應用鎂鋰合金於摺疊式電動自行車結構之研究

本研究導入輕金屬鎂鋰合金材料ALZ821進行摺疊式電動自行車車架結構之設計。低密度鎂鋰合金材料首次應用於載具結構之輕量化設計上，故本研究利用有限元素方法進行車架設計，且利用修改車架外型幾何設計以及提升管件截面慣性矩之方法，改善鎂鋰合金楊氏模數不如一般金屬材料之情形。接著利用分析檢驗車架於輕量化後剛性與強度是否達到法規需求。本研究於設計過程中加入鋁合金材料AL6061-T6，在車架外型與剛性相同情況下，鎂鋰合金車架較鋁合金車架輕25%之重量，最後與市售自行車車架在相同負載下進行比較，鎂鋰合金在重量、剛性以及強度上也具有優勢。結果顯示以鎂鋰合金材料配合設計方法進行輕量化的效果突出，期盼未來鎂鋰合金能更廣泛的應用於載具結構上，以節省能源的浪費。

關鍵字

鎂鋰合金；摺疊式電動自行車；輕量化設計；有限元素分析

並列摘要

In this research, magnesium-lithium alloy (Mg-Li alloy) was introduced into the frame of folding e-bike. The material of Mg-Li alloy was firstly applied on light-weighting structure for vehicles. The frame was designed with the help of finite element method (FEM). It is found that optimizing the geometric outline with improved the moment of inertia can make up for the Young’s modulus of Mg-Li alloy, which is considered to be lower than other alloys used on bike. Also, the stiffness and the strength will be examined to check if it reaches the regulation of standard. Implementing aluminum alloy AL6061-T6 in the frame of Mg-Li alloy, the weight can be reduced by 25%, under the condition that the outline and stiffness are the same on both frame. Comparing the frame to others under the same loading, Mg-Li alloy has the edge on stiffness, strength, and weight. The progress is remarkable to implement Mg-Li alloy and new design method. The material is expected to be widely applied on structure of vehicles in order to save more resources.

並列關鍵字

magnesium-lithium alloy ； folding e-bike ； light-weighting ； finite element method

參考文獻

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國際替代計量

應用鎂鋰合金於摺疊式電動自行車結構之研究

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