評估電子構裝中不同材料間之界面黏著力，為評估電子構裝可靠度之重要課題；若界面黏著強度不足，在遭受溫度或外力負載時，界面間之脫層破壞，將嚴重影響構裝體之可靠度。本研究引用雙材料界面破壞力學觀念，以數值模擬搭配實驗來評估構裝中銀膠與晶片間之界面黏著強度，以判斷發生脫層破壞之可能性。
根據線彈性雙材料界面破壞力學，裂縫尖端臨界能量釋放率會隨著裂縫尖端之負載相角而變化。考慮構裝體中銀膠與晶片交界面存在微小界面裂縫，以精緻混合型(CMM; compact mixed-mode )夾具進行實驗，並搭配ANSYS進行有限元素分析求得實際構裝體中所對應之相角及臨界能量釋放率。

It is an important topic for electronic packages to estimate the interfacial bonding strength between dissimilar materials. If it is not strong enough, delamination would arise easily under high temperature, vibration or collision. Its reliability will be reduced. The study on interfacial fracture behavior between epoxy resin and die based on experimental and numerical analyses is investigated, and it is useful to judge where the delamination happens . In terms of interfacial fracture mechanics, the critical strain energy release rate (G ) of crack tip is related to the phase angle (ψ ) . Considering the interface of the epoxy /die existing a tiny crack, the compact mixed mode (CMM) fixture is used to decide the critical load . Finally , we adopt the finite element method to calculate that the critical strain energy release rate (G ) and the phase angle (ψ ) in comparison with empirical results .

目錄
摘要…. I
英文摘要…………………………………………………………… II
目錄…. ……. III
圖、表目錄 VI
第一章 導論 1
1.1前言 1
1.2研究動機 3
1.3文獻回顧 4
1.4研究流程與方法 6
第二章 理論分析 7
2.1雙材料界面破壞力學 8
2.1.1界面裂縫之負載相角與能量釋放率 8
2.2 ANSYS軟體介紹 12
2.2.1 以奇異性元素模擬雙材料裂縫問題…………………. 13
2.3破壞準則 17
第三章 界面破壞軔度的量測 20
3.1實驗方式評估 20
3.2實驗試片 22
3.2.1試片樣式 22
3.2.2試片製作 22
3.3實驗儀器 24
3.3.1實驗步驟 24
第四章 實驗結果與討論 26
4.1實驗目的與方法 26
4.2實驗結果 26
4.3實驗結果討論---試片三 27
第五章 構裝體數值模擬 29
5.1 J積分的使用及相角選取……………………………………..29
5.2 ANSYS內建KI及KII的求法……………………………….30
5.3 範例計算…………………………………………………… 31
5.3.1問題描述………………………………………………….32
5.4 CMM夾具的模擬……………………………………………34
第六章 結果與展望…………………………………………………37
附圖、表 38
參考文獻………………………………………………………………..65
附錄A 67
圖、表目錄
表2-1 晶片和銀膠(2100A)雙材料界面的各項參數………………38
表4-1 材料性質表……………………………………………………39
表5-1 KI、KII及相角之對照表……………….……………………39
圖1.1 MCM BGA……………………………………………… .40
圖1.2 Stacked BGA……………………………………………..40
圖1.3 研究流程圖……………………………………………………41
圖 2-1 兩種破壞類型……………………………………………… 41
圖 2-2 尖端塑性降伏的大小在各區的分佈………………………. 42
圖 2-3 破壞力學三種模式………………………………………… 42
圖2.4 構裝雙材料交界面裂縫的示意圖……………………………43
圖 2-5 負載前後位移的變化…………………………………………43
圖 2-6 裂縫尖端的二次等參元素………………………………….44
圖2-7 奇異性元素……………………………………………………45
圖 2-8 J積分示意圖………………………………………………….46
圖3-1 CMM的尺寸(mm)…………………………………………… 46
圖3-2 CMM夾具設計圖…………………………………………… 47
圖3-3 CMM夾具……………………………………………………. 48
圖3-4 三明治試片………………………………………………… 49
圖3-5 三明治試片………………………………………………….49
圖3-6 製備盤…………………………………………………………50
圖3-7 中間盤………………………………………………………….50
圖3-8 中間試片……………………………………………………….51
圖3-9 INSTRON 8800微拉試驗…………………………………..50
圖3-10 1KN的力量感測器(load cell)………………………………52
圖4-1 試片一及試片二的破壞斷面…………………………………52
圖4-2 (a)上表面的斷面圖……………………………………………53
圖4-2 (b) 下表面的斷面圖………………………………………….53
圖4-3 (a) 上表面的斷面圖………………………………………….54
圖4-3 (b) 下表面的斷面圖………………………………………….54
圖4-4 兩種負載與位移的拉伸線……………………………………55
圖4-5 負載及位移……………………………………………………55
圖4-6 780N對應之斷裂圖…………………………………………..56
圖4-6 代表零度之負載及位移線……………………………………56
圖5-1 裂縫尖端能量釋放率對環形範圍內圈數變化圖……………..57
圖5-2 使用K指令所取的節點……………………………………….57
圖5-3 對稱及反對稱…………………………………………………58
圖5-4 不同的Mesh圈數……………………………………………58
圖5-5 範例一的圖形及邊界條件 ………………………………….59
圖5-6 範例一J積分與理論值的比較………………………………59
圖5-7 範例一J積分求得KI與理論KI值的比較…………………60
圖5-8 範例二的圖形及邊界條件……………………………………61
圖5-9 範例二之J積分與理論值的比較…………………………….61
圖5-10 範例三的圖形及邊界條件………………………………….. 61
圖5-11 範例三之J積分與理論值的比較…………………………….62
圖5-12 CMM有限元素網格…………………………………………62
圖5-13 界面有限元素網格…………………………………………..63
圖5-14 位移法及J積分所計算出的能量釋放率(G)……………… 63
圖5-15 加入LOCTITE324後的網格圖……………………………… 64
圖5-16 尖端打開的形狀…………………………………………… 64

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