动态载荷下Al-W颗粒复合材料的破碎机理
Mechanisms of fragmentation of Al-W granular composites under dynamic loading
摘要：
研究了铝（Al）和钨（W）颗粒复合材料圆环在爆炸载荷作用下的动态力学行为。观察到三种相互竞争的碎裂机制：连续水平机制产生由Grady-Kipp碎裂机制描述的大的宏观裂纹，介观机制由于拉伸应变在初始未结合的Al/W界面附近产生空隙和微裂纹，以及由于W颗粒和相邻Al之间的大速度梯度的发展而产生的介观喷射。这些介观机制可以用于定制尺寸通过为给定的加载条件选择适当的初始介观结构来分离碎片。
英文摘要：
Numerical simulations of Aluminum (Al) and Tungsten (W) granular composite rings under various dynamic loading conditions caused by explosive loading were examined. Three competing mechanisms of fragmentation were observed: a continuum level mechanism generating large macrocracks described by the Grady-Kipp fragmentation mechanism, a mesoscale mechanism generating voids and microcracks near the initially unbonded Al/W interfaces due to tensile strains, and a mesoscale jetting due to the development of large velocity gradients between the W particles and adjacent Al. These mesoscale mechanisms can be used to tailor the size of the fragments by selecting an appropriate initial mesostructure for a given loading condition.
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