液固撞击中锯齿状微结构对固体的保护作用

The Protection of Solid in Liquid-solid Impact by Microstructure

当高速液滴冲击固体时会在其表面及内部产生很大的应力。本文对比研究了固体母材在有无微结构两种情况下球形液滴撞击固体材料时固体母材中的应力场分布。结果表明在没有微结构时,固体母材中存在两个应力集中区:液滴和固体接触边缘的附近和轴线上一定深度的位置;当存在微结构并且微结构尺寸合适时,能够明显的减少应力集中达到保护固体母材的目的。这些研究结果对防止液滴侵蚀固体材料有一定的理论意义和工程应用价值。

Impact of the droplet with high speed brings very high stress to the surface and some internal section of the base solid material. This paper compares the stress distribution of the entity base solid and that with zigzag microstructure under the impact from spherical water drops. The entity base solid has two sections with highest stress： the contact edge and the axis. The zigzag microstructure with appropriate sizes can protect the base solid due to its contribution to decline of the stress in the sections with stress concentration. Relating to theory and practical application, this work may be helpful to prevent the erosion of droplets to the base solid.