摘要
研究了尼龙6(PA6)/CaCO3复合材料的单边缺口拉伸断裂。结果表明,PA6/CaCO3复合材料在拉伸速率为0.1～300 mm/min的缺口拉伸实验中,裂纹扩展均为脆性断裂。断口主要分为塑性屈服变形区和弹性变形区两部分。塑性屈服变形区形貌是以缺口根部为底边的圆弧型,弹性变形区将塑性屈服变形区包围在里面。塑性屈服变形区面积到达临界尺寸后,材料瞬间断裂。断裂后观察到的塑性屈服变形区面积即为在该实验条件下的裂纹源面积。随着拉伸速率增加,其裂纹源面积减小,而弹性变形区域增加,弹性储存能的储存速度增加,在其裂纹源面积较小的情况下即可发生瞬间脆断。
The single notched tensile fracture of PA6/CaCO3 composite is studied. In tensile velocity range （0.1 -300 mm/ min） , crack propagation is brittle fracture. Fracture surface consists of plastic yield deformation area and elastic deformation area. Plastic yield area is arc-type based on the root bottom, while the plastic zone is surrounded by elastic deformation area. As soon as plastic deformation zone reaches critical size, the sample fractures quickly. So the plastic yield area is the crack initiation origin. With tensile speed increasing, the area of crack origin reduces and elastic area increases, and the storing speed of elastic storage energy increases, which can result in brittle fracture with smaller crack origin.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2009年第9期68-70,共3页
Engineering Plastics Application
基金
贵州省自然科学基金资助项目[2009(2053)]
