Failure analysis of exit edges in ceramic machining using finite element analysis

✍ Scribed by Yuqing Cao

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 986 KB
• Volume: 8
• Category: Article
• ISSN: 1350-6307
• DOI: 10.1016/s1350-6307(00)00024-8

✦ Synopsis

Edge chipping is a mode of surface damage in ceramic machining. Its presence not only compromises dimensional and geometric accuracy, but also causes possible failure of the ceramic components during service. In this paper, a ®nite element analysis is used to investigate the size of exit edge chipping as related to the loading conditions and intrinsic ¯aws of materials. A local remeshing algorithm was implemented to accommodate the curved crack trajectory in forming an exit edge chip based on the theory of fracture mechanics. Stress intensity factors at the crack tips were calculated for a variety of loading conditions and cracks presented at the critical locations. Machining experiments were performed on glass-ceramics to validate the FEA results. A close correspondence between the predicted and measured width of exit edge chipping gives the con®dence of using this proposed ®nite element method in selecting machining conditions and material properties to minimizing machining damage.