The stress distribution of notched specimen of brittle material under a plane pressure was studied using a photoelastic meth-od,When elastic deformation appeared inside the specimen,the force transferred by dowel part was triangular transverse forceand frictional force on the upper surface of the sample.The quantity of the frictional force was about 31 percent of transverseforce.The stress inside the sample was linear along the central cross section of the sample and there was maximum tensile stressσy at the tip of the notch.Basing on shearing stress deviation method,the tensile stress σy,σx and shearing stress τxy at the cen-tral sections and four adjacent cross sections were calculated.The result pointed out that σx and τxy were smaller than σy.There-fore,σy was the main factor for crack formation and propagation.
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