Effect of temperature and strain rate on the tensile deformation of polyamide 6
Effect of temperature and strain rate on the tensile deformation of polyamide 6
复制标题
温度和应变速率对聚酰胺6拉伸变形的影响
DOI：
10.1016/j.polymer.2007.03.013
复制
发表时间：
2007-05-04
期刊：
影响因子：
4.6
通讯作者：
Fu, Qiang
中科院分区：
文献类型：
--
作者：
Shan, Gui-Fang;Yang, Wei;Fu, Qiang
采用3种不同初始形状和物理尺寸的尼龙6（PA 6）试样，研究了拉伸温度和应变速率对PA 6拉伸变形的影响。结果表明，只要给定一定的温度和应变速率，以及合适的初始结构，PA 6确实存在特殊的双屈服现象。第一屈服应力与温度近似呈线性关系，与应变率近似呈对数关系。温度和应变速率敏感性的变化在拉伸温度附近的玻璃化转变温度的PA 6。PA 6的双屈服不仅是两个依赖于温度和应变速率的热激活速率过程的组合，而且与样品的初始结构有关。PA 6的屈服方式似乎是由非晶相和晶相变形的协同作用决定的。因此，具有双屈服的PA 6中应该形成一些涉及结晶相和非晶相的特殊结构。特别是要考虑到内部和内部链接的重要作用。部分熔融-再结晶理论不能完全解释PA 6的双屈服。(C)2007爱思唯尔有限公司版权所有。
The effects of the draw temperature and the strain rate on the tensile deformation of polyamide 6 (PA6) were investigated using three PA6 samples with different initial shapes and physical dimensions. It is observed that the special double yielding phenomenon is indeed present in PA6, provided that certain temperature and strain rate are given, as well as the appropriate initial structure. The results also show that the dependence of the first yield stress on temperature is nearly linear while on strain-rate is logarithmic. The temperature and strain-rate sensitivity change at the draw temperature in the vicinity of the glass transition temperature of PA6. The double yielding of PA6 is not only the combination of two thermally activated rate processes depending on temperature and strain rate, but also associated with the initial structure of samples. The yielding manner for PA6 seems to be determined by the synergetic effect of both the deformation of amorphous and crystalline phases. Thus some special structure involving the crystalline and amorphous phases should come into being in PA6 exhibiting double yielding. Especially the important role of inter- and intra-link should be taken into account. The theory of partial melting-recrystallization cannot account fully for the double yielding of PA6. (C) 2007 Elsevier Ltd. All rights reserved.