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Abstract
Self-sensing multifunctional composite has sensing function using electrical resistance changes. Carbon Fiber Reinforced Polymer (CFRP) composite is one of the self-sensing multifunctional composites. For the reliability of the self-sensing, electrical contact between the lead wire and the carbon fibers is the most important issue. The present study focuses on the effect of the cyclic loading of lower applied strain range than the fatigue damage level. As a result, the electrical contact resistance at the copper electrode increased with the increase of cycles. That means that the electrical change at the electrodes must be considered for the long-term self-sensing monitoring system. When a four-probe method is used to measure the electrical resistance, the contact resistance effect is minimized. Moreover, angle-ply laminates have plastic deformation caused by shear loading, and that causes electrical resistance decrease during the cyclic loading. Cross-ply laminates of CFRP composites have no electrical resistance increase without damage. Quasi-isotropic laminates of CFRP composites, however, have electrical resistance decrease with the increase of the number of cycles because of the plastic deformation of the angle-ply laminates.
Highlights
Carbon Fiber Reinforced Polymer (CFRP) is applied to aerospace structures and automobile structures because of its light weight, high strength and high stiffness
The ordinate is the electrical resistance change from the reference electrical resistance at 20 ̊C normalized by the reference resistance
1) A temperature compensation method is shown, and the method is applied to the long term cyclic loading test to distinguish the effect of the cyclic loading from the temperature change
Summary
Carbon Fiber Reinforced Polymer (CFRP) is applied to aerospace structures and automobile structures because of its light weight, high strength and high stiffness. That causes the requirement of self-sensing CFRP structures: the self-sensing CFRP uses the reinforcement carbon fibers as sensors [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. Wang and Chung [4] adopted a four-probe method to remove the electrical contact resistance at electrodes: the outer couple of electrodes is used to apply electric current and the inner couple of electrodes is used to measure electrical voltage change. Irving et al [6] and Seo et al [7] employed the self-sensing method to detect fatigue damage of the unidirectional CFRP and cross-ply CFRP. De Baere et al [15] used the self-sensing method for fatigue damage detection of woven fabric CFRP composites
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