In this condition, both the linear-elastic and the EPFM are unable to characterize the crack-tip condition due to the significant creep strain.
In this article, the short-term fracture toughness parameter [J.sub.c] is experimentally correlated with the long-term SCG behavior based on the conventional EPFM. A similar approach which correlated [J.sub.c] with the SCG data was reported by Zhou et al.
The early two phases of the crack follow the elastoplastic fracture mechanics (EPFM
) and were renamed as (i) microstructurally short crack (MSC) growth and (ii) physically small crack (PSC) growth.
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In this article, both LEFM and EPFM
methodologies are used to characterize nylon-based materials under consideration for an industrial caster application.
The EMC Documentum EPFM
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approach through the J-integral methodologies is to be used to achieve the fracture toughness at crack initiation, [J.sub.IC], which is measured from the determination of the crack resistance curve, J-R curve, where J is plotted versus the crack extension, [DELTA][alpha].
The evaluation of the energy requirements for crack propagation in ductile processes ([J.sub.q]) is usually described by nonlinear elastic fracture mechanics, commonly referred to as elastic-plastic fracture mechanics (EPFM
Therefore, to assess the toughness one needs to employ either elastic-plastic (EPFM
) or post-yield fracture mechanics (PYFM) approaches.