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- 저자 : Yuder (검색결과 2 건)
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A genetic algorithm for the optimization of fiber angles in composite laminates
Shun-Fa Hwang,Ya-Chu Hsu,Yuder Chen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.8
A genetic algorithm for the optimization of composite laminates is proposed in this work. The well-known roulette selection criterion,one-point crossover operator, and uniform mutation operator are used in this genetic algorithm to create the next population. To improvethe hill-climbing capability of the algorithm, adaptive mechanisms designed to adjust the probabilities of the crossover and mutationoperators are included, and the elite strategy is enforced to ensure the quality of the optimum solution. The proposed algorithm includes anew operator called the elite comparison, which compares and uses the differences in the design variables of the two best solutions tofind possible combinations. This genetic algorithm is tested in four optimization problems of composite laminates. Specifically, the effectof the elite comparison operator is evaluated. Results indicate that the elite comparison operator significantly accelerates the convergenceof the algorithm, which thus becomes a good candidate for the optimization of composite laminates.
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Progressive failure of metal–composite hybrid wheels under impact
Shun-Fa Hwang,Hui-Lun Yu,Yu-Jen Liu,Yuder Chen,Shih-Chieh Chen,Yueh-Chih Hsieh 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
An 18-in hybrid wheel consisting of an aluminum alloy disk and a composite rim under 13° impact test is considered in this study. The rim is made of carbon fabric/polyurethane composites fabricated by resin transfer molding. Explicit finite element analysis with progressive failure function is used to investigate the failure situation of the hybrid wheel and the suitable braid angle of the braided composite. The effective elastic constants and strengths of the braided composites predicted by basic finite element analyses are adopted, whereas the true stress–strain curve of aluminum is used for the disk. Simulation results indicate that the aluminum alloy disk is safe after the impact test, whereas the rim is damaged. The volume of failed elements after impact simulation is selected as an indicator to obtain a quantity that can be used to represent the damage situation of the rim. Compared with the test results of a real hybrid wheel with [±30°] fiber angle in the rim, the hybrid wheel with fiber angle in the rim that is greater than [±30°] could pass the impact test.
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