L字型擬似等方CFRP積層板の超音波式疲労試験法の提案と疲労特性評価

抄録

A method of performing ultrasonic fatigue tests on L-shaped carbon fiber reinforced plastic (CFRP) laminates was suggested in this study. Ultrasonic fatigue tests are generally conducted by resonating a specimen. In order to perform the ultrasonic fatigue tests, the specimens need to be resonant at a frequency of 20 kHz. The specimen geometry was determined based on the results of finite element analysis (FEA). The specimens were evaluated in terms of displacement and temperature experimentally whether the ultrasonic fatigue tests could be performed. It was confirmed that the specimens resonated and the curved section of CFRP laminates were subjected to higher stress. In the ultrasonic fatigue tests, delamination was observed in the curved section of CFRP laminates. Considering these results, the ultrasonic fatigue tests could be performed on L-shaped CFRP laminates. Although the bending and torsional deformation occurred analytically in the specimens, it was concerned that the influence of torsional deformation was small in terms of measuring displacement amplitude of the specimen end.