期刊
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
卷 41, 期 8, 页码 1649-1661出版社
WILEY
DOI: 10.1111/ffe.12803
关键词
edge tracing method; fracture locus; low temperature; notched tensile specimen; stress triaxiality
资金
- Chinese Scholarship Council
- Research Council of Norway [228513/E30]
Quasi-static tensile tests with smooth round bar and axisymmetric notched tensile specimens have been performed to study the low-temperature effect on the fracture locus of a 420-MPa structural steel. Combined with a digital high-speed camera and a 2-plane mirror system, specimen deformation was recorded in 2 orthogonal planes. Pictures taken were then analysed with the edge tracing method to calculate the minimum cross-section diameter reduction of the necked/notched specimen. Obvious temperature effect was observed on the load-strain curves for smooth and notched specimens. Both the strength and strain hardening characterized by the strain at maximum load increase with temperature decrease down to -60 degrees C. Somewhat unexpected, the fracture strains (ductility) of both smooth and notched specimens at temperatures down to -60 degrees C do not deteriorate, compared with those at room temperature. Combined with numerical analyses, it shows that the effect of low temperatures (down to -60 degrees C) on fracture locus is insignificant. These findings shed new light on material selection for Arctic operation.
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