沥青基碳和对芳纶纤维的拉伸强度随应变速率的变化

H. Wagner, J. Aronhime, G. Marom
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引用次数: 38

摘要

理解增强纤维抗拉强度的速率依赖关系是理解相应复合材料性能的速率依赖关系的关键。因此,在本研究中,它试图澄清在不同应变速率下芳纶和碳纤维的力学响应,根据我们之前的观察,相应的混杂复合材料在静态和疲劳弯曲条件下的应变速率依赖。此外,还试图将速率敏感性与纤维结构有序程度联系起来。该研究使用低、中、高模量沥青基碳纤维以及凯夫拉29、49和149对芳纶纤维进行,其强度在0.004至2.0% s-1的应变率范围内进行测试。结果表明,在所有应变速率下,两种纤维族的强度结果均服从威布尔分布。在碳纤维的情况下,观察到两种不同的尺度参数作为应变率的函数。在低应变速率下,尺度参数随速率缓慢增加,而在高应变速率下,尺度参数明显减小。随着纤维结晶度的增加,这种趋势变得更加明显。低应变率行为由幂律击穿规则模型控制,而高应变率行为由尖锐晶间缺陷的生长速度决定。在芳纶纤维的情况下,尺度参数对应变率不敏感,这可能是由于这些纤维的断裂不一定涉及活化体积控制机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dependence of the tensile strength of pitch-based carbon and para-aramid fibres on the rate of strain
Understanding the rate dependencies of the tensile strength of reinforcing fibres is a key for the understanding of the rate dependencies of the properties of the corresponding composite materials. Hence, in this study it is attempted to clarify the mechanical responses of aramid and carbon fibres at different rates of strain in the light of our previous observations of strain rate dependence of the corresponding hybrid composites under both static and fatigue flexural conditions. In addition, it is attempted to correlate the rate sensitivity with the degree of structural order in the fibres. The study is carried out with low-, medium- and high-modulus pitch based carbon fibres and with Kevlar 29, 49 and 149 para-aramid fibres, whose strengths were tested at strain rates ranging between 0.004 to 2.0% s-1. It is shown that the strength results of the two fibre families follow the Weibull distribution at all strain rates studied. In the case of the carbon fibres two different régimes are observed for the scale parameter as a function of strain rate. At low strain rates the scale parameter increases slowly with the rate, whereas a strong decrease is observed at higher strain rates. This trend becomes more evident as the crystallinity of the fibre increases. The low strain rate behaviour is governed by the power law breakdown rule model, whereas the high strain rate behaviour is accounted for by the rate of growth of a sharp inter-crystallite flaw. In the case of the aramid fibres the scale parameter is insensitive to the strain rate, which supposedly results from a situation where fracture in these fibres does not necessarily involve an activation volume controlled mechanism.
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