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A Coupled Elastoplastic-transient Hydrogen Diffusion Analysis to Simulate the Onset of Necking in Tension by Using the Finite Element Method by R. Miresmaeili; M. Ogino; T. Nakagawa; H. Kanayama is a Engineering article available to read on EtoBox.

What is A Coupled Elastoplastic-transient Hydrogen Diffusion Analysis to Simulate the Onset of Necking in Tension by Using the Finite Element Method about?

Hydrogen-enhanced localized plasticity (HELP) is an acceptable mechanism for hydrogen embrittlement which is based on the experimental observations and the theoretical computations. The underlying principle in the HELP theory is that the presence of hydrogen causes the localization of the slip bands which results in the decrease of the fracture strength. In a sample under plane-strain tensile stress, plastic instability can lead to either the concentration of plastic flow in a narrow neck or bifurcation from homogeneous deformation into a mode of an exclusively localized narrow band of intense shear. Recently, it has been demonstrated that the presence of hydrogen can indeed induce shear banding bifurcation at macroscopic strains. By using a steady-state equilibrium equation for hydrogen diffusion analysis, the effect of hydrogen on the bifurcation of a homogeneous deformation in a plane-strain tension specimen into a necking or a shear localization mode of deformation has already been studied. In the present research, using a transient hydrogen diffusion analysis and introducing a new constitutive equation accompanied by considering the reduction in the local flow stress upon hydr

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Author

R. Miresmaeili; M. Ogino; T. Nakagawa; H. Kanayama

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0360-3199)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)