Indentation and erosion of brittle materials

Technical Report · Mon Jun 01 04:00:00 EDT 1981

OSTI ID:6067485

Khatibloo, M A

This work deals with the indentation and erosion of brittle materials. After a review of the extensive literature on both static indentation and low velocity impacts with round particles, no completely satisfactory explantation was found for the apparent increase in the strength of brittle materials as the indenter radius is decreased. As a starting point, the mechanical behavior of brittle materials was studied and their various responses to loading were classified. The response can be elastic, elastic-plastic or completely plastic depending on the structure and bonding type of the material as well as the shape and size of the indenter. Plasticity occurs whenever sharp or very small indenters are used. In this case, it was found that the idealization of plastic deformation by an expanding cavity concept is a satisfactory one. A model using this approach showed that cracks refered to as median vent, radial and multiple cone cracks initiate and propagate along paths close to the principal stress trajectories in the uncracked solid. On the other hand, this model can give only the initiation locations of lateral cracks. A prediction of the crack trajectories in this case appears to require additional analysis. 84 references.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6067485
• Report Number(s): LBL-11883; ON: DE81030351
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BRITTLENESS
CHALCOGENIDES
CRACK PROPAGATION
CRACKS
DEFORMATION
DOCUMENT TYPES
DUCTILITY
EROSION
FAILURES
FRACTURE PROPERTIES
FRACTURES
GLASS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
REVIEWS
ROUGHNESS
SURFACE PROPERTIES
TENSILE PROPERTIES