氧化铝陶瓷多粒子冲蚀磨损的数值模拟

Numerical Simulation for Erosion Wear of Alumina Ceramics by Multi-Particles Impingement

采用LS-DYNA有限元分析软件建立多粒子冲蚀氧化铝陶瓷的有限元模型,运用LS-DYNA求解器对冲蚀过程进行仿真,通过观察靶材等效应力的分布分析冲蚀机制。结果表明:靶材体积磨损率随着冲蚀角度的增大而增大,在冲蚀角度达到90°时,体积磨损率达到最大值,表现出典型的脆性材料的冲蚀特性;靶材的体积磨损率随着冲蚀速度的增大而增大,且具有良好的线性增长关系;靶材的体积磨损率整体上随着冲击粒子粒径的增大而增大,但在达到临界尺寸的一段时间内会随着粒径的增大而减小;靶材会吸收粒子的一部分动能转化为自己的内能,但随着粒子冲击结束而离开靶材表面,靶材表面形成微裂纹以及部分单元失效,因此靶材的能量随着单元的失效而减小。

LS-DYNA was used to establish the finite element model of multi particles impacting on alumina ceramics,and the erosion process was simulated by using LS-DYNA solver. The erosion mechanism was analyzed by observing the distribution of Von Mises stress of the target. The results show that volume loss rate of the target is increased with increas- ing the impact angle, and volume loss rate reaches the maximum value at the impact angle of 90°, which exhibits erosion characteristics of typical brittle materials. Volume loss rate of the target is increased with increasing the impact velocity, and they have good linear growth relationship. Volume loss rate of the target is increased with increasing the impact particle size as a whole, but it is decreased within a period of time when the impact particle size reaches a critical size. The target absorbs part of the particles kinetic energy and transforms it into internal energy, and when the particles leave the target surface, micro-crack and some elements failure are formed on the target surface, therefore, the target total energy is decreased with the failure of the elements.