CuW合金的细观累计损伤及裂纹演变模拟分析

Simulation of meso-scale accumulated damage and induced crack behaviors of CuW alloy

摘要:

考虑到细观累计损伤与微观结构的相互关系,对CuW合金的二维代表体单元施加循环载荷,应用Darveaux模型分析了CuW合金的累计损伤以及所引起的裂纹演变。分析结果表明：塑性滑移带首先形成于CuW合金的铜相区,随着循环次数的增加,细观损伤及裂纹萌生于钨颗粒的棱角处并沿着其边缘扩展,微裂纹的扩展路径主要受钨颗粒的分布状况影响,而烧结颈在一定程度上迟滞了微裂纹的扩展速度。

Abstract:

Considering of the relationship between meso-scale accumulated damage and microstructure, external cyclic strain load was applied on 2D representative volume element (RVE) of CuW alloys, and the accumulated damage and induced crack behaviors of CuW alloy were stimulated utilizing Darveaux model. The results show that the plastic slip bands appear on the copper phase at the beginning, damage and induced cracks of CuW alloy initiate at the corners and then propagate along and edges of tungsten grains with the increase of cyclic number, the propagation path of micro-cracks is affected by the distribution of tungsten grains mainly, while the sintering necks lower the propagation speed of micro-cracks on some extents.