作　　者： ; ; ; ; ; ;

机构地区： 四川大学高分子科学与工程学院

出　　处： 《工程塑料应用》 2005年第4期31-34,共4页

摘　　要： 用自行设计的带孔试样进行拉伸试验以模拟聚丙烯(PP)共混物试样受力时的变化。利用带孔试样拉伸试验得到的启示,系统分析了PP/CaCO3拉伸屈服强度的变化机理,发现塑性变形约束机制和微区硬化机制是极低分散相浓度共混物拉伸屈服强度高于纯PP拉伸屈服强度的原因,应力集中发生叠加后屈服易在整个基体层内扩散是高分散相浓度共混物拉伸屈服强度降低的原因。并成功地解释了多种体系中存在的这类现象。 Tensile tests were carried out on self-made PP specimens with holes to simulate the stressed state change of the PP blends. Based on these tests, the yielding mechanism of PP/CaCO_ 3 was studied. It was found that the restricting mechanism of plastic-deformation and the hardening mechanism of micro-region were the key factors that caused higher yield strength of the blend having low density dispersed phase than that of pure PP. The yield deformation dispersed in whole matrix after the superposition of stress concentration was the key factors for the decreasing of the yield strength of the blend. Similar phenomenon existing in many system were explained successfully.

关 键 词： 拉伸试验 共混物 试样 增强机理 拉伸屈服强度 推测 自行设计 变化机理 系统分析 硬化机制 约束机制 塑性变形 强度降低 应力集中 相浓度 聚丙烯 高分散 内扩散 原因

领　　域： [化学工程] [金属学及工艺] [金属学及工艺]