Abstract

A great deal of attention has been devoted to the adaptive structure and composite materials constituting shape memory alloys (SMAs), especially for suppressing vibration. This requires a comprehensive understanding of the damping characteristics and other mechanical properties of SMAs. This paper focuses on the dynamic properties of various SMAs including NiTi, Ti(Ni-15at%Pd), and Ni(Ti-20at%Hf) higher temperature SMAs which have been systematically studied using a dynamic mechanical analyzer. The elastic modulus and damping characteristics have been measured as a function of temperatures during cooling and heating processes for Ni-51.0at%Ti, Ti(Ni-15at%Pd), and Ni(Ti-20at%Hf) alloys. The influence of dynamic factors, such as vibration frequency, ramp rate, and amplitude, on the damping and elastic modulus were systematically studied for Ni-51.0at%Ti alloy. The thermoelastic damping in the vicinity of the forward and reverse transformation also are discussed.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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