ISSN:
1573-2673
Keywords:
Fracture
;
steel
;
weld metal
;
stress
;
strain
;
toughness
;
notched specimen.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The cleavage fracture criterion of low alloy steel and weld metal in notched specimens is investigated in detail based on a great number of experimental data. It has been found that the most cleavage fractures initiate at a distance shorter (left side) than that of the peak stress location below a notch root, and the cleavage fracture in notched specimens must satisfy a dual criterion, i.e., a critical plastic strain (εp ≥ εpc) for initiating a crack nucleus, and a critical tensile stress (σyy ≥ σf) for its propagation. According to the dual criterion model, the great number of experimental data of 4PB (four-point bending) tests for the low alloy steel and weld metal and their statistical distribution are explained. The effects of temperature , the local fracture stress σf and the critical plastic strain εpc on the locations of cleavage initiation sites and the controlling steps of cleavage fracture process are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007464126165
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