LOCKING-FREE DEGENERATED ISOPARAMETRIC SHELL ELEMENT

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LOCKING-FREE DEGENERATED ISOPARAMETRIC SHELL ELEMENT

An 8-noded locking-free degenerated isoparametric shell element is presented.A revised interpolation for shear strain terms was constructed in natural co-ordinate system such that all necessary modes ( translation, rotation and constant curvature ) are preserved,which can be used to eliminate shear locking. A revised interpolation for membrane strains was produced in the local Cartesian co-ordinate system to overcome membrane locking behavior. The new 8-noded element has the proper rank, with the requisite number of zero eigenvalues each associated with a rigid mode. The element does not exhibit membrane or shear locking for large span-thickness ratio. The element does not form element mechanisms or extra spurious zero energy modes. Therefore, it can be used for both thin and thick shells.

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作 者: 章向明 王安稳 何汉林  
作者单位:Department of Basic Courses, Naval University of Engineering, Wuhan 430033, P R China 
刊 名:应用数学和力学(英文版)  EI SCI
英文刊名:APPLIED MATHEMATICS AND MECHANICS(ENGLISH EDITION) 
年,卷(期):2001 22(5) 
分类号:O242 
关键词:degenerated isoparametric shell element   shear locking   membrane locking   finite element  
机标关键词:shear lockingconstant curvaturemembrane lockingshear strain 
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