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对T300/QY8911复合材料层板进行了低速冲击、冲击后压缩以及冲击后疲劳试验研究。通过对冲击后的层板进行目视检测和超声C扫描获得了层板受低速冲击后的若干损伤特征;在压-压疲劳试验中,测量了损伤的扩展情况。讨论了冲击能量与损伤面积以及冲击后剩余压缩强度的关系,分析了含冲击损伤层合板在压缩载荷及压-压疲劳载荷下的主要破坏机制。结果表明,低速冲击损伤对该类层板的强度和疲劳性能影响很大,在3.75J/mm的冲击能量下,层板剩余压缩强度下降了65%;在压-压疲劳载荷作用下,其损伤扩展大致可分为两个阶段,占整个疲劳寿命约60%的前一阶段损伤扩展较为缓慢;而疲劳寿命的后半阶段损伤则开始加速扩展,并导致材料破坏。
The T300 / QY8911 composite laminates were subjected to low-velocity impact, post-impact compression and post-impact fatigue test. Several damage characteristics of laminates after low-speed impact were obtained by visual inspection and ultrasonic C-scan of the impacted laminates. In the compression-compression fatigue test, the damage propagation was measured. The relationship between the impact energy and the damaged area and residual compressive strength after impact was discussed. The main failure mechanism of impact damaged laminates under compressive and compression-compression fatigue loads was analyzed. The results show that the low-speed impact damage has a great influence on the strength and fatigue properties of this type of laminate. Under the impact energy of 3.75J / mm, the residual compressive strength of the laminate decreases by 65%. Under the compression-compression fatigue loading, The damage extension can be roughly divided into two stages, which accounts for about 60% of the fatigue life, and the damage in the previous stage is relatively slow. However, the damage in the second half of the fatigue life begins to accelerate and lead to material damage.