Abstract
A general formulation for the reliability model of unidirectionally fiber reinforced laminate is developed. One of the major objectives of the present paper is to show a practical method of constructing the reliability-oriented materials design. The proposed formulation is developed based on six kinds of failure criteria which borrow features of the Mises's isotropic yield condition, Hill's orthotropic yield condition, maximum stress and strain criteria. For the evaluation of reliability of unidirectional fiber reinforced laminate, a reliability evaluation model was constructed by the First/Second Order Reliability Method(FORM/SORH). Numerical examples for graphite/epoxy laminate are shown for the comparative verification of failure criteria under the various co9bination of multiaxis load condition and lamination angles.
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