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首页> 外文期刊>Journal of Materials Engineering and Performance >Ratcheting Response of SS316 Steel Samples with Different Notch Shapes under Various Loading Spectra
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Ratcheting Response of SS316 Steel Samples with Different Notch Shapes under Various Loading Spectra

机译：不同凹口形状下SS316钢样品的棘轮响应在各种装载光谱下

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摘要

Ratcheting response of notched 316 stainless steel samples was examined under various low-high-high (LHH) and high-low-low (HLL) loading steps and sequences. Plate samples were tested under uniaxial asymmetric stress cycles contained circular or elliptical notches in center. Local ratcheting strain increased over loading steps of steel samples tested with LHH loading sequence, while it dropped in magnitude for samples tested with HLL loading histories. Local ratcheting strains were further evaluated through use of the Ahmadzadeh-Varvani (A-V) and Chaboche (CH) hardening models coupled with Neuber's rule to predict ratcheting at the vicinity of notch root in steel samples. Finite element (FE) method was employed to numerically assess local ratcheting around the notch root through the use of ABAQUS software. Horizontal X-ellipse, circular and vertical Y-ellipse notch shapes lead to the highest, intermediate and lowest local ratcheting results for steel samples as predicted by means of the A-V and CH frameworks as well as those simulated results through FE method. Simulated ratcheting results through FE analysis positioned on or above the measured values for various loading steps and sequences. Predicted ratcheting results through the CH model positioned slightly above measured data over the first loading step and were turned to higher magnitudes over steps 2 and 3 in LHH samples with different notch shapes. This model underestimated ratcheting over loading steps 2-3 for HLL loading sequences. The predicted results by the A-V model consistently agreed with experimental data over the first step in notched samples tested under LHH and HLL sequences. Last two steps however resulted in lower ratcheting results through this model.
机译：研究了316不锈钢缺口试样在各种低-高-高（LHH）和高-低-低（HLL）加载步骤和顺序下的棘轮响应。平板试样在中心含有圆形或椭圆形缺口的单轴非对称应力循环下进行试验。局部棘轮应变增加了用LHH加载顺序测试的钢试样的过载阶跃，而用HLL加载历史测试的试样的局部棘轮应变幅度下降。通过使用Ahmadzadeh Varvani（A-V）和Chaboche（CH）硬化模型，结合Neuber法则，进一步评估局部棘轮应变，以预测钢样品缺口根部附近的棘轮。通过ABAQUS软件，采用有限元方法对缺口根部的局部棘轮效应进行了数值评估。水平X-椭圆、圆形和垂直Y-椭圆缺口形状导致钢样品的最高、中等和最低局部棘轮结果，通过A-V和CH框架以及通过有限元方法模拟的结果进行预测。通过有限元分析得出的模拟棘轮结果位于不同加载步骤和顺序的测量值之上或之上。在第一个加载步骤中，通过CH模型预测的棘轮效应结果略高于测量数据，并在具有不同缺口形状的LHH样品中，在步骤2和3中变为更高的量级。该模型低估了HLL加载序列的棘轮过载步骤2-3。在LHH和HLL序列下测试的缺口样品中，A-V模型的预测结果与第一步的实验数据一致。然而，通过该模型，最后两个步骤导致较低的棘轮效应结果。

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