為了瞭解異種金屬之摩擦攪拌點銲搭接的溫升與塑性流動速度，本研究建立一適用於內嵌式工具之數值模型，並與實驗結果互相比對，驗證理論模型的正確性。首先，先進行鋼/鋼搭接之模擬，計算工件溫度與塑性流動速度之歷程，點銲初期理論計算之溫昇速率較實驗值大，此乃因為實驗初期工具與工件之貼合度不佳，之後隨著貼合度變佳兩者之溫度逐漸一致。鋼/鋁搭接與鋁-鋼搭接之模擬，計算工件溫度與塑性流動速度歷程，由比較鋼/鋼搭接與鋼-鋁搭接，可以得知由於鋁板熱傳導係數約低碳鋼2.6 倍，因此單位時間內溫升速率較慢，溫度也較低，隨著鋁板的厚度越厚，鋼/鋁接合面的溫度會越低且塑性流動的範圍會越窄，一般而言，上下板熱傳導係數越大，接合面溫度就會越低，且需要更高的轉述以及擠壓力量來達到相同的介面溫度

. In order to understand the temperature rise and the plastic flow of the workpiece in the friction stir spot lap welding (FSSLW) of dissimilar metals, a numerical model suitable for the embedded tool is established in this study. Theoretical results are compared with that of experimental measurements to verify the theoretical model. First, the simulation for the steel on steel FSSLW is conducted to calculate the time histories of the temperature rise and plastic flow of the workpiece. Results show that the rate of temperature rise is larger than that of measured one at the initial stage of FSSLW due to the fitting degree between tool and workpiece in the experiment, but they are consistent with each other after that. Comparison of steel/aluminum and aluminum/steel FSSLW, results show that the rate of temperature rise of steel/aluminum is slower than that of steel/steel since the thermal conductivity of aluminum is 2.6 times as large as that of low-carbon steel. With the thicker aluminum plate, the faying surface temperature between the steel and aluminum is lower than that of thinner one, and narrower range of plastic flow. In general, the higher thermal conductivity for both upper and lower plates would lower the faying surface temperature, and they need to use the higher rotating speed and the higher downward to achieve the same surface temperature.

審定書 i
致謝 ii
摘要 iii
ABSTRACT iv
圖目錄 vi
表目錄 vii
第一章 緒論 1
1.1 摩擦攪拌銲接概論 1
1.2 文獻回顧 2
1.3 研究目的 4
1.4 論文架構 5
第二章 論模型 6
2.1圓柱座標系 6
2.2銲接工具種類 7
2.3 熱傳模型 8
2.4 黏度模型 11
2.5 材料塑性變形產熱 13
2.6 材料塑性流動模型 15
2.7 試片上表面速度與溫度之計算 16
2.8 有限差分法 17
第三章 果與討論 24
3.1與實驗比較並探討不同銲接工具對溫度與速度之影響 26
3.2與實驗比較並探討鋼/鋼搭接之溫度歷程與塑性流動 27
3.2與實驗比較並探討不同鋁板厚度對溫度之影響 29
3.3與實驗比較並探討鋁/鋼搭接之溫度歷程與塑性流動 32
3.4不同熱傳導係數對溫度之影響 33
第四章 論 35
4.1 結論 35
4.2 未來展望 36
參考文獻 37

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