中文摘要：

考虑到细观（Meso-scale）累计损伤与微观结构的相互关系,对Cu W合金的二维代表体单元施加循环载荷,应用Darveaux模型分析了Cu W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Cu W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。

英文摘要：

Considering the relationship between Meso-scale accumulated damage and microstructure,external cyclic strain load was applied on 2D representative volume element（RVE） of Cu W alloys,and the accumulated damage and induced crack behaviors of Cu W alloy were stimulated using Darveaux model.The results show that the plastic slip bands appear on the copper phase at the beginning.Damage and induced cracks of Cu W alloy initiate at the corners and then propagate along the 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 slow down the propagation speed of micro-cracks to some extent.