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EXPERMENTAL STUDY ON TRANSFORMATION RATCHETING OF SUPERELASTIC NITI ALLOY |
Qian-Hua Kan;Guozheng Kang;;; |
西南交通大学 |
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Cite this article:
Qian-Hua Kan; Guozheng Kang. EXPERMENTAL STUDY ON TRANSFORMATION RATCHETING OF SUPERELASTIC NITI ALLOY. Acta Metall Sin, 2008, 44(8): 949-955 .
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Abstract ABSTRACT: Under stressing-controlled cyclic loading, the cyclic accumulation of peak strain and valley strain, denoted as transformation ratcheting, takes place in superelastic NiTi alloy. In this work, the transformation ratcheting behavior of superelastic NiTi alloy and its dependence upon load condition were studied by experiments at room temperature. The evolution rules of peak strain, valley strain, nominal elastic modulus and transition stress under different cyclic loading cases were discussed. It is shown that the alloy presents apparent transformation ratcheting, and the value of transformation ratcheting strain and its evolution rule depend greatly upon the applied stress amplitude, mean stress and loading charts; in the meantime, the nominal elastic modulus of austenite, nominal starting stress for the transformation from austenite to martensite and dissipation energy decrease, while nominal elastic modulus of martensite increases with the increase in the number of cycles, and then reach a steady state after certain cycles. Some significant conclusions are obtained, which are useful to establish a constitutive model describing the transformation ratcheting of the material.
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Received: 23 November 2007
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