Study on Self-adaptive Trigger Mechanism of Composite Tubes
The trigger mechanism is a key technology to the ability of energy absorption of composite structures.Proper design of trigger geometry can make composite structures crushed stably and gradually thus absorb more energy.In this paper,the self-adaptive trigger is presented by embedding with pre-strained SMA wire in glass/epoxy composite tubes.Since the pre-strained SMA wire will shrink back to its original length when it is heated to the transformation temperature,consequently cause the local deformation to form a trigger mechanism.Several composite tubes with and without SMA wires are fabricated and then tested to failure in compression at room temperature.The tubes with SMA wires are also tested in austenite phase.Test results indicate that SMA self-adaptive composites can offer a slight increase in the strain energy absorption,thereby improve the crashworthiness.A significant decrease of peak load is also observed for the selfadaptive composite tube when the wires are transformed from the martensite to the austenite phase by heating.The local deformation of SMA-triggered composite tube is analyzed with the FE software.Numerical results indicate that SMA can form a trigger mechanism.Therefore,one may conclude that the SMA self-adapted trigger can improve the ability of energy absorption of composite tubes.
SMA Trigger mechanism Energy absorption
GONG Jun-jie WANG Xin-wei WANG Xin-feng GONG Jun-jie
College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,China College of Mechanics Engineering,Yangzhou University,Yangzhou,China
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）