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首页> 外文期刊>Theoretical and Applied Fracture Mechanics >Evaluation of multiaxial low cycle fatigue life for type 316L stainless steel notched specimen under non-proportional loading
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Evaluation of multiaxial low cycle fatigue life for type 316L stainless steel notched specimen under non-proportional loading

机译：316L型不锈钢缺口试样在非比例载荷下的多轴低周疲劳寿命评估

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摘要

This study discusses a multiaxial low cycle fatigue (LCF) life of notched specimen under proportional and non-proportional loading conditions at room temperature. Multiaxial LCF tests controlled by strain were carried out using a smooth and a circumferentially notched round-bar specimens of type 316L stainless steel (316LSS). Four kinds of notched specimens of which elastic stress concentration factors K-t are 1.5, 2.5, 4.2 and 6.0 were employed. The strain paths employed were proportional loading and non proportional loading. The former is push-pull loading and reversed torsion loading and the latter is circular loading achieved by the strain path of which axial and shear strains are loaded by 90 degrees sinusoidal out-of-phase. Total axial strain and total shear strain ranges were the same ranges based on von Mises. An evaluation of the fatigue life for the notched specimen is discussed based on the experimental results and also by employing an inelastic finite element analysis (FEA). The fatigue life is decreased with increase in Kt at each strain path and is underestimated by a maximum local strain range evaluated by FEA result. A proposed strain range defined by a local mean strain value near the notch calculated from FEA by taking into account the non-proportional effect is an appropriate parameter for life evaluation of 316LSS notched specimen under non-proportional loading. (C) 2016 Elsevier Ltd. All rights reserved.
机译：这项研究讨论了在室温下按比例和非比例加载条件下，缺口试样的多轴低周疲劳（LCF）寿命。使用由316L不锈钢（316LSS）制成的光滑且有圆周缺口的圆棒试样，进行了受应变控制的多轴LCF测试。弹性应力集中系数K-t为1.5、2.5、4.2和6.0的四种缺口试样被采用。所采用的应变路径是比例载荷和非比例载荷。前者是推拉载荷和反向扭转载荷，而后者是通过应变路径实现的圆形载荷，其轴向和剪切应变以90度正弦异相加载。总轴向应变和总剪切应变范围是基于冯·米塞斯的相同范围。根据实验结果并使用非弹性有限元分析（FEA），讨论了带缺口试样的疲劳寿命评估。疲劳寿命随着每个应变路径上Kt的增加而降低，并被FEA结果评估的最大局部应变范围低估。通过考虑非比例效应，由FEA计算得出的靠近缺口的局部平均应变值定义的拟议应变范围，是评估316LSS缺口试样在非比例载荷下寿命的合适参数。 （C）2016 Elsevier Ltd.保留所有权利。

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