衝撃負荷を受ける積層材料に対する破壊制御設計の体系化に関する一考察

摘要

CFRP（Carbon Fiber Reinforced Plastics；炭素繊維強化rnプラスチック）積層材料に代表される先端積層材料は，rn航空宇宙分野をはじめとする幅広い分野で使用されてrnいる．今後，構造部材を主として更なる積層材料の大rn幅導入が期待される．%In recent years, the laminated materials are designed and used widely in aerospace applications, for example. Therefore, it is important to evaluate the fracture characteristic of the laminated materials. In this research, the basic study on fracture control design for the laminated materials subjected to impact load is systematized. The dynamic fracture behavior is analyzed by using the high speed video camera and the digital image correlation method. The dynamic stress intensity factor is experimentally calculated based on interfacial mechanics. In addition, the mixed-mode ratio, dynamic fracture toughness and kinking angle are evaluated from the dynamic stress intensity factor for the control and forecast of fracture. And. the characteristic of mixed mode fracture criterion showing the condition and the behavior of fracture is examined. It is shown to be able to properly act as fracture control design by the materials evaluation method.