Shear-induced cleavage fracture
- Southwest Research Inst., San Antonio, TX (United States)
Experimental evidence shows that shear-induced cleavage fracture is prominent in many intermetallic alloys and in-situ composites, as well as in other brittle materials. In materials with a plastically deformable matrix, the characteristics of shear-induced cleavage fracture generally include planar slip, slipband decohesion, and cleavage crack formation. In contrast, shear cracks with wing-tip cleavage cracks dominate in plastically nondeformable materials subjected to compressive loads. In this article, the phenomenon of shear-induced cleavage fracture is revisited. Theoretical analyses of the driving force for the fracture process are summarized to illustrate the salient features of shear-induced cleavage fracture and to derive the critical condition for crack instability. Applications of the brittle fracture theory to treating shear-induced cleavage in TiAl alloys, Nb-Cr-Ti alloys, rock salt, and alumina scales on overlay coatings are presented with experimental verifications.
- OSTI ID:
- 293127
- Report Number(s):
- CONF-970980--; ISBN 0-87339-381-3
- Country of Publication:
- United States
- Language:
- English
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