Research on evaluation and examination for wear of ceramic coated materials

点击翻译按钮获取中文摘要

(1) Numerical simulation of wear mechanismTo analyze the deformation of material during rolling-sliding contact, it is neccessary to consider a ratchetting effect caused by cyclic plastic deformation. Therefore, the constitutive equation for cyclic plasticity proposed by one of the researchers if used. As a result, the plastic shear strain is accumulated by ratchetting at the contact surface or subsurface. Then, it is expected that the micro cracks that initiate wear will be generated at the depth of the maximum plastic shear strain. In addition, the difference of the material properties in contact and friction coefficient affect the deformation and the distribution of stress and strain.(2) Deformation of ceramic coated material To investigate the effect of ceramic coating, the deformation of material coated by ceramics is analyzed using a finite element method. As a result, it is clear that with increase of the thickness of ceramics deformation of the contact material decreases, but the excess of thickness of ceramics produces the stress concentration at the interface of the coating layer and base material so it is necessary to consider the most appropriate thickness of ceramics.(3) Wear test and evaluation method To evaluate the amount of wear, laser speckle technique is tested and it is shown that various laser speckle parameters are related to the amount of wear of material. So it is expected that this method is applicable to evaluate the wear of ceramic coated material.