Axisymmetric solid-of-revolution elements based on the assumed stress hybrid model
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A series of axisymmetric solid-of-revolution elements with 8-node and quadrilateral cross section have been developed based on the assumed stress hybrid model. A quadratic boundary displacement assumption is employed for each element and a variety of interior stress assumptions have been made. Two different kinds of procedure used for developing stress field have been studied. Example problems of a thick-walled cylinder under internal pressure and a thick-walled sphere under internal pressure are utilized to evaluate the various elements and a desirable stress assumption has been identified. Comparisons of present results with those obtained by the use of 8-node element based on the assumed displacement model indicate that this hybrid stress element is far superior in predicting the stress distribution.
Key Wordsaxisymmetric hybrid stress method solid-of-revolution element kinematic deformation mode invariance
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