Static and Dynamic Analyses of Pure Bending Problems of Composite Plates using Non-Conforming 3-Dimensional 8-Node Solid Element

J. Ocean Eng. Technol. 1998;12(2):1-21.

Yun, Tae-Hyeok;Gwon, Yeong-Du;

Kyungpook National University;

3차원 8절점 비적합 고체요소에 의한 복합재판의 순수굽힘문제의 정적.동적해석

윤태혁;권영두;

경북대학교;

Keywords: Static Sondensation, Stiffness Stiffening Phenomenon, Modified Gauss Sampling Points, Non Conforming 3-Dimensional 8-Node Solid Elemental

핵심용어: 정적수축, 강성과잉현상, 가우스적분점수정, 비적합 3차원 8절점 고체요소

Abstract

In this paper, a non-conforming 3-D 8-node solid element(MQM10) has beets applied to the analyses of static and dynamic bending problems of laminated composite plates The QM10 element exhibits stiffer bending stiffness which is caused by the reduction of degree of freedom from Q11 element. As an effective way to correct the relative stiffness stiffening phenomenon the modification of Gauss sampling points for composite plates is proposed. The quantity of modification is a function of material properties. Also, another two modified equations are obtained, one is modification for stress, and the other is modification of coefficient of shear modulus in free vibration. It is noted that MQM10 element can analyse the static and free vibration problems of various 3-dimensional composite plates composed of unidirectional laminae, woven laminae or braided laminae. The results of MQM10 element are in good agreement with those of 20-node element.