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含低速冲击损伤复合材料层合板剩余压缩强度及疲劳性能试验研究

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Keywords: 复合材料层合板,低速冲击,剩余压缩强度,疲劳,损伤扩展

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Abstract:

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。

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