Surface integrity of creep feed ground structural ceramics

Thesis/Dissertation · Mon Dec 31 23:00:00 EST 1990

OSTI ID:7266776

Buehler, W L

This study investigates the mechanics of creep feed grinding of structural ceramics with particular emphasis on the integrity of the finished surface. A fractional factorial experiment of 2{sup 5} conditions was used to determine the effects of grinding wheel bond (resinoid and vitreous), grit size (80 and 180), grit concentration (50 and 100) and work speed on Al{sub 2}O{sub 3} and ZrO{sub 2} specimens. Two depths of cut were interspersed with the varied grinding conditions. Normal and tangential grinding wheel stresses were calculated from wheel entry and exit incremental, measured vertical and horizontal force data. Average normal and tangential stresses were found to be nearly constant below a local material removal rate of about 4 mm{sup 2}/sec{sup 2} (time rate of change of volumetric removal rate per unit wheel width). This implies that rubbing or plowing predominates in the low material removal rate region of the finished surface. In the higher material removal rate regions, large grinding wheel stresses imply greater abrasive grit penetration into the workpiece and a predominance of lateral fracture as a removal mechanism. An additional result of the stress determination is that exit conditions are different from entry conditions and thus highlight the effect of median fracture as a result of workpiece geometry.

• Research Organization: Lehigh Univ., Bethlehem, PA (United States)
• OSTI ID: 7266776
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COMMINUTION
EVALUATION
GRINDING
MACHINING
OXIDES
OXYGEN COMPOUNDS
STRESS ANALYSIS
SURFACES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES