PE－HD/硅灰石/POE-g-MAH复合材料的断裂行为

采用基本断裂功法（EWF）评价了高密度聚乙烯（PE－HD）/硅灰石/马来酸酐接枝乙烯－辛烯共聚物（POE-g-MAH）复合材料处于平面应力与平面应变过渡状态下试样的断裂行为，研究了不同硅灰石含量对复合材料断裂行为的影响。对该体系EWF方法的适用效果以及试样所处的应力状态进行了验证，用线性回归法处理数据成功得到了各断裂功参数。结果表明，随着硅灰石含量的增加，PE－HD/硅灰石/POE-g-MAH复合材料的比基本断裂功增加，比塑性功降低；复合材料的断裂韧性主要取决于屈服后材料抵抗裂纹扩展的能力，复合材料的塑性变形能力也更依赖于屈服后的行为；PE－HD/硅灰石/POE-g-MAH复合材料的缺口冲击强度随着硅灰石含量的增加而降低，缺口冲击强度高的材料比基本断裂功却较小。

Fracture Behavior of PE-HD/Wollastonite/POE-g-MAH Composites

The fracture behavior of PE-HD/wollastonite/POE-g-MAH composites in the mixed mode region was studied using the essential work of fracture(EWF) method.The applicability of EWF method and the stress state of the samples were verified.Linear regression was used on the experimental data to obtain the EWF parameters.With increasing wollastonite contents,the essential work of fracture increased,while the non-essential work of fracture decreased.The plastic deformation capability and the fracture toughness of the composites were mainly affected by the crack propagation resistance during the necking and tearing processes after yielding.It was also found that the impact strength of the material decreased with increasing wollastonite content.The materials with high impact strength,however,had low specific essential work of fracture.