Mechanics Model for Ceramic Materials Machining under Compressive Pre-stress
Abstract:Based on the elastic mechanics and indentation fracture mechanics, a processing mechanics model of ceramic materials was proposed. The effects of pre-stress and load ratio on the first principal stress and maximum shear stress of the material were analyzed. As the compressive pre-stress increases, the first principal stress will transform gradually from tensile stress state to compressive stress state, the maximum shear stress first decreases and then increases. If an appropriate compressiive pre-stress is applied, the maximum shear stress within the material is reduced, and the crack propagation direction within materials is changed, leading to the effective reduction of the material damages during processing. The first principal stress behind the indenter changes into a tensile stress, the maximum shear stress increases, but the load ratio does not affect the stress field below the indenter with increasing the load ratio. In addition, the theoretical results by modeling were confirmed by the experimental data of the pre-stress scratching tests on SiC ceramic, indicating that the pre-stress machining of ceramic materials could be feasible.
Document Type: Research Article
Affiliations: School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
Publication date: 2013-06-01
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- Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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