A small-angle X-ray scattering study and molecular dynamics simulation of microvoid evolution during the tensile deformation of carbon fibers
A small-angle X-ray scattering study and molecular dynamics simulation of microvoid evolution during the tensile deformation of carbon fibers
复制标题
碳纤维拉伸变形过程中微孔演化的小角X射线散射研究和分子动力学模拟
DOI：
10.1016/j.carbon.2011.08.040
复制
发表时间：
2012-01-01
期刊：
影响因子：
10.9
通讯作者：
Xu, Jian
中科院分区：
文献类型：
--
作者：
Zhu, Caizhen;Liu, Xiaofang;Xu, Jian
采用小角 X 射线散射和分子动力学模拟来研究拉伸变形过程中碳纤维 (CF) 的微孔演化。测量了应力-应变关系以及微孔的长度、直径、取向角和相对体积等参数。结果表明，CFs拉伸变形过程中，（1）微孔体积逐渐增大； (2)微孔相对于纤维轴的取向角减小； (3)平均微孔长度统计上下降； (4)短程结构没有变化，但部分C-C键长增加，中长程结构变得无序； (5)部分C-C-C角度向小角度偏移； (6)键长的增加和键角的减小主要出现在应力集中区，是关键破坏点。结果表明，合理控制小微孔的生长和应力释放可以提高CF的性能。 Crown 版权所有 (C) 2011 由 Elsevier Ltd 出版。保留所有权利。
Small angle X-ray scattering and molecular dynamics simulation were used to study the microvoid evolution in carbon fibers (CFs) during tensile deformation. The stress-strain relation and the parameters of microvoids, such as the length, diameter, orientation angle and relative volume were measured. The results demonstrated that during the tensile deformation of CFs, (1) the microvoid volume increased gradually; (2) the microvoid orientation angle with respect to the fiber axis decreased; (3) the mean microvoid length statistically decreased; (4) the short range structure did not change while the bond length of partial C-C increased and the medium and long range structure became disordered; (5) the angle of partial C-C-C shifted to the small angle; (6) the increase of bond lengths and decrease of bond angles mainly appeared at stress concentration areas which were the key damage points. It was indicated that reasonable control of small microvoid growth and stress release could improve the performance of CFs. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.