Scratching Test of Hard-Brittle Materials Under High Hydrostatic Pressure

This paper proposes machining under high hydrostatic pressure as a new damage-free machining method for hard-brittle materials. Experiments for this study utilized a specially designed scratching test device, and the pin-on-disc scratching tests were conducted with three (3) hard-brittle materials (i.e., silicon, glass, and quartz) under pressure of 400 MPa and zero MPa. Traces of scratches on these specimens were examined with microscopes to evaluate the effects of hydrostatic pressure on machining defects. The results of the experiments show that hydrostatic pressure is efficient in minimizing machining defects and optimizing the productivity of the hard-brittle materials used in these experiments. Based on these findings, the paper concludes that the origin of a machining crack must exist in the subsurface of the workmaterial.

[1]  Nakasuji Tomoaki,et al.  Diamond Turning of Brittle Materials for Optical Components , 1990 .

[2]  B. Crossland,et al.  The Plastic Flow and Fracture of a ‘Brittle’ Material (Grey Cast Iron) with Particular Reference to the Effect of Fluid Pressure , 1958 .

[3]  D. Bhat.  Comment on “Elastic/Plastic Indentation Damage in Ceramics: The Median/Radial Crack System” , 1981 .

[4]  Ronald O. Scattergood,et al.  Ductile‐Regime Machining of Germanium and Silicon , 1990 .

[5]  Percy Williams Bridgman,et al.  The Effect of Hydrostatic Pressure on the Fracture of Brittle Substances , 1947 .

[6]  K. Kurihara,et al.  CROSS-SECTION TRANSMISSION ELECTRON MICROSCOPE OBSERVATIONS OF DIAMOND-TURNED SINGLE-CRYSTAL SI SURFACES , 1994 .

[7]  Kunio Hayashi,et al.  Fracture toughness of single crystal silicon. , 1991 .

[8]  Katsuhiro Maekawa,et al.  Plasma hot machining for new engineering materials , 1990 .

[9]  H. C. Heard,et al.  EFFECTS OF THE INTERMEDIATE PRINCIPAL STRESS ON THE FAILURE OF LIMESTONE, DOLOMITE, AND GLASS AT DIFFERENT TEMPERATURES AND STRAIN RATES , 1967 .

[10]  R. Scattergood,et al.  Ductile-Regime Grinding: A New Technology for Machining Brittle Materials , 1991 .

[11]  A. Franks,et al.  Single-point diamond machining of glasses , 1989, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[12]  Michael V. Swain,et al.  Microfracture about scratches in brittle solids , 1979, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[13]  Brittle-Ductile Behavior of Crystal Surface in Finishing , 1969 .

[14]  Kenji Inoue,et al.  Ultraprecision ductile cutting of glass by applying ultrasonic vibration , 1992 .