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標題: 鎳鈦形狀記憶合金線於熱機V型彎曲成形及其形狀記憶效應研究
Study on Shape Memory Effect in Thermomechanical V-Bending of Ni-Ti Shape Memory Alloy Wire
作者: 徐豪志
Hsu, Hau-Chi
關鍵字: 形狀記憶合金;Shape memory alloy;熱機成形;V型彎曲成形;應力鬆弛;有限元素分析;Thermomechanical process;V-bending;Stress relaxation;Finite element analysis
出版社: 機械工程學系所
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The aim of this study is that shape memory treatment and V-bending process for nickel-titanium alloy wire are able to be accomplished within one thermomechanical process at high temperature. This method could provide an alternative choice for the nickel-titanium shape memory alloy wire to reduce the spring-back in V-bending process due to the creep effect. In this study, the influences of forming temperatures and process time on spring-back were studied. Furthermore, experiment was carried out to verify with the finite element analysis results. The material model used in finite element analysis was based on the mechanical properties of nickel-titanium alloy obtained by material testing. The results showed that the reduction of spring-back was more obviously when the forming temperature was increased. Spring-back could also reduce when the process time was long which resulted in stress relaxation due to the creep effect. In addition, to understand the effects of forming temperatures and process time on the phase transformation temperature, its measurement was executed by the DSC equipment. The testing of shape recovery rate of nickel-titanium alloy was conducted and the rate was more than 99%. Accordingly, the results of this study could offer a reference for the industry to improve the spring-back of V-bending process.
其他識別: U0005-2908201315343600
Appears in Collections:機械工程學系所

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