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| Development of an Evaluation Method Base on the Probability for Energy-Absorbing Composite Structures with Uncertain Parameters |
| Xie Jiang Feng Zhenyu Zhao Yanqiang Mou Haolei Li Han |
| Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300 |
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Abstract Due to the large deviation of material properties and inherent machining tolerance, uncertain factors should be considered for designing and evaluation composite Energy-Absorbing structures. An evaluation method for energy-absorbing characteristics of thin-walled composite structures with uncertain parameters was proposed and developed herein.Thin-walled composite tubes extensively applied on automobile and aircraft are typical crushable elements for absorbing collision energy. The uncertainties due to machining tolerance from thickness and inner diameter of a tube were considered in the present paper and represented by probability model. Triggering Specific Load(TSL) and Specific Energy Absorption (SEA) are concerned and calculated by Finite Element Analysis for indicating energy-absorbing characteristics of the specimen under quasi-static axial crushing. Plackett-Burman method was used to choose parameters. Response surface method was then used to build a second-order function between uncertain parameters and TSL/SEA. At last Monte Carlo was used to obtain the probability of TSL and SEA . The results showed that, XC、h and XT significantly affect the SEA, XC、h and YC significantly affect the TSL.
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Received: 20 March 2015
Published: 25 November 2015
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