聚碳酸酯拉伸应变局部化实验  

Experiment of Strain Localization of Polycarbonate

作　　者：胡文军[1] 符春渝[1] 王彤伟[1] 敬华[1] 

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《高分子材料科学与工程》2011年第3期112-115,共4页Polymer Materials Science & Engineering

基　　金：中国工程物理研究院科学技术基金资助项目(20040865)

摘　　要：采用电子散斑技术对聚碳酸酯材料拉伸过程的表面变形进行了实验研究,量化得到了试验在拉伸载荷作用下的连续变形分布,用扫描电镜(SEM)观察了断口形貌。结果表明,在粘弹性区域,沿拉伸方向产生平行的形变带,离面位移随载荷之间而增大;在屈服区域,产生应变局部化,形成800μm的剪切带,而且聚碳酸酯的断裂是由局部应力集中所致,其裂纹传播由次裂纹扩展速度控制的,断面形貌具有典型的抛物线特征。The electronic speckle pattern interferometry（ESPI） technology was introduced into the study on the deformation of polycarbonate tensile sample surface.According to the experimental work,the quantitative results on the deformation of the process of the tensile were got.Fracture morphology was observed by scanning electron microscope（SEM）.The experiment results indicate that parallel-deformation zone is produced on the viscoelastic region of stress history curve and out-of-plane displacement increases with load increasing;At the yield region,the phenomenon of strain localization becomes visible,shear band with the width of about 800 μm appears,fracture of polycarbonate is caused by local stress concentration,it′s controlled by the propagation speed of secondary crack,morphology of fracture surface shows characterization of parabola.

关 键 词：聚碳酸酯 应变局部化 拉伸变形 电子散斑 断裂 

分 类 号：O631.21[理学—高分子化学]