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Structural Engineering and Mechanics Volume 11, Number 4, April 2001 , pages 443-460 DOI: https://doi.org/10.12989/sem.2001.11.4.443 |
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Variable-node axisymmetric solid element and its application to adaptive mesh refinement |
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Chang-Koon Choi, Eun-Jin Lee and Wan-Hoon Lee(Korea)
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| Abstract | ||
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This paper presents an effective application of a variable-node axisymmetric solid element designated as AQV (Axisymmetric Quadrilateral Variable-node element). The variable-node element with physical midside nodes helps to overcome some problems in connecting the different layer patterns on a quadrilateral mesh in the adaptive h-refinement. This element alleviates the necessity of imposing displacement constraints on irregular (hanging) nodes in order to enforce the inter-element compatibility. Therefore, the elements with variable mid-side nodes can be used effectively in the local mesh refinement for the axisymmetric structures which have stress concentrations. A modified Gaussian quadrature should be adopted to evaluate the stiffness matrices of the variable-node elements mainly because of the slope discontinuity of assumed displacement within the elements. Some numerical examples show the usefulness of variable-node axisymmetric elements in the practical application. | ||
| Key Words | ||
| quadrilateral axisymmetric element; irregular node; variable-node element; transition element; adaptive h-refinement. | ||
| Address | ||
| Chang-Koon Choi and Eun-Jin Lee, Department of Civil Engineering, KAIST, Taejon 305-600, Korea Wan-Hoon Lee, Department of Civil & Environment Engineering, Chungwoon University, Chungnam 350-701, Korea | ||