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个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 国际磨粒技术学会（International Committee of Abrasive Technology, ICAT）委员，中国机械工程学会极端制造分会副主任、生产工程分会常务委员、微纳米制造技术分会常务委员，中国机械工程学会生产工程分会磨粒加工技术专业委员会副主任、切削加工专业委员会常委委员、精密工程与微纳技术专业委员会常委委员，中国机械工程学会特种加工分会超声加工技术委员会副主任，中国机械工程学会摩擦学分会微纳制造摩擦学专业委员会常务委员，中国机械工业金属切削刀具协会切削先进制造技术研究会常务理事、对外学术交流工作委员会副主任、切削先进制造技术研究会自动化加工技术与系统委员会副主任。
性别：男
毕业院校：西北工业大学
学位：博士
所在单位：机械工程学院
学科：机械制造及其自动化. 机械电子工程. 航空宇航制造工程
办公地点：机械工程学院7191
电子邮箱：kangrk@dlut.edu.cn
Material removal mechanism and deformation characteristics of AIN ceramics under nanoscratching
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论文类型：期刊论文
发表时间：2019-11-01
发表刊物：CERAMICS INTERNATIONAL
收录刊物：SCIE、EI
卷号：45
期号：16
页面范围：20545-20554
ISSN号：0272-8842
关键字：AlN ceramics; Scratching; Stress; Material removal mechanism
摘要：To investigate the fundamental mechanism of the deformation and fracture behavior of aluminum nitride (AlN) eramics in ultra-precision grinding, single and double scratches of AlN ceramics were carried out using a Berkovich indenter. Depth-displacement curve and surface morphology of the single varied force scratch revealed that the brittle-ductile transition occurs during scratching. In the brittle deformation stage, the stress below workpiece surface plays an key role in the change of scratch direction, and grains spall due to crack propagation. Depth-displacement curves and surface morphology of the double scratches revealed that the second and first scratches merge into one scratch in the case of the double scratches with distance of 0.5 mu m and 1 mu m, leading to the increase in the second scratch depth. A double-scratching-induced stress field model under constant force was established using the Boussinesq field, the Cerruti field, and the sliding bubble field to investigate interaction principle of double scratches and the material removal mechanism of AlN ceramics. Results indicated that the interaction of double scratches leads to the increase in the maximum principal stress of lateral cracks; the maximum principal stress reaches the extreme value after the indenter is unloaded; and the interaction of lateral cracks between double scratches leads to in overall removal of workpiece material and the slip of the second scratch.