摘要
研究铺层结构对CFRP(Carbonfiberreinforcedplastics)准各向同性板损伤破坏和最终失效强度的影响 ,对几种不同的CFRP层合板进行拉伸试验 ,观察其损伤形态 ,并测定最终抗拉强度。利用有限元程序对完整结构以及带裂纹结构进行数值分析 ,讨论铺层结构、应力的数值分析结果以及损伤破坏之间的对应关系。
To investigate the damage features in quasi isotropic laminates and the influence of stacking sequence, tensile tests were conducted for six types of CFRP(Carbon fiber reinforced plastics) laminates. A microscope was used to observe the matrix cracking and delamination, and the ultimate strength was measured. Stress analyses were performed based on the FEM code ANSYS. The correlation between the numerical results and the practical observations was discussed. It is shown that damage (matrix cracking and delamination) initiates and growths around the 90 degree ply for all types of specimens. The tensile strength of specimens with 0 degree ply in the outer side is the highest, and those in which the 0 ply is placed in the second layer have lower strength. When the 0 ply is located in the inner side, the strength is the smallest. For each case, the equal angle stacking structure is better than the unequal angle stacking one. So the equal angle stacking structure with the 0 degree ply in the outer side is the best among the specimens examined, and it shows good damage tolerance features, i.e., there exists a long period between the first ply failure and the last ply failure. The FEM analysis results qualitatively agree well with the experimental observations.
出处
《机械强度》
CAS
CSCD
北大核心
2003年第3期241-245,共5页
Journal of Mechanical Strength
基金
国家自然科学基金 (1 0 2 72 0 4 9)
教育部回国留学人员基金 ([99] 747)资助项目~~
