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采用有限元分析软件ANSYS/LS-DYNA,模拟了超音速冷喷涂过程中的颗粒碰撞过程,研究了高速颗粒与基板碰撞时的能量转化、分配以及颗粒沉积过程,分析了碰撞速度和材料特性对它们的影响.结果表明,碰撞过程中,颗粒和基板材料均发生塑性变形,使颗粒的动能被消耗,且绝大部分动能转变为材料内能.碰撞完成之后,颗粒动能被分配到颗粒和基板材料中,定义碰撞之后分配到颗粒中的与分配到基板中的能量之间的比值为能量分配系数K,K值过高或过低,均表明颗粒和基板之间变形能力相差较大,不利于颗粒与基板结合形成良好的涂层.系统初始动能以及颗粒与基板材料性能对K值都有影响.
The process of particle collision during supersonic cold spraying was simulated by finite element analysis software ANSYS / LS-DYNA. The energy conversion, distribution and particle deposition process of high-speed particles collided with the substrate were studied. The effects of collision velocity and material properties The results show that during the collision, the particles and the substrate material undergo plastic deformation so that the kinetic energy of the particles is consumed and most of the kinetic energy is transformed into the material internal energy. After the collision is completed, the particle kinetic energy is distributed to the particles and the substrate In the material, the ratio between the energy distributed to the substrate and the energy distributed to the substrate after impact is defined as the energy partition coefficient K, which is too high or too low, indicating that the deformability between the particles and the substrate is quite different and not Which will help the particles to form a good coating with the substrate.The initial kinetic energy of the system and the properties of the particles and the substrate material all affect the K value.