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Experimental Study about Transformation Ratcheting and Its Constitutive Description of NiTi Shape Memory Alloy

Author: WangHaiLin
Tutor: KangGuoZheng
School: Southwest Jiaotong University
Course: Solid Mechanics
Keywords: Super- elastic NiTi alloy Shape memory NiTi alloy Cyclic loading Stress control Phase change ratchet behavior Constitutive model
CLC: TG139.6
Type: Master's thesis
Year: 2009
Downloads: 50
Quote: 0
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Abstract


NiTi shape memory alloy its unique superelasticity , shape memory properties and good biocompatibility concern , has been widely used in the field of medical surgical , aviation and MEMS . Because of the particularity of the shape memory alloys in engineering applications , their work environment and more in the loop thermodynamic load one of its manifestations is reciprocating loading and unloading . Super elastic NiTi alloy in cyclic loading and unloading process of stress-induced martensitic transformation and reverse transformation , and shape memory NiTi alloys continue to occur in the cyclic loading and unloading process of redirection and elastic unloading of the stress-induced martensite . With the increase in the times of the cycle , the characteristic parameters and the phase transition behavior of the material will also change . It should be noted , existing studies are under strain - controlled cyclic loading conditions not related to the cyclic deformation behavior under stress control . In order to be able to improve the design of shape memory alloy active elements and to assess its reliability , it is necessary to carry out the experimental study of the cyclic deformation behavior of NiTi shape memory alloy under stress control , and the constitutive description . This paper carried out the research work as follows : (1) the super- elastic NiTi alloy peak stress of 450MPa , 500MPa , 550MPa under tensile uninstall cyclic deformation experimental study , discuss different loading conditions the stress-strain curve of the material , Austria 's body on behalf of the elastic modulus , peak strain and residual strain and dissipated energy variation . (2) the shape memory NiTi alloy peak stress 240MPa , 470 MPa , 600MPa and 700MPa under tensile uninstall cyclic deformation experimental study , four different loading conditions the stress-strain curve of the material , the peak strain Valley the value strain and dissipation of energy variation . (3) phase change ratcheting behavior of super-elastic NiTi alloy constitutive description . By comparison with the experimental results show that the proposed constitutive model of super- elastic NiTi alloy phase transition the ratchet behavior gives better prediction results .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Other special nature of the alloy > Shape Memory Alloys
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