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류한선,김지훈,이명규,김돈건,이형림,정관수,윤재륜,강태진,Ryou Hansun,Kim Ji Hoon,Lee Myoung-Gyu,Kim Dongun,Lee Hyung Rim,Chung Kwangsoo,Youn Jae Ryoun,Kang Tae Jin The Korean Fiber Society 2005 한국섬유공학회지 Vol.42 No.5
In order to describe the mechanical behavior of highly anisotropic and asymmetric materials such as fiber reinforced composites, the elastic-plastic constitutive equations were used based on the recently developed yield criterion and hardening laws. As for the yield criterion, modified Drucker-Prager yield surface was used to represent the orthotropic and bi-modular (asymmetric) properties of composite materials, while the anisotropic evolution of back-stress was used to account for the hardening behavior. Experimental procedures to obtain the material parameters of the hardening laws and yield surface are presented for 3D braided glass fiber reinforced composites. For verification purposes, finite element simulation results based on the proposed constitutive laws have been compared with measurements for the three point bending tests.
비이차 비등방 항복함수를 이용한 리튬-이온 배터리 파우치의 이방성 및 성형성 예측
김재승(J. S. Kim),문찬미(C. M. Moon),이형림(H.R. Lee),이명규(M. G. Lee) 한국소성·가공학회 2023 소성가공 : 한국소성가공학회지 Vol.32 No.3
This study analyzed the mechanical behavior of lithium-ion battery pouch material and predicted its formability. A homogenization method was used to evaluate the physical properties of the pouch, and a new hardening model was developed. The yield function for the plastic model was optimized, and the anisotropic property was determined. Also, the forming limits were measured and predicted using the M-K forming limit diagram. Finally, a square cup drawing experiment confirmed the accuracy of the measured mechanical properties and the formability calculation.