疲劳试验。在非比例加载试验中，疲劳寿命与相同应变范围的比例加载试验相比降低多达10倍。非比例加载引起的疲劳寿命降低与附加的非比例循环硬化密切相关。最大主应力和应变范围的乘积与非比例疲劳数据相关。一个非比例循环硬化参数计算的应变路径，也提出了允许寿命估计直接从应变历史，而不需要一个循环塑性模型。
This paper describes a multiaxial low cycle fatigue parameter for correlating lives under nonproportional loadings. Constant amplitude low cycle fatigue tests were carried out under 14 proportional and complex nonproportional cyclic strain paths using type 304 stainless steel hollow cylinder specimens at room temperature. In nonproportional loading tests, fatigue lives are decreased by as much as a factor of 10 in comparison with those in proportional loading tests with the same strain range. Reduction in fatigue life due to nonproportional loading is closely related to additional nonproportional cyclic hardening. The product of the maximum principal stress and strain ranges correlated the nonproportional fatigue data. A nonproportional cyclic hardening parameter computed from the strain path is also proposed that allows life estimates to be obtained directly from the strain history without the need for a cyclic plasticity model.