分野別セミナー

Hydrogen-enhanced localized plastiticity (HELP) is recognized
as a viable mechanism of hydrogen embrittlement. A possible
way by which the HELP mechanism can bring about macroscopic
material failure is through hydrogen-induced cracking. In this
work, according to the HELP theory, a constitutive formulation
for elastoplasticity model in the presence of hydrogen is
presented. To model the local phenomena associated with
hydrogen, the local flow stress is considered decreasing with
the increasing of hydrogen concentration. Following the
previous work, a new module in the open source code
ADVENTURE-Solid has been developed by the authors through
considering the effect of hydrogen on material softening in
microscale, which equips the open source code ADVENTURE-Solid
software for studying hydrogen-plasticity interactions. We
then combine the ADVENTURE-Solid with an in-house advection
diffusion finite element program, to analyze a transient
hydrogen diffusion-elastoplastic coupling problem ahead of a
crack tip. To validate the new module in the ADVENTURE-Solid,
a set of numerical test cases is presented and
discussed. Results obtained show good agreement with previous
results.