Extension of the Tanaka-Mura model for fatigue crack initiation in thermally cut martensitic steels
Extension of the Tanaka-Mura model for fatigue crack initiation in thermally cut martensitic steels
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DOI：
10.1016/j.engfracmech.2009.12.003
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发表时间：
2010-07-01
影响因子：
5.4
通讯作者：
Glodez, S.
中科院分区：
文献类型：
--
作者：
Kramberger, J.;Jezernik, N.;Glodez, S.
提出了一种用于热切割马氏体钢结构件裂纹萌生和扩展的多尺度数值计算方法。微裂纹萌生的数值模拟是基于Tanaka-Mura微裂纹成核模型，其中使用Voronoi镶嵌模拟合成微结构的单个晶粒。该模型增加了三个改进（多滑移带，微裂纹合并和分段微裂纹生成）。裂纹扩展，然后解决了一个宏观模型，使用线弹性断裂力学方法。还进行了一些实验测试，以检查数值模型的准确性。所提出的计算模型的结果与实验结果显示出合理的相关性。(c)2009爱思唯尔有限公司版权所有。
A multi scale numerical approach for evaluation of crack initiation and propagation in thermally cut structural elements made of martensitic steel is presented. A numerical simulation of micro-crack initiation is based on the Tanaka-Mura micro-crack nucleation model, where individual grains of synthetic microstructure are simulated using the Voronoi tessellation. Three improvements are added to this model (multiple slip bands, micro-crack coalescence and segmented micro-crack generation). Crack propagation is then solved on a macro scale model using linear elastic fracture mechanics approach. Some experimental tests have also been performed to check the accuracy of the numerical model. The results of the proposed computational model show a reasonable correlation with the experimental results. (c) 2009 Elsevier Ltd. All rights reserved.