PE-HD/PC/POE-g-MAH复合材料断裂性能的研究

采用基本断裂功(EWF)法评价了高密度聚乙烯(PE-HD)/聚碳酸酯(PC)/聚烯烃弹性体接枝马来酸酐(POE-g-MAH)复合材料处于平面应力与平面应变过渡状态下的断裂韧性和塑性功。研究不同PC含量对复合材料断裂行为的影响,并把宏观断裂参数的变化与复合材料的微观结构联系起来,从物质结构上寻求断裂功参数变化的原因。结果表明,随PC含量的增加,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;复合材料的缺口冲击强度随PC含量的增加而降低,缺口冲击强度高的材料比基本断裂功较小。

Study on Fracture Properties of PE-HD / PC / POE-g-MAH Composite

Fracture toughness and plastic work of PE-HD/PC/POE-g-MAH composites in the transition state of plane stress and plane strain were studied by using the essential work of fracture(EWF)method.The effects of PC content on the fracture behavior of the composites were studied,and the change reasons of fracture work parameters were explored from substance structure by combining the changes of macroscopic fracture parameters with microscopic struture of the composites.The results showed that with the increasing of PC content the specific essential work of fracture increased,while the specific plastic work of fracture decreased.The fracture toughness of the composites was mainly affected by the crack propagation resistance capability during the necking and tearing processes after yielding;the plastic deformation capability of the material also depended mainly on the fracture behaviors after yielding.It was found that the impact strength of the material decreased with the increasing of PC content.The composites with high impact strength,however,had low specific essential work of fracture.