The Shearing Contribution in Transformation Toughening of Brittle Materials,
Abstract
A simple constitutive law is proposed for the description of a ceramic composite which undergoes stress induced martensitic transformation. This law is used in finite element calculations to investigate the shear effect on the transformation zone near a crack tip. A formula describing the stress intensity factor change due to the shear contribution of the transformation is given. Significant loss of toughness is observed in the case of a stationary crack and is attributed entirely to the shear component of the transformation is given. Significant loss of toughness is observed in the case of a stationary crack and is attributed entirely to the shear component of the transformation. As the crack grows, the wake of the transformed material left behind the crack constitutes a source of toughening. This toughening is due to both dilatancy and shear in the phase change and rises to a maximum level just after a propagation comparable with the zone height. Finally, it is shown that the shear component can be important when prediction of the fracture toughness of the transformation toughened ceramics are made.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA154656
Entities
People
- P. Sofronis
- R. M. Mcmeeking
Organizations
- University of Illinois Urbana–Champaign