High-velocity impacts of micro copper particles on the copper substrate in the cold spraying process are simulated and investigated with the material point method (MPM). Both the single-particle and the multiple-particle models are built and simulated. The large deformation and fracture phenomena induced by the impact can be well simulated with the MPM owing to its meshfree feature. The final configurations of the sprayed particle and the substrate agree well with the experimental results reported in the literature and the results of other numerical methods. It is observed that the interlocking between the particles and the substrate may be an important contributor to the bonding mechanism. Influences of the impact velocities and impact angles are investigated numerically in detail.

利用材料点法（MPM）模拟并研究了微铜颗粒在冷喷涂过程中对铜基材的高速冲击。建立和模拟了单粒子模型和多粒子模型。由于具有无网格特性，因此使用MPM可以很好地模拟由冲击引起的大变形和断裂现象。喷涂颗粒和基质的最终构型与文献中报道的实验结果以及其他数值方法的结果非常吻合。可以观察到，颗粒与基底之间的互锁可能是粘结机制的重要因素。数值研究了冲击速度和冲击角的影响。