文章基本信息

标题：Finite Element Implementation of an Elastoplastic Constitutive Equation in the Presence of Hydrogen
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作者：Lijun LIU ; Reza MIRESMAEILI ; Masao OGINO 等
期刊名称：Journal of Computational Science and Technology
电子版ISSN：1881-6894
出版年度：2011
卷号：5
期号：1
页码：62-76
DOI：10.1299/jcst.5.62
出版社：The Japan Society of Mechanical Engineers
摘要：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 hydrogeninduced 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 ADVENTURESolid, a set of numerical test cases are presented and discussed. Obtained results show good agreement with previous results.
关键词：Hydrogen Embrittlement;Crack Tip Plasticity;HELP Theory;Hydrogen-Induced Cracking;Small Scale Yielding Conditions;Local Flow Stress;ADVENTURE_Solid;Coupled Analysis