用激光热冲击作为实验手段 ,研究了颗粒增强金属基复合材料在热 力耦合作用下的损伤与断裂 .在宏观上发现了这种复合材料的破坏效应是热 力耦合的非线性效应 .在微观上观察到了微观破坏的三种模式及微观结构对其热冲击性能的影响 ,同时定量测定了其在不同热 力耦合作用下的损伤程度 . The laser thermal shock was used as the experimental method to study the damage and fracture of the particle reinforced metal matrix composites under the thermal coupling effect. The macroscopical damage effect of the composite was found to be the nonlinear effect of thermal coupling. At the same time, the effects of three kinds of microscopic destruction and microstructure on the thermal shock performance were quantitatively measured, and the degree of damage under different thermal couplings was quantitatively determined.