Material properties and fracture mechanics in relation to ceramic machining

Technical Report · Thu Dec 02 04:00:00 EST 1993

DOI:https://doi.org/10.2172/10122649· OSTI ID:10122649

Griffith, L V

Material removal rate, surface finish, and subsurface damage are largely governed by fracture mechanics and plastic deformation, when ceramics are machined using abrasive methods. A great deal of work was published on the fracture mechanics of ceramics in the late 1970s and early 1980s, although this work has never resulted in a comprehensive model of the fixed abrasive grinding process. However, a recently published model describes many of the most important features of the loose abrasive machining process, for example depth of damage, surface roughness, and material removal rate. Many of the relations in the loose abrasive machining model can be readily discerned from fracture mechanics models, in terms of material properties. By understanding the mechanisms of material removal, from a material properties perspective, we can better estimate how one material will machine in relation to another. Although the fracture mechanics models may have been developed for loose abrasive machining, the principles of crack initiation and propagation are equally valuable for fixed abrasive machining. This report provides a brief review of fracture in brittle materials, the stress distribution induced by abrasives, critical indenter loads, the extension of cracks, and the relation of the fracture process to material removal.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10122649
• Report Number(s): UCRL-ID--115689; ON: DE94006623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201
360203
ABRASIVES
CERAMICS
CRACK PROPAGATION
CRACKS
EQUATIONS
FRACTURE MECHANICS
MACHINING
MECHANICAL PROPERTIES
PREPARATION AND FABRICATION
REVIEWS
WEAR