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dc.contributor.authorHsu, Hau-Chien_US
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dc.description.abstractThe 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.en_US
dc.description.tableofcontents誌謝 摘要 i Abstract ii 目錄 iii 表目錄 v 圖目錄 vi 符號表 x 1 前言 1 1.1 文獻回顧 2 1.1.1 生醫用扣釘 2 1.1.2 形狀記憶合金 3 1.1.3 V型彎曲 8 1.1.4 金屬塑性變形 10 1.1.5 回彈 12 1.1.6 鎳鈦合金熱機成形與彎曲成形 15 1.2 研究目的與方法 18 2 實驗設定 19 2.1 V型熱機彎曲成形實驗設備 19 2.2 實驗設定 23 2.3 材料拉伸試驗 25 3 有限元素模擬分析 27 3.1 鎳鈦形狀記憶合金於材料模型 27 3.2 分析模型建構 34 4 結果與討論 37 4.1 彎曲成形之負荷變化 37 4.2 形狀記憶處理之負荷變化 43 4.3 回彈量之變化 45 4.4 相變態溫度之變化 50 4.5 形狀恢復率 56 5 結論 58 6 參考文獻 60 附錄A 成形模具 64 附錄B 彎曲成形上死點 68 附錄C 形恢復率實驗 69 附錄D 有限元素分析結果之圓角量測 73 附錄E 45°熱機彎曲成形與記憶處理 74 附錄F DEFORM應變率設定值對模擬結果之影響 78 附錄G 彎曲部位軸向應力分布 80 附錄H 回彈實驗值 86 附錄I 酸洗 89 附錄J DSC量測圖 90zh_TW
dc.subjectShape memory alloyen_US
dc.subjectThermomechanical processen_US
dc.subjectStress relaxationen_US
dc.subjectFinite element analysisen_US
dc.titleStudy on Shape Memory Effect in Thermomechanical V-Bending of Ni-Ti Shape Memory Alloy Wireen_US
dc.typeThesis and Dissertationzh_TW
item.openairetypeThesis and Dissertation-
item.fulltextno fulltext-
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