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Prediction of the Onset of Failures in Composite Laminated Plates with Uncertain Material Properties

불확실한 물성치를 갖는 복합재료 적층 평판의 파괴 예측

  • Published : 2000.01.01

Abstract

Because of their superior mechanical properties to isotropic materials, composite laminated plates are used for many structural applications that require high stiffness-to-weight and strength-to-weight ratios. Composite materials are always subject to a certain amount of scatter in their elastic moduli, but most analyses and designs with the materials are usually conducted by assuming that the material properties are fixed and have no uncertainties. In this paper, a convex modeling approach is introduced to take account of such uncertainties in elastic moduli. It is used with the finite element method to predict the onset of failures in composite laminated plates subject to in-plane loading. Numerical results show that failures begin at the smaller load when the uncertainties of elastic moduli considered and therefore, such uncertainties should be considered at the design stage for the safety and reliability of the structures.

Keywords

Convex Modeling;Finite Element Method;Failure Criteria

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