本文使用不同尺寸的應變規（Strain Gage Grid Length：10mm、1mm、0.2mm），測量金屬材料（Al 6061-T6）及複合材料（使用〔0/+45/90/-45〕2S、〔0/90〕4S 不同疊層）的中央鑽孔和裂縫尖端的應力集中情形：應力集中係數SCF（Stress Concentration Factor）、應力強度因子SIF（Stress Intensity Factor）；藉以瞭解被測物件的顯微受力分佈情形，並探討物件使用應變規量測所產生的尺寸效應（Size Effect）。
應變規尺寸的影響，在應力發生變化的量測位置上非常容易表現出來，可發現當尺寸愈大時，其量測的精密度會愈降低。在中央圓孔周圍之應力，由應力分佈示意圖，應力值具有由圓孔的邊緣以函數形式向外遞減的一致性。而雙邊穿透式裂縫之應力，由均為在裂縫上緣所量測之應力值分佈示意圖，皆從試片外側的零值急速上升至裂縫尖端上方的極大值，再下降至裂縫截面的公稱應力值。在量測SCF、SIF方面，除了0.2mm應變規之數據較接近理論值外，其他如1mm、10mm應變規的量測均有一定的偏差值。

This work uses different size of strain gages (Gage Grid Length: 10mm, 1mm, 0.2mm) to measure the stress distributions of metal (Al 6061-T6) and composite (laminates of [0/+45/90/-45]2S and [0/90]4S layers ) with a central circular hole and a crack. Both the SCF (Stress Concentration Factor) and SIF (Stress Intensity Factor) are found to consider the stress scatteredness of experimental data in contrast to micro- mechanics. To understand the strain gage size effect is our main purpose in measuring both types of materials.
The size effect of strain gage we find appears obviously in the measuring position with stress changing significantly. We find that the size of strain gage is bigger; the error of stress is higher. Analyzing the stress scattering around a central circular hole, we obtain the experimental result that the stress will first reduce drastically from central circular hole edge and then keep uniform. In analysis of the stress scattering around the crack tip, we observe that first stress rises quickly from the specimen’s free edge to the top of crack tip with a maximum value, and the stress keeps a nominal value in the specimen central part. Comparing the empirical result of SCF and SIF, we find that the data of 0.2mm of strain gage close to the theoretical solution, while those of 1mm and 10mm strain gages appear inexact in measuring and calculating SCF and SIF.

目錄 I
表目錄 II
圖目錄 V
摘要 VIII
ABSTRACT IX
第一章 緒論
1-1 前言 1
1-2 實驗材料簡介 1
1-2-1 金屬材料
1-2-2 複合材料
1-3 研究方向 3
1-4 文獻回顧 4
1-5 組織與章節 4
第二章 實驗部分
2-1 實驗材料概述 5
2-1-1 金屬材料
2-1-2 複合材料
2-2 試片編號 7
2-3實驗設備 8
2-4實驗過程 8
第三章 實驗結果
3-1中央圓孔應力實驗結果 19
3-2兩側對稱穿透式裂縫實驗結果 20
第四章 分析與討論
4-1 理論基礎 89
4-1-1 中央圓孔應力集中
4-1-2 裂縫尖端之應力強度因子
4-2 實驗結果分析 90
4-2-1中央圓孔應力集中係數
4-2-2 裂縫之應力強度因子
4-3 實驗結果討論 91
4-3-1 中央圓孔應力實驗
4-3-2雙邊穿透式裂縫應力實驗
4-4 結論 93
第五章 建議與未來展望
5-1 建議 99
5-2 未來發展 100
參考文獻 101

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