摘要
为了研究应变率对聚砜树脂力学性能的影响,对其进行了不同应变率的拉伸试验,同时通过摄像机记录了拉伸过程中试样形状的变化。结果表明:聚砜树脂的弹性模量和屈服强度随应变率的升高而增加,其应变率效应符合Eyring应变率理论;拉伸时试样颈缩面刚开始时是一个斜截面,表明聚砜树脂承受剪切的能力比较弱;试样中气泡、杂质等裂纹源形成的裂纹沿各自的平面扩展形成硬币状的裂纹,导致拉伸断裂(单裂纹源)或者拉剪破坏(错层式多裂纹源)。
To study the effect of strain rate on mechanical properties of polysulfone, tensile tests at different strain rates were performed, and the shape changes of samples during testing were recorded by camera also. The results show that the mechanical properties of the polysulfone were obviously ratedependent. Cracks induced by bubbles impurityies and other crack initiations propagated to form coin cracks along respective surfaces and resulted in tensile failure （single crack initiation） or tensile-shear failure （splitlevel multi-crack initiations）.
出处
《机械工程材料》
CAS
CSCD
北大核心
2008年第9期64-66,共3页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(0602054)
关键词
聚砜树脂
应变率
力学性能
断裂模式
polysulfone
strain rate
mechanical property
fracture mode
