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首页> 外文期刊>Journal of Applied Polymer Science >Electromechanical behavior of hybrid carbon/glass fiber composites with tension and bending
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Electromechanical behavior of hybrid carbon/glass fiber composites with tension and bending

机译：碳/玻璃纤维混杂复合材料在拉伸和弯曲作用下的机电行为

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摘要

To understand the smart (i.e., good memory) characteristics of hybrid composites of carbon fibers (CFs) and glass fibers (GFs) with epoxy resin as a matrix, the changes in the electrical resistance of composites with tension and on bending were investigated. The electrical resistance behavior of composites under tension changed with the composition of the CF/GF, as well as with the applied strain. The fractional electrical resistance increased slowly with increasing strain within a relatively low strain region. However, with further loading it increased stepwise with the strain according to the fracture of the CF layers. The strain sensitivity of the samples increased with increasing CF weight percentage, and the samples incorporating more than 40 wt % CF showed a strain sensitivity higher than 1.54 for a single CF. The changes in the fractional electrical resistance with bending were not so dominant as those with tension. This difference was attributed to the action of two cancelling effects, which are the increasing and decreasing fractional electrical resistance due to tension and compression with bending, respectively. On recovery from a large applied bending, the fractional electrical resistance decreased slowly with unloading because of the increase of contacts between the fibers that resulted from the reorganization of ruptured CFs during the recovery. Even the composites incorporating a relatively small CF content showed an irreversible electrical resistance with both tension and bending. However, the strain sensitivity being larger with tension than with bending is ascribed to the difference in their mechanical behaviors. (C) 2002 John Wiley Sons, Inc. [References: 15]
机译：为了理解以环氧树脂为基质的碳纤维（CFs）和玻璃纤维（GFs）混合复合材料的智能（即良好的记忆）特性，研究了复合材料的电阻随张力和弯曲的变化。复合材料在拉伸下的电阻行为随CF / GF的成分以及所施加的应变而变化。在相对较低的应变区域内，分数电阻随应变的增加而缓慢增加。但是，随着载荷的增加，其应力会根据CF层的断裂而逐步增加。样品的应变敏感性随CF重量百分比的增加而增加，并且掺入超过40 wt％CF的样品对单个CF的应变敏感性高于1.54。弯曲引起的分数电阻变化不如弯曲引起的变化大。该差异归因于两个抵消作用的作用，这两个抵消作用分别是由于拉伸和压缩弯曲所引起的分数电阻的增加和减少。从较大的施加弯曲中恢复后，由于在恢复过程中断裂的CF的重组导致纤维之间的接触增加，分数电阻随卸载而缓慢降低。甚至包含相对较低CF含量的复合材料在拉伸和弯曲时都显示出不可逆的电阻。然而，应变敏感性在拉伸时比在弯曲时更大，这归因于它们的机械性能的差异。 （C）2002 John Wiley Sons，Inc. [参考：15]

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