CFRP積層板の落錘衝撃損傷と温度変化の測定

抄録

A composite material called Carbon Fiber Reinforced Plastic (CFRP), one of the advanced materials, is lighter, higher strength and higher rigidity than iron. However, it is weak against impact, internal damage such as delamination occurs, and the mechanical properties may decrease. It is difficult to evaluate damage and to distinguish by external inspection. CFRP is known to generate heat when CFRP is subjected to impact loading and fracture. In the present study, the CFRP laminate was subjected to falling weight impact loading and the temperature change of the CFRP laminate at impact loading was measured by infrared thermography. In addition, we investigated the relationship between internal damage and temperature distribution and investigated the possibility of non-destructive inspection for falling weight impact damage within CFRP laminate. As a result, CFRP laminate generated heat with failure. The maximum temperature of heat generation increased as the impact energy increased. The longer the crack length, the larger the heat generation area and the larger the heating value. As the number of cracks increased, the heating value increased. Therefore, there was a clear relationship between heat generation and internal damage of CFRP, and it was confirmed that internal damage can be evaluated from the change of temperature distribution.