Preliminary communication
Dynamic Fracture Mechanics Assessments by Simultaneous Magnetic Emission and Potential Drop Techniques
Zoran RADAKOVIĆ
orcid.org/0000-0001-8054-470X
; Faculty of Mechanical Engineering, Belgrade University, Belgrade, Serbia
Abstract
Modern structural integrity assessment procedures incorporate fracture mechanical concepts most of which rely on dynamic fracture mechanics parameter determination from experiments. In the case of dynamic loading conditions, various experimental methods have evolved for determining the loading parameters and load-displacement behaviour. Ductile structural steel has many applications and its properties are interesting for designing experiments that simulate ductile, brittle and mixed fracture behaviour. In this study are presented the results of fracture mechanics investigations of a ductile ferromagnetic low-alloy high strength steel, performed under dynamic loading conditions. Standard Charpy specimens are tested by simultaneous coupled magnetic emission (ME) and potential drop (PD) techniques for determining critical crack initiation properties and resistance curve determination of a ductile steel behaviour. Equivalent brittle, ductile, and mixed mode fracture behaviour may be simulated by choice of test temperature and impact velocity. Analysis of integrated ME and PD signal data, employed in deriving critical J integral, has been successful in interpreting unstable or stable crack initiation and propagation. Experimental results are discussed with respect to the characteristics and the physical interpretations of both of the independent experimental techniques. Some specific experimental difficulties in the reliable assessment of dynamic crack initiation parameters are outlined.
Keywords
Crack initiation; Ductility; Dynamic fracture mechanics; Impact testing; Magnetic emission; Potential drop
Hrčak ID:
78444
URI
Publication date:
30.6.2011.
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