在目前電子產品中，由於40/60鉛錫合金同時具有低成本與適當的性質，因此，該合金一直被用於接著材料，也是在現代電子工業中，使用最廣的焊接劑材料，該合金所製成的錫球是高階IC構裝中不可或缺的重要材料。對於40/60錫球合金而言，製程中或是使用的過程中，常常會有產生應力或是應變，而在長期的使用下，也會發生潛變變形的行為，然而這些變形進一步都會影響到產品的效能，所以該合金相關力學行為的瞭解對電子工業是相當重要的課題。
　　針對40/60鉛錫合金相關力學行為的理論分析，本文是利用內涵時間彈-塑性理論，並提出內涵時間刻度中的溫度-加載率敏感函數以及純量函數的溫度相關材料參數，來分析40/60錫球合金在變動溫度或是變動加載率下的黏塑性及潛變變形的力學行為。本文中所要描述的力學行為包含有：不同加載率下的單軸張力負載行為，不同溫度下的單軸張力負載行為，變速率下的單軸張力負載行為，不同加載率下的單軸循環張力—壓力負載行為，不同溫度下的單軸循環張力—壓力負載行為，變速率下的單軸循環張力—壓力負載行為，以及不同溫度下的潛變行為。由實驗結果和電腦模擬出的理論值比較後可知，理論能適當且合理的描述實驗結果。

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