自制装置构造构件的平面纯剪切变形,将薄层状的树脂基碳纤维复合材料（CFRP）粘贴在构件的纯剪切区域表面,在弹性范围内分析了CFRP的电阻对平面纯剪切变形的响应。实验结果表明,剪应变导致单向连续碳纤维增强的CFRP的纵向电阻变化不明显,其剪切力阻效应灵敏度约为0.16;碳纤维毡增强的CFRP具有显著的剪切力阻效应,其电阻表现出随剪应变线性的可恢复的增加,其剪切力阻效应灵敏度约为2.58。结合线应变致力阻效应产生机制,并通过CFRP细观结构的分析得出,纤维的随机乱向分布及纤维搭接形态的多样性是碳纤维毡增强的CFRP存在剪切力阻效应的主要原因。
The film-like carbon fiber reinforced plastic (CFRP) sample was attached to the base component to invest its resistance response to pure shear strain in elastic range by a self-made device. The results suggested that shear strain doesn't induce obvious longitudinal resistance response for the unidirectional carbon fiber rein-forced CFRP for its small gauge factor of 0.16. A prominent shear strain induced piezoresistivity of a gauge factor of 2.58 was revealed for carbon fiber mat reinforced CFRP, which manifests as the resistance increasing with the shear strain with good linearity and reversibility. By the comparison with the mechanism of normal strain induced piezoresistivity and the analysis on the micro structure, the paper reaches the conclusion that the random directions of carbon fibers and the morphological diversity of the carbon fiber junctions are the chief cause for the shear strain induced piezoresistivity of carbon fiber mat reinforced CFRP.
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