Effect of Specimen Geometry on Bending and Tensile Strength of Material Used in Dissimilar Joints

세라믹 이종접합 시험편형상 Ceramic( ), Dissimilar Joint( ), Specimen Geometry( ), Residual Abstract: The effect of specimen geometry on the bending and tensile strengths of dissimilar joints ( -Si β 3N4/S45C) with copper interlayers was evaluated. The average bending strength of specimens with circular cross sections was higher than that of specimens with rectangular cross sections. The crack initiation stress (σi) was successfully determined by the acoustic emission (AE) method and was approximately 60~80% of the bending strength. The residual stresses near the interfaces on the ceramic side were measured by X-ray diffraction before conducting the bending test. The bending strength and the crack initiation stress decreased with an increase in the residual stresses. The effect of the bending strain component was evaluated by the tensile testing; the tensile strength decreased with an increase in the bending strain component and was approximately 80% of the bending strength.