The tensile and shear failure behavior dependence on chain length and temperature in amorphous polymers
The tensile and shear failure behavior dependence on chain length and temperature in amorphous polymers
复制标题
无定形聚合物中的拉伸和剪切破坏行为取决于链长和温度
DOI：
10.1016/j.commatsci.2014.03.071
复制
发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Rabczuk, Timon
中科院分区：
文献类型：
--
作者：
Zhao, Junhua;Lu, Lixin;Rabczuk, Timon
利用分子动力学模拟研究了无定形聚合物的拉伸和剪切破坏行为对链长和温度的依赖性。在不同温度下对链长范围较宽的烷烃进行了拉伸和剪切实验。我们发现，断裂率（断裂键数与所有聚合物链数的比例）在拉伸和剪切下增加链长和温度。对于给定的链长和温度，在相同的大应变下，剪切下的断裂速率总是高于拉伸下的断裂速率。对于给定的链长，拉伸和剪切应力随温度的升高而降低。我们提出了三种典型的断裂机制，有效地阐明了基于断链过程的优势的韧性断裂响应。(C)2014年爱思唯尔B。版权所有© 2016
The tensile and shear failure behavior dependence on chain length and temperature in amorphous polymers are scrutinized using molecular dynamics simulations. A wide range chain length of alkane is tested under tension and shear with various temperatures. We find that the broken rate (the broken bond number to all polymer chain number ratios) under tension and shear increases with increasing chain length and temperature. For a given chain length and temperature, the broken rates under shear are always higher than those under tension at a same large strain. For a given chain length, the tensile and shear stresses decrease with increasing temperature. We propose three typical fracture mechanisms to effectively elucidate the ductile fracture response based on the predominance of chain scission process. (C) 2014 Elsevier B. V. All rights reserved.