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《Journal of Vibration and Shock》 2015-22
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Evaluation method based on probability for energy-absorbing composite structures with uncertain parameters

XIE Jiang;FENG Zhen-yu;ZHAO Yan-qiang;MU Hao-lei;LI Han;Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance,Civil Aviation University of China;  
Due to the large deviation in material properties and inherent machining tolerance,uncertain factors should be considered in designing and evaluating composite energy-absorbing structures. An evaluation method for energyabsorbing characteristics of thin-walled composite structures with uncertain parameters was proposed and developed. Thinwalled composite tubes extensively applied in automobile and aircraft engineerings are typical crushable elements for absorbing collision energy. The uncertainties due to the machining tolerance on the thickness and inner diameter of tube were considered and represented through a probability model. The indices of Triggering Specific Load( TSL) and Specific Energy Absorption( SEA) were introduced and calculated by finite element analysis for indicating energy-absorbing characteristics of the specimen under quasi-static axial crushing. The Plackett-Burman method was used to choose measurement parameters. The response surface method was then used to build a second-order function of uncertain parameters versus TSL / SEA. The Monte Carlo method was used to obtain the probability of TSL and SEA. The results show that XC,h and XTsignificantly affect the SEA and XC,h and YCsignificantly affect the TSL.
【Fund】: 中国民航局科技项目(MHRD20140207);; 中央高校项目(ZXH2012B004)
【CateGory Index】: TB332
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