Influence of Grain Size Distribution on Ductile Intergranular Crack Growth Resistance
Influence of Grain Size Distribution on Ductile Intergranular Crack Growth Resistance
复制标题
晶粒尺寸分布对延性晶间裂纹扩展抗力的影响
DOI：
10.1115/1.4045073
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Needleman, Alan
中科院分区：
文献类型：
--
作者：
Molkeri, Abhilash;Srivastava, Ankit;Osovski, Shmuel;Needleman, Alan
The influence of grain size distribution on ductile intergranular crack growth resistance is investigated using full-field microstructure-based finite element calculations and a simpler model based on discrete unit events and graph search. The finite element calculations are carried out for a plane strain slice with planar grains subjected to mode I small-scale yielding conditions. The finite element formulation accounts for finite deformations, and the constitutive relation models the loss of stress carrying capacity due to progressive void nucleation, growth, and coalescence. The discrete unit events are characterized by a set of finite element calculations for crack growth at a single-grain boundary junction. A directed graph of the connectivity of grain boundary junctions and the distances between them is used to create a directed graph in J-resistance space. For a specified grain boundary distribution, this enables crack growth resistance curves to be calculated for all possible crack paths. Crack growth resistance curves are calculated based on various path choice criteria and compared with the results of full-field finite element calculations of the initial boundary value problem. The effect of unimodal and bimodal grain size distributions on intergranular crack growth is considered. It is found that a significant increase in crack growth resistance is obtained if the difference in grain sizes in the bimodal grain size distribution is sufficiently large.
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