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Xu L.,Key Laboratory of Advanced Composites | Xu L.,Tianjin Polytechnic University | Wang R.,Key Laboratory of Advanced Composites | Liu Y.,Key Laboratory of Advanced Composites
International Journal of Advanced Manufacturing Technology | Year: 2011

In this paper, the mechanical properties of the Ni-50.5 at.%-Ti alloy super-elastic wires manufactured by a conditioned multi-passed process of annealing and cold-drawing have been studied. The annealing temperature of 450~800°C, time of 20 min~3 h and the cold-drawing amount of 6.9%~39% were chosen. Their effects on the thermo, mechanical, and surface morphology of the Ni-Ti wires have been studied. The differential scanning calorimetry and tensile-recovery tests were adopted to obtain the phase transformation temperatures and mechanical hysteresis of the Ni-Ti SMA wires with different treatment conditions. The results show that the phase transition temperature of Ni-Ti wire can be changed by varying the annealing temperature and time; cold-drawing deformation and subsequent annealing have a great influence on the super-elasticity. The process with 39% cold-drawing amount, 600°C and 20 min annealing is shown to be effective in the manufacturing. © 2010 Springer-Verlag London Limited.


Lei X.,Tianjin Polytechnic University | Rui W.,Tianjin Polytechnic University | Rui W.,Key Laboratory of Advanced Composites | Shujie Z.,Tianjin Polytechnic University | And 2 more authors.
Journal of Composite Materials | Year: 2011

We study the effects of woven structures on the vibration properties of the composites. Five typical weaving sets including the ordinary plain weaved and the warp interlocked were adopted in fabric processing. The composites plates with adequate thickness were prepared by epoxy resin curing, and their fiber volume fractions were examined. Dynamic mechanical analyzer and vibration test technique were used to reveal the dynamical behaviors of specimens in different frequencies of vibration. The result showed that the woven structure have a strong effect on the fiber volume fraction, resin-rich area, and the warp architectures of the composites, which determine the performances of the composites in vibration. © The Author(s) 2010.


Lei X.,Key Laboratory of Advanced Composites | Lei X.,Tianjin Polytechnic University | Rui W.,Key Laboratory of Advanced Composites | Yong L.,Key Laboratory of Advanced Composites | Jin L.,Tianjin Polytechnic University
Defence Science Journal | Year: 2011

We study the effects of woven structures on the dynamic mechanical properties and vibration properties of the fabric composite plates. Five typical weaving sets including the ordinary plain weaved and the warp interlocked were adopted in fabric processing. The composite plates with the same thickness were prepared by epoxy resin curing, and their fibre volume fractions were examined. Dynamic mechanical analyzer and vibration test technique were used to reveal the dynamical behaviours of specimens in different frequencies of vibration. The storage modulus, the loss tangent, the natural frequency and damping ratio were obtained. The result showed that the woven structure had a strong effect on the fibre volume fraction, resin-rich area and the warp architectures of the composites, which determined the performances of the composites in vibration. © 2011, DESIDOC.

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