Browsing by Author "Chang, ES"

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Reliability assessment of laminated composite plates with random strength parameters
(1999-12-01)
Kam, TY
;
Chu, KH
;
Chang, ES
;
機械工程學系
;
Department of Mechanical Engineering
A method is presented for the reliability assessment of transversely loaded laminated composite plates with random strength parameters. The proposed method is constructed on the basis of the first-ply failure method and the series system hypothesis. The first-ply failure analysis of a laminated plate is achieved via the use of a phenomenological failure criterion and the finite element method. In the reliability analysis, the independent (maximum stress) as well as the dependent (Tsai-Hill) failure criteria are used to establish the limit state equation; a direct numerical integration method together with the series system hypothesis are adopted to compute the reliability of the plate. Experimental investigations of lamina strength distributions and first-ply failure of laminated composite plates were performed. It has been found that lamina strengths and first-ply failure load can be well fitted by Weibull distributions. The baseline probability distributions of lamina strength parameters determined from the tests are then used in the reliability analysis of the laminated composite plates. The accuracy of the proposed method in reliability prediction of the laminated composite plates of different sizes is verified against the experimental results.
Reliability formulation for composite laminates subjected to first-ply failure
(1997-05-01)
Kam, TY
;
Chang, ES
;
機械工程學系
;
Department of Mechanical Engineering
Methods formulated on the basis of the concept of first-ply failure and the structural reliability theory are presented for the reliability analysis of laminated composite plates. In the reliability formulation, an appropriate phenomenological failure criterion is used to establish the limit state equation of the laminated composite plates, and different numerical techniques are employed to evaluate the reliability of the plates. Experimental investigations of lamina strengths and first-ply failure loads of laminated composite plates were performed. Baseline probability distributions of lamina strength parameters constructed from the test data are used to study the reliability of the laminated plates. The accuracy of the proposed models in reliability assessment of the laminated plates are verified by the experimental results on first-ply failure load distributions. (C) 1997 Elsevier Science Ltd.