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Research on evaluation and examination for wear of ceramic coated materials

陶瓷涂层材料磨损评价与检测研究

基本信息

批准号：
02555020
负责人：
ISHIKAWA Hiromasa
金额：
$ 6.59万
依托单位：
Hokkaido University (Faculty of Engineering)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

(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.

(1)磨损机理的数值模拟在分析滚动-滑动接触过程中材料的变形时，必须考虑循环塑性变形引起的棘轮效应。因此，本文建议采用作者提出的循环塑性本构方程。因此，塑性剪切应变通过棘轮效应在接触表面或表面下累积。然后，可以预期的是，微裂纹，开始磨损将产生在最大塑性剪切应变的深度。此外，材料的接触性能和摩擦系数的差异也会影响变形和应力应变的分布。(2)陶瓷涂层材料的变形为了研究陶瓷涂层的效果，使用有限元方法分析了陶瓷涂层材料的变形。结果表明，随着陶瓷厚度的增加，触头材料的变形减小，但陶瓷厚度过大会在涂层与基体材料的界面处产生应力集中，因此有必要考虑最合适的陶瓷厚度。(3)磨损试验与评价方法为了评价磨损量，对激光散斑技术进行了试验，结果表明，各种激光散斑参数与材料的磨损量有关。该方法可用于陶瓷涂层材料的磨损评价。