Fundamentals of fracture and fatigue: a basis for alloy design
Micro-mechanics and mechanisms describing fundamental aspects of failure by fatigue and fracture are examined from the perspective of alloy design of superior engineering metals and alloys. First, the physical basis for intrinsic fracture toughness in materials is derived through several micro-mechanical models for both brittle and ductile fracture, specifically for cleavage, microvoid coalescence and transitional fracture modes. Second, factors governing the rate of growth of fatigue cracks are described, with emphasis on the role of crack tip shielding mechanisms such as crack closure. Examples of the design of microstructures giving optimum resistance to fatigue crack propagation are presented, with emphasis on high temperature behavior. 113 refs., 32 figs.
- Research Organization:
- California Univ., Berkeley (USA). Dept. of Materials Science and Mineral Engineering; Minnesota Univ., Minneapolis (USA). Dept. of Chemical Engineering and Materials Science; Georgia Inst. of Tech., Atlanta (USA). Fracture and Fatigue Research Lab.
- DOE Contract Number:
- FG02-84ER45141; AC03-76SF00098
- OSTI ID:
- 6955458
- Report Number(s):
- CONF-860340-11; ON: DE87002075
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CLEAVAGE
CRACK PROPAGATION
CRYSTAL STRUCTURE
DESIGN
FAILURES
FATIGUE
FRACTURE PROPERTIES
FRACTURES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
OPTIMIZATION