Kinetics of Failure Rate Accumulation and TiNi Shape Memory Effect Alloy Fracture Under Mechanical Cycling |
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Authors: | A B Bondarev M A Khusainov G V Plastilina V A Andreev |
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Affiliation: | (1) Industrial Centre MATEKS Ltd, Moscow, Russia;(2) Yaroslav the Wise Novgorod State University, Novgorod the Great, Russia; |
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Abstract: | Wire specimens, d = 0.1 mm, made of Ti-(50.6-50.8)at.%-Ni alloy were exposed to thermo-mechanical treatment (TMT), thus making the samples
straight and providing them with high superelasticity (εse). It was established that the most effective method of TMT is annealing with deformation at 500 and 300 °C. The optimum mode
of treatment was used in the research of mechanical fatigue of alloys with high superelastic properties. Two stages characterizing
the alloy behavior under mechanical cycling were found out: failure accumulation and fracture. It was shown that the duration
of the cycles is determined by the value of the preset deformation (σset) in relation to the deformation on the plateau-shaped area. The results of low-cycle fatigue of the alloys under investigation
were processed by means of the method of least squares. The equations of prognosis of longetivity at the preset level of deformation
are presented. |
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Keywords: | |
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