本研究係利用穿透式光彈法及取代式疊加法探討含一近表面裂縫之半無窮平板，在其表面上受到集中載荷時於裂縫尖端附近之應力狀態。由於近表面裂縫的存在，接近接觸點區域之應力分佈情形已並非如Hertz所提出之原始接觸應力理論，而裂縫尖端附近之應力分佈情形亦不同於存在於無窮大區域內裂縫的理論解。本研究藉由改良取代式疊加法的應用，能夠有效的分析近表面裂縫附近的應力分佈情形，並探討改變集中載荷的大小、施載點位置與裂縫傾角，以瞭解裂縫尖端應力強度因子之變化。

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