Adaptive combined DE/FE algorithm for analyzing impact fracture problem
Adaptive combined DE/FE algorithm for analyzing impact fracture problem
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发表时间：
2015-05
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通讯作者：
Wei Xu;J. Sakamoto
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作者：
Wei Xu;J. Sakamoto
本文介绍了一种3D自适应组合DE/FE算法，该算法可以在模拟夹层玻璃冲击断裂时自动将变形有限元转换为球形离散元。在该方法中，系统在初始时刻完全离散为有限元，不存在任何离散元，直到部分有限元发生严重变形。随后，每个最大拉应力超过用户指定的转换标准的有限元被转换为八个球形离散元。同时，系统被分为两个子域：有限元（FE）子域和离散元（DE）子域。分别采用自适应算法和离散元法模拟玻璃梁的冲击断裂。仿真结果令人满意，验证了这种自适应算法的可行性；但自适应算法的计算效率远高于后者。
This paper presents a description of a 3D adaptive combined DE/FE algorithm which can automatically convert the distorted finite elements into the spherical discrete elements during simulating the impact fracture of laminated glass. In this method a system is completely discretized into the finite elements at the initial moment without any discrete element existing until part of the finite elements becoming severely deformed. Subsequently each finite element, whose maximum tensile stress exceeds a user-specified conversion criterion, is converted into eight spherical discrete elements. At the same time the system is fragmented into two subdomains, the finite element (FE) and the discrete element (DE) subdomains. The impact fracture of a glass beam is simulated by the adaptive algorithm and the discrete element method, respectively. A satisfactory agreement of the simulation results is observed which validates the feasibility of such an adaptive algorithm; however, the computational efficiency of the adaptive algorithm is much higher than that of latter.