Monte Carlo Simulation of Stress Corrosion Cracking in Structural Metal Materials
Monte Carlo Simulation of Stress Corrosion Cracking in Structural Metal Materials
复制标题
结构金属材料应力腐蚀裂纹的蒙特卡罗模拟
DOI：
10.4028/www.scientific.net/kem.306-308.447
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Nobuhiro Ogai
中科院分区：
文献类型：
--
作者：
K. Tohgo;Nobuhiro Ogai
根据实验室加速试验数据，在材料、应力和腐蚀环境的共同作用下，结构金属材料中的应力腐蚀开裂（SCC）是通过微裂纹的萌生和贯通、亚临界裂纹扩展、多个大裂纹的形成和最终失效而发生的。本文提出了应力腐蚀开裂过程的计算机模拟模型。程序如下：在给定的空间中，设定了可能的裂纹萌生次数，所有裂纹的萌生时间由基于指数分布的随机数指定。裂纹的位置和长度分别由均匀随机数和正态随机数指定。根据断裂力学理论，确定了裂纹的贯通和亚临界裂纹扩展。当最大裂纹长度达到临界值或所有可能数量的裂纹都开始时，仿真终止。本文的结果表明，本模型的适用性预测应力腐蚀开裂行为在真实的结构的基础上，实验室加速试验数据。
According to laboratory accelerated test data, stress corrosion cracking (SCC) in structural metal materials occurs by initiation and coalescence of micro cracks, subcritical crack growth, multiple large crack formation and final failure under the combination of materials, stress and corrosive environment. In this paper, a computer simulation model for the process of SCC has been proposed. The procedure is as follows: The possible number of crack initiations is set for a given space and the initiation times for all cracks are assigned by random numbers based on exponential distribution. The sites and length of the cracks are assigned by uniform random numbers and normal random numbers, respectively. The coalescence of cracks and the subcritical crack growth are determined based on the fracture mechanics. The simulation is terminated when the maximum crack length reaches a critical value or all of the possible number of cracks is initiated. The results obtained in this paper indicate the applicability of the present model to predict the SCC behavior in real structures based on the laboratory accelerated test data.