Hydrogen Transport in a Coupled Elastoplastic-Diffusion Analysis near a Blunting Crack Tip

Journal of Computational Science and Technology

Takuya NAKAGAWA¹  Masao OGINO²  Takahiro TODA³  Hiroshi KANAYAMA²  Reza MIRESMAEILI¹ 

[1] Department of Intelligent Machinery and Systems, Graduate School of Engineering, Kyushu University;Department of Mechanical Engineering, Faculty of Engineering, Kyushu University and AIST;Department of Intelligent Machinery and Systems, School of Engineering, Kyushu University

关键词: Crack Tip Plasticity;    Hydrogen-Induced Cracking;    Hydrogen Embrittlement;    Small Scale Yielding Conditions;    Local Flow Stress;    Coupled Analysis;    Finite Element;   

DOI  :  10.1299/jcst.2.499

学科分类：地球科学(综合)

来源: Japan Academy

【 摘 要 】

References(27)Cited-By(6)The role of hydrogen in hydrogen embrittlement, stress corrosion cracking and hydrogen induced cracking has been largely determined. The hydrogen cracking problem in metallurgical fields has been studied for many years. In spite of that, it is still not possible to explain exactly how the presence of hydrogen within the metal structure leads to hydrogen embrittlement and crack formation. Hydrogen-enhanced localized plasticity (HELP) is an acceptable mechanism of hydrogen embrittlement and hydrogen-induced cracking in materials. In the present work, a finite element analysis is implemented to estimate the large deformation elasto-plastic behavior of the material in conjunction with the hydrogen diffusion analysis results. Hydrogen is highly mobile and can diffuse through the crystal lattice dissolving into its interstitial sites. It is necessary to assume the model which can describe the hydrogen diffusivity near the blunting crack tip as well as the large deformation phenomena. Finite element analysis is here employed to solve the coupled boundary-value problem of large strain elasto-plasticity and equilibrium hydrogen distributions ahead of a blunting crack tip by taking into consideration the effect of hydrogen on local flow stress.

【 授权许可】

Unknown