激光冲击强化技术中自由约束层理论厚度的研究

Study on Theoretical Thickness of Free Limiting Layer in Laser Shock Processing

针对激光冲击强化应用技术中的自由约束层厚度的问题 ,分析了涂层气化、爆炸形成的向金属层内部和自由约束层内部传播的高强度压力、自由约束层与涂层之间的粘着力和约束层本身性能之间的关系。推导了自由约束层的最佳理论厚度———既能获得最佳冲击强化效果 。

This paper studies the thickness of the free limiting layer in the laser shock processing. It analyses the relationship among the high-intensity pressure caused by coating vaporization and explosion and transmitted into the interior of the metal layer and that of the free limiting layer, the adherent force between the free limiting layer and the coating, and the properties of the free limiting layer. On the above basis, the optimum thickness of the free limiting layer is obtained, which guarantees not only the optimum LSP effect but also the elimination of the free limiting layer at a time.