Mechanics of deformation and ductile tearing in cracked round bar specimens

This paper presents observations and analyses of the deformation and early stage of ductile tearing in cracked round bar (CRB) fracture specimens. Fracture surface topography analysis (FRASTA), stability analysis and simple kinematic analysis are applied to CRB specimens of HY-130 steel and pressure...

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Bibliographic Details
Published in:Engineering fracture mechanics 1998, Vol.59 (2), p.117-136
Main Authors: Giovanola, Jacques H., Kobayashi, Takao
Format: Article
Language:English
Subjects:
cracked-round-bars, ductile tearing, initiation toughness, crack instability, fracture surface topography analysis, crack opening displacement
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Summary:This paper presents observations and analyses of the deformation and early stage of ductile tearing in cracked round bar (CRB) fracture specimens. Fracture surface topography analysis (FRASTA), stability analysis and simple kinematic analysis are applied to CRB specimens of HY-130 steel and pressure vessel steel welds. The J–resistance curve for HY-130 steel is constructed over the first 250 μm or so of crack extension and bounds on the amount of crack extension preceding the point of maximum load are established. Further, the influence of crack growth on J Ic defined at maximum load is assessed and it is argued that, for small CRB specimens, this definition is consistent with that of standard testing methods. It is shown that crack mouth and crack tip opening displacement values can be readily estimated from global displacement measurements with extensometers. It is also shown that bending of the CRB specimen due to an eccentric ligament has a relatively small effect (
ISSN:0013-7944
1873-7315
DOI:10.1016/S0013-7944(97)00128-8