Combined macroscopic and microscopic approach to the fracture of metals. Annual progress report, 1981-1982
The final results of the recently completed theoretical study of the stress and deformation fields near a growing crack are presented. The shear-lag model has been successfully used to estimate stress in the hard martensite constituent of dual-phase steels under load. The stress values were correlated with the measured strain. In related work, the effect of the size and distribution of hard carbide particles on fracture initiation and fracture toughness was studied in high strength steels, 4140 and 4340, with particular attention to the mode of crack tip advance. The continuing study of the hydrogen assisted fracture of carbon steels was extended to a high carbon steel, i.e., 1095 spheroidized. This steel shows a transition of fracture mode from ductile to cleavage as a function of charging current density. In the area of elevated temperature rupture, a micromechanical model is proposed for creep crack growth by the mechanism of grain boundary void nucleation, growth, and coalescence with the macro-crack.
- Research Organization:
- Brown Univ., Providence, RI (USA). Div. of Engineering
- DOE Contract Number:
- AC02-80ER10556
- OSTI ID:
- 5106792
- Report Number(s):
- DOE/ER/10556-91; COO-3084-91; ON: DE82019950
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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