کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1561015 1513924 2014 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multi-field modelling of hydride forming metals. Part I: Model formulation and validation
ترجمه فارسی عنوان
مدل سازی چند رشته ای از فلزات تشکیل دهنده هیدرید. قسمت اول: فرمول بندی و اعتبار سنجی مدل
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
چکیده انگلیسی


• A model for hydrogen behaviour in metals that form binary hydrides is presented.
• Multi-field PDEs for the involved phenomena are solved in a 3D FEM setting.
• A continuum material description with “smeared” hydrides is used.
• A cohesive zone fracture model caters for hydride induced cracking.
• The model is validated against experiments on Zr alloys.

A computational model for hydrogen transport, hydrogen induced deformation and fracture in metals that form binary hydrides, such as Zr and Ti alloys, is presented. The model uses a continuum description of the two-phase (metal + hydride) material, and solves the multi-field partial differential equations for temperature and stress-directed hydrogen diffusion together with mechanical equilibrium in a three-dimensional finite element setting. Point-kinetics models are used for metal-hydride phase transformation and stress-directed orientation of hydride precipitates, while a cohesive zone fracture model caters for initiation and propagation of cracks. The local fracture properties of the hydrided material are correlated to the calculated local concentration and orientation of the hydride precipitates, which have a strong embrittling effect on the material.In Part I of this two-part paper, we present sub-models applied for the aforementioned phenomena together with a detailed description of their numerical implementation. The applicability of the model is then demonstrated by simulating five independent experiments on hydrogen transport, metal-hydride phase transformation and stress-directed hydride orientation in zirconium alloys. Based on the results, we conclude that the model captures these phenomena over a wide range of thermo-mechanical loading conditions, including thermal cycling. Part II of the paper is focussed on fracture, and includes details on the fracture model and its validation against tests and experiments on initiation and propagation of hydride induced cracks.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 85, 1 April 2014, Pages 363–382
نویسندگان
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