摘要
对ＳｉＣｐ／ＺＬ１０１Ａｌ复合材料进行了层裂损伤演化实验，得到了试样的层裂损伤演化图像．通过对这些微损伤演化图像的微观观察和对微损伤的统计定量分析，发现在层裂损伤演化过程中，微损伤的形成和发展不仅与应力水平、作用时间相关，而且还与材料中的微结构分布密切相关．通过层裂损伤演化实验，得到了在这种复合材料中。
An experimental approach is used to investigate the spalling damage evolution in an Al-alloy reinforced with SiC particles. The microscopic observation and statistic quantitative analysis to the microdamage show that the microdamage occurred at the composite are themicrocracks, including particle cracking and debonding of interface betweenthe particle and matrix. The nucleation and devlopment of the microdamage not only depended on the stress levels and stress duration but also related to the microstructure distribution or particle distribution. The key results are (1) during damage initiation, the distribution of microcracks occurred in the composite is the same as that of the second phase particles in the original composite. And the total number of microcracks, on one unit area and one unit duration, is controlled by the stress levels, and (2) during extension, the microcracks' developing still depended on the distribution of the particles in the composite. Also, the extension speeds of the microcracks was obtained according to the experimental analysis, which increased with the stress levels under current experimental conditions.
出处
《力学学报》
EI
CSCD
北大核心
1997年第1期54-61,共8页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金
关键词
微裂纹
成核
扩展
微结构分布
复合材料
microcrack, nucleation, extension, distribution of microstructure
