Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2925
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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摘要: 
本研究採熱機成形之方法,將鎳鈦合金線之形狀記憶處理及彎曲成形結合為一製程,且藉熱機製程使鎳鈦合金產生潛變效應,減少彎曲成形後之回彈量,提供鎳鈦合金成形製程的另一選擇;其中將成形溫度與處理時間設為製程因子,藉由實驗得出製程因子對回彈量之影響。同時,本研究藉材料試驗法得鎳鈦合金材料的相關熱機特性資料,建立鎳鈦合金於有限元素軟體之材料模型,藉有限元素模擬解釋成形溫度與處理時間對回彈量之影響。由實驗及有限元素模擬之結果得出,當成形環境溫度越高時,其有效減少成形後回彈量之產生;當成形時處理時間越長,其使鎳鈦合金材料因潛變效應,而產生應力鬆弛,藉此降低成形後之回彈量。另外,本研究將熱機成形後之鎳鈦合金工件使用DSC量測其相變態溫度,藉此了解成形溫度及處理時間對相變態溫度之影響;最後,另有將熱機成形後之鎳鈦合金工件進行形狀恢復率之測試,其形狀恢復率達99%以上。文中所建立的熱機V型彎曲成形製程,成功地減少鎳鈦合金線成形後之回彈量,其成果足供相關業者改善現況。

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.
URI: http://hdl.handle.net/11455/2925
其他識別: U0005-2908201315343600
Appears in Collections:機械工程學系所

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