期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 68, 期 -, 页码 56-66出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2014.06.007
关键词
Cohesive zone; Hydrogen embrittlement; Finite element analysis; Constitutive law
资金
- Region Poitou-Charentes (Clara Moriconi PhD grant)
- French Government [ANR-11-LABX-0017-01]
Experimental studies in a hydrogenous environment indicate that hydrogen leads to a modification of deformation and damage mechanisms at the fatigue crack tip in metals, resulting in a significant decrease of crack propagation resistance. This study aims at building a model of these complex phenomena in the framework of damage mechanics, and to confront it with the results of fatigue crack propagation tests in high pressure hydrogen on a 15-5PH martensitic stainless steel. A cohesive zone model is implemented in the finite element code ABAQUS. A specific traction-separation law is developed, which is suitable for cyclic loadings, and whose parameters depend on local hydrogen concentration. Furthermore, hydrogen diffusion in the bulk material takes into account the influence of hydrostatic stress and trapping. Simulated fatigue crack propagation rates in hydrogen are compared to experimental measurements. The model ability to assess the respective contributions of the different damage mechanisms in the degradation of the crack resistance of the 15-5PH steel is discussed. (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据