本研究將依據Chen(2009)所推導之理論公式設計一套Ⅲ型斷裂韌度試驗，針對單一及複合含邊緣裂縫石膏試體受反平面剪力情形進行研究。本研究之實驗條件為無圍壓及簡單化荷重加載下進行Ⅲ型斷裂試驗，且針對試體厚度、反平面剪力加載範圍與作用位置為變數條件下，本研究完成一套室內實驗程序，並以Chen(2009)之公式來計算Ⅲ型斷裂韌度。
本研究發現，在10mm厚度之試體與70°弧度受力範圍，並接近裂縫端之試驗，可測得較為穩定保守之Ⅲ型斷裂韌度值。試驗結果顯示兩相異石膏複合型態試體之Ⅲ型斷裂韌度值介於兩不同均質石膏Ⅲ型斷裂韌度值之間。然而使用剪力模數大於基底石膏材料複合時，Ⅲ型斷裂韌度值會隨剪力模數比變大而增大。使用剪力模數較小之材料複合，則會有相反的情況。

This study proposes to design a set of mode Ⅲ fracture toughness test based on Chen’s (2009) theoretical formula. The test samples were made by homogeneous and composite gypsum specimens. The circular disks with edge crack were prepared to be under an anti-plane shear loading condition. No confining pressure was applied in the test and a simplistic mode Ⅲ fracture toughness test was carried out. The effects of different thicknesses of the specimens with different anti-plane shear arc loading conditions were investigated. In this study, Chen’s formula was used to evaluate the mode Ⅲ fracture toughness.
This study finds that the specimen of 10 mm thickness with 70° arc loading condition can achieve the most conservative values of mode Ⅲ fracture toughness. The experimental results show that the mode Ⅲ fracture toughness of different gypsum composite specimen can be a function of shear modulus ratio.

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