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Crack Band Model을 이용한 탄소섬유강화 복합재료 적층판의 점진적 파손거동에 관한 연구
윤동현(Donghyun Yoon),김상덕(Sangedeok Kim),김재훈(Jaehoon Kim) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.5
In this paper, a progressive failure analysis was developed using the Hashin failure criterion and crack band model. Using the failure criterion, the failure initiation was evaluated. If the failure initiation is occurred, the damage variables at each failure modes (fiber tension & compression, matrix tension & compression, matrix tension & compression) was calculated according to linear softening degradation behavior and the variables are used to derive the damaged stiffness matrix. The damaged stiffness matrix is reflected to degraded material and the progressive failure analysis is continued until the damage variables to be 1 that compete failure of material. A series of processes were performed using FE commercial code ABAQUS with user defined material subroutine (UMAT). To evaluate the proposed progressive failure model, the experimental results of open hole composite laminate tests was compared with numerical result. Using digital image correlation system, the strain behavior also was compared. The proposed numerical results were coincided well with the experimental results.
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