Mechanics of Interface Cracks
Abstract
Fracture of advanced materials, such as intermetallic alloys, ceramics, and composite materials nearly always begins at interfaces of one sort or another. FIbrous fractures, for example, initiate at the interfaces between second phase particles (or reinforcement fibers, whiskers, etc) and the ductile matrix; the conditions for this to occur are sensitive to both matrix constitutive properties as well as to the chemistry and structure of the interfaces between the two phases. Interfacial cleavage involves the initiation of micrto-cracks and their propagation along interfaces and transgranular cleavage often initiates at interfacial sites, e.g. twin boundaries in intermetallic compounds, especially those with non-cubic crystal structures. Here again, the conditions required for this to occur are sensitive to the constitutive properties of the matrix materials as well as to the interfacial properties themselves. Intermetallic alloys, in particular, are known to possess complicated thermal and strain rate dependencies that can lead to either brittle or ductile behavior which in any event are very much dependent upon the loading conditions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 27, 1990
- Accession Number
- ADA227579
Entities
Organizations
- University of California, San Diego