Effect of Residual Stresses on the Hardness of Ceramic/Cemented Carbide Compacts
残余应力对陶瓷/硬质合金复合片硬度的影响

The effect of residual sheax stress on the hardness of materials was considered and the relationship between the residual shear stress and the maximum shear strss induced by hardnesspressure head was also deduced. The analysis indicates that the residual shear stress reduces thehardness of materials whatever its direction which is different from the residual normal stress. Thedecease value of hardness by residual shear stress is larger than the increase value of hardness bycompressive stress near the interface of the ceramic/cemented carbide compact. According to this,it is considered that the hardness of the ceramic surface not only can't increase but also decrasedue to the effect of the residual shear stress, although larger residual compressive stress cajn beformed in the ceramic when the ceramic is too thin and its thermal expansion coefficient is smallerthan that of the cemented carbide.