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| PC／BMPE合金的裂纹扩展行为 | |
| 引用本文： | 戴文利 杨晓明 姜娜 张平. PC／BMPE合金的裂纹扩展行为[J]. 湘潭大学自然科学学报, 2007, 29(3): 84-87 |
| 作者姓名： | 戴文利 杨晓明 姜娜 张平 |
| 作者单位： | 1. 湘潭大学化学学院,湖南,湘潭,411105 2. 湘潭大学化学学院,湖南,湘潭,411105;陕西理工学院材料科学与工程学院,陕西,汉中,723001 3. 湘潭大学基础力学与材料工程研究所,湖南,湘潭,411105 |
| 摘 要： | 用扫描电镜(SEM)研究了聚碳酸酯/双峰聚乙烯(PC/BMPE)合金断裂面的形貌,其断裂面可以分为裂纹引发区和裂纹扩展区.裂纹扩展区形成了大量的纤维,且这些纤维具有很大的塑性形变,而裂纹引发区几乎没有纤维形成,这是裂纹在缺陷处引发时存在气穴现象的缘故.冲击作用所产生的应力导致了裂纹尖端微空穴和聚合物纤维连结的形成,这个过程包括表面牵拉和纤维拉伸,裂纹形成时存在纤维的微颈细化过程,并用微颈细化理论建立了其微颈细化的理论模型. |
| 关 键 词： | 聚碳酸酯 双峰聚乙烯 裂纹 扩展 |
| 文章编号： | 1000-5900（2007）03-0084-04 |
| 修稿时间： | 2007-04-06 |
Crack Evolution Behaviors of Polycarbonate/Bimodal Polyethylene Alloy |
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| DAI Wen - li,YANG Xiao - ming,JIANG N,ZHANG Ping. Crack Evolution Behaviors of Polycarbonate/Bimodal Polyethylene Alloy[J]. Natural Science Journal of Xiangtan University, 2007, 29(3): 84-87 | |
| Authors: | DAI Wen - li YANG Xiao - ming JIANG N ZHANG Ping |
| Affiliation: | 1. Chemistry College of Xiangtan University, Xiangtan 411105 China; 2. College of Material Science and Engineering, Shanxi University of Technology, Hanzhong 723001 China; 3. Institute of Fundamental Mechanics and Material Engineering, Xiangtan University, Xiangtan 411105 China |
| Abstract: | The morphology of fracture surface of polycarbonate/bimodal polyethylene(PC/BMPE) alloy was studied by scanning electron microscopy(SEM).The fracture surface can be divided into two regions: crack initiation region and crack propagation region.A large number of fibrils was formed in the crack propagation region, and the fibrils display large plastic deformations.But there is scarcely any fibril in the crack initiation region due to cavitation at defects which initiated cracks.Schematic formation of a craze as an interconnected structure of microvoids and polymer fibrils upon application of stress stem from impact force was presented.This process involve surface-drawing and fibril traction.It has been shown that crazing of the alloy is a micronecking process.The model of micronecking was established through the necking theories. |
| Keywords: | polycarbonate bimodal polyethylene crack evolution |
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