Abstract
Carbon Fiber Reinforced Plastic (CFRP) laminates are weak in durability against impact load, and it yields internal damage like delamination cracks. The electrical resistance change method (ERCM) is useful for CFRP structures, because electrical conductivity of carbon fiber can be used as a sensor for damage detections. Many researchers detect various kinds of damage of CFRP laminates by using the ERCM. However, the method has unsolved issues such as an effect of temperature change and an effect of cyclically loading in service. This study experimentally deals with the effects on the ERCM. At first it was revealed that the relationship between temperature and electrical resistance change was almost linear. This means that temperature compensation for temperature distribution is possible using the linear relationship. Moreover, it was investigated that the temperature coefficient depends on a fatigue of CFRP. Finally, temperature change was observed in fatigue tests, therefore electrical resistance is formulated as constant temperature. As a result, the electrical resistance decreases with the increase of number of cycles.
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