Abstract
An experimental method was developed in order to evaluate the mixed mode (I+II) impact fracture toughness for CFRP (Carbon Fiber Reinforced Plastic) adhesive joints using ramped incident wave. The MMF (Mixed Mode Flexure) specimen was employed for the evaluation of energy release rate. The dynamic response of the specimen was studied on the basis of computational results using finite element method. In the impact fracture toughness test, the SHPB (Split Hopkinson Pressure Bar) system was used for studying the dynamic response of the specimen. When a slow gradient ramped incident stress wave was applied to the specimen, bending vibration of the specimen was suppressed, and consequently dynamic energy release rate could be evaluated more precisely. Energy release rate could be estimated more precisely with the formula based on the surface strain of the specimen, whereas vibration was overestimated with the formula based on reaction force at loading point.
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