本文主要在探討以沖孔類型的加工方式，對鋁合金薄板中央加工
出一圓孔，考慮在線彈性範圍內，平板兩側承受單軸向拉應力，圓孔
在沖孔類型的加工下造成表面粗糙，視為多個微缺口，首先考慮單一
缺口與圓孔相差的比例幾倍時，能視為複合應力集中。在確定本研究
符合複合應力集中現象後，考慮不同表面粗糙尺寸下應力集中的情
況，以及對鋁合金6061-T6薄板的壽命的影響，並以有限單元分析軟
體 ANSYS 進行本研究的模擬及分析。
由結果顯示，當單一缺口與圓孔比例超過 50 倍時，可視為複合
應力集中。圓孔上含表面粗糙時，會依據表面粗糙放大使得應力集中
現象加成的上升，疲勞壽命大幅降低，故未來在以沖孔加工時須特別
注意表面粗糙對疲勞壽命的影響。

This thesis is discussing the processing method of punching type, and a hole is machined in the center of aluminum alloy thin plate. Considering within the linear elastic range, the plate is subjected to uniaxial tensile stress. The type of processing causes the surface of the hole to be rough, which is regarded as a multiples of micro-notches. While regarding the ratio of the dimensions of the single notch and the circular hole several times, it can be regarded as compound stress concentration phenomenon. After confirming that the present case meets the compound stress concentration phenomenon, the stress concentration under different surface roughness dimensions and the influence on the fatigue life of aluminum alloy 6061-T6 thin plate are considered, the simulation and analysis of this study are carried out by the finite element analysis software ANSYS.
The results show that when the size ratio of circle hole to single notch exceeds 1/50, it can be regarded as compound stress concentration. When the surface of the round hole is rough, the stress concentration will be increased, and the fatigue life is greatly reduced. Therefore, in designs, special attention should be paid to the influence of surface roughness on the fatigue life.

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