文献类型：期刊文献

中文题名：基于晶体塑性理论的GH4169合金缺口效应研究

英文题名：Study on Notch Effect of GH4169 Alloy by Crystal Plasticity Theory

作者：靖雅[1];钟飞[1];苑光健[1];曹贤[1];王润梓[1];周帼彦[1];张显程[1]

机构：[1]华东理工大学,承压系统与安全教育部重点实验室,上海200237

年份：2021

卷号：45

期号：5

起止页码：84

中文期刊名：机械工程材料

外文期刊名：Materials For Mechanical Engineering

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：国家重点研发项目(2018YFC1902404);国家自然科学基金资助项目(51725503);上海市教育委员会科研创新计划项目(2019-01-07-00-02-E00068)。

语种：中文

中文关键词：缺口效应;裂纹萌生寿命;晶体塑性模型;寿命预测

外文关键词：notch effect;crack initiation life;crystal plasticity model;life prediction

摘要：基于晶体塑性本构模型,通过生成宏观试样的代表性体积单元,对单轴拉伸和疲劳试验数据进行拟合以获得满足模拟条件的相关参数,并分析了网格尺寸对模拟结果的影响;采用累积塑性滑移和能量耗散作为指示因子进行疲劳裂纹萌生寿命预测,研究缺口尺寸对疲劳裂纹萌生寿命的影响。结果表明:采用所建立的模型获得的含缺口试样的疲劳裂纹萌生寿命在试验获得的疲劳裂纹萌生寿命2倍误差带内,模型具有较好的预测精度;当缺口尺寸较小时,随着缺口尺寸的增加,试样疲劳裂纹萌生寿命显著降低,当缺口尺寸大于临界缺口尺寸时,试样疲劳裂纹萌生寿命几乎不受缺口尺寸影响。
With the crystal plastic constitutive model, the uniaxial tensile and fatigue test data were fitted to obtain the relevant parameters that meet the simulation conditions, which was realized by generating the representative volume elements of macroscopic specimens. The effect of mesh size on the simulation was analysed. The cumulative plastic slip and energy dissipation were used as indicators to predict the fatigue crack initiation life, and the influence of notch size on the fatigue crack initiation life was studied.The results show that the fatigue crack initiation life of the notched specimen obtained by the established model was within two times the error band of the fatigue crack initiation life obtained in the test, indicating the model had good prediction accuracy. When the notch size was small, the fatigue crack initiation life of the specimen significantly reduced with increasing notch size;when the notch size was larger than the critical notch size, the fatigue crack initiation life of the specimen was hardly affected by the notch size.