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Mixed mode delamination growth of multidirectional composite laminates under fatigue loading

机译：疲劳载荷下多向复合材料层板的混合模分层生长

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摘要

Fatigue delamination growth of multidirectional laminates with 45°/-45° fracture inter face was experimentally studied. Delamination tests under three mixed I/II mode ratios were carried out via mixed mode bending test apparatus. Significant R-curve effects on the fatigue crack growth rates and thresholds due to fiber bridging and crack branching were observed, which make the traditional Paris Law unsuitable. In this paper, a formerly developed modified Paris Law with the normalized strain energy release rate as the frac ture governing parameter is investigated again. The results from the multidirectional delamination tests fit the modified Paris Law very well, and hence have validated it by experiments. Moreover, the thresholds normalized to delamination resistance were uti lized to evaluate the critical fatigue crack growth conditions. By the combination of test data for both 0°/5° and 90°/90° laminates, an interface-independent normalized threshold was proposed, which was found linearly decreasing with mode mixture ratios.
机译：实验研究了45°/ -45°断裂界面的多向层压板的疲劳分层生长。通过混合模式弯曲测试设备在三种混合的I / II模式比下进行分层测试。观察到由于纤维桥接和裂纹分支而导致的R曲线对疲劳裂纹扩展速率和阈值的显着影响，这使传统的巴黎法不适用。在本文中，再次研究了以归一化应变能释放速率为断裂控制参数的修正巴黎定律。多方向分层测试的结果非常符合修改后的《巴黎定律》，因此已通过实验进行了验证。此外，还使用了标准化的抗脱层阈值来评估关键的疲劳裂纹扩展条件。通过结合0°/ 5°和90°/ 90°层压板的测试数据，提出了与界面无关的归一化阈值，发现该阈值随模式混合比线性降低。

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