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首页> 外文期刊>Journal of Computational Science and Technology >Finite Element Implementation of an Elastoplastic Constitutive Equation in the Presence of Hydrogen
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Finite Element Implementation of an Elastoplastic Constitutive Equation in the Presence of Hydrogen

机译：氢存在下弹塑性本构方程的有限元实现

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References(17) Cited-By(2) 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.
机译：参考文献（17）被引用的（2）增强氢的局部可塑性（HELP）被认为是氢脆的可行机制。 HELP机理可能导致宏观材料失效的一种可能方式是通过氢致裂纹。在这项工作中，根据HELP理论，提出了在氢存在下弹塑性模型的本构公式。为了模拟与氢有关的局部现象，认为局部流动应力随着氢浓度的增加而减小。在先前的工作之后，作者通过考虑氢气对微观尺度上材料软化的影响，在开源代码ADVENTURE-Solid中开发了一个新模块，该模块配备了用于研究氢气-塑性相互作用的开源代码ADVENTURE-Solid软件。 。然后，我们将ADVENTURE-Solid与内部对流扩散有限元程序结合起来，以分析裂纹尖端之前的瞬态氢扩散-弹塑性耦合问题。为了验证ADVENTURESolid中的新模块，提出并讨论了一组数值测试用例。所得结果与以前的结果吻合良好。

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