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通过不同材料配方使复合材料板内沿厚度方向的断裂韧性呈梯度变化,推导出梯度复合材料在任一点处的断裂韧性值KIC表达式。根据所得到的KIC表达式,调整材料配方设计并制备出所需要的KIC梯度复合材料。采用落重冲击试验方法进行了断裂性能验证试验,观察裂纹的实际扩展情况。结果表明:由KIC梯度复合材料制成的结构在冲击条件下,层内引发的宏观裂纹在低KIC板面内高速扩展,而沿厚度方向随着KIC的增大,裂纹传播困难,满足KIC梯度复合材料设计要求。
The fracture toughness of the composite plate along the thickness direction changes with the gradient of different material formulations, and the fracture toughness KIC expression at any point of the gradient composite material is deduced. Based on the resulting KIC expressions, the material recipe design was adjusted and the desired KIC gradient composites were prepared. The impact strength test was used to verify the fracture performance and to observe the actual crack propagation. The results show that the macroscopically induced macrocracks propagate rapidly in the low KIC plate under impacting conditions and the KIC gradient propagates along the thickness direction with increasing KIC. Composites design requirements.