Damage analysis for particle reinforced metal matrix composite by ultrasonic method
(1.中航第2集团608研究所，株洲4120022.Key Laboratory for Advanced Materials and Rheological Properties of Ministry of Education,Faculty of Material Photoelectron Physics, Xiangtan University, Xiangtan 411105, China)
Abstract: The damage characteristic of particle reinforced metal matrix composite (PMMC) was studied by ultrasonic non-destructive evaluation method. After the sample was damaged induced by tensile load, the ultrasonic wave that propagated in the sample were collected. The damage parameter was defined by ultrasonic parameter and the wave signals were analyzed by correlation method. The results show that with the increase of tensile load, the damage parameter increases and the correlation coefficient decreases. The fracture section morphologies of PMMC under tensile load were observed by SEM. It is found that there are many concaves in the metal matrix. Therefore the damage evolution can be concluded. The initial damage is induced by void nucleation, growth and subsequent coalescence in the matrix or interface separation.
Key words: particle reinforced metal matrix composite; damage analysis; ultrasonic method; non-destructive testing