alexa Coupling Diffusion And Mechanics Modeling For Hydrogen Embrittlement (HE)
ISSN: 2169-0022

Journal of Material Sciences & Engineering
Open Access

OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific Societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

Open Access Journals gaining more Readers and Citations

700 Journals and 15,000,000 Readers Each Journal is getting 25,000+ Readers

This Readership is 10 times more when compared to other Subscription Journals (Source: Google Analytics)

Share This Page

Additional Info

Loading
Loading Please wait..
 

9th World Congress on Materials Science and Engineering
June 12-14, 2017 Rome, Italy

Olga Barrera and Alan Cocks
University of Oxford, UK
ScientificTracks Abstracts: J Material Sci Eng
DOI: 10.4172/2169-0022-C1-067
Abstract
This work deals with modeling HE mechanisms in high strength steels. The aim is to elucidate two failure mechanisms in the presence of hydrogen: Hydrogen induced local plasticity (HELP) and hydrogen induced decohesion (HID). The HELP theory suggests that hydrogen, in contrast to the usual understanding of embrittlement, enhances the dislocation mobility and promotes slip localization, resulting in localized plastic failure. Furthermore, hydrogen reduces the bonding energy between atoms leading to decohesion. The HID mechanism might explain the brittle intergranular fracture surface observed in high strength steels. Experimental evidence of the occurrence of HELP versus HID or, more probably, their synergetic effect, is still an unresolved issue. Hydrogen atoms can accumulate, either within the matrix or at interfaces (i.e., between particles and the surrounding matrix, or grain boundaries) affecting the mechanical response of the material. We construct a finite element model in order to simulate the mechanical behavior of the matrix and interface coupled with hydrogen transport. We also include simple kinetic models of the flux of atoms into (and out of) an interface. We combine this understanding with micromechanical models of the interaction of dislocations with particles and with empirical models of the effect of hydrogen on interface decohesion and plastic deformation to provide a set of coupled constitutive equations for hydrogen transport and mechanical behavior. With this modeling framework, we aim to identify and explore the conditions under which HELP or HID or both mechanisms are activated. In particular, we model the failure of high strength steels which contain a distribution of nano-scale particles. We simulate the response in hydrogen and hydrogen-free environments and identify the conditions under which hydrogen can lead to: (1) a quasi-brittle macroscopic response through localization of plastic deformation facilitated by decohesion at the particle/matrix interface or (2) a brittle intergranular fracture process.
Biography

Olga Barrera is a Senior Research Associate at the University of Oxford. Her expertise is in the field of computational mechanics and computational material modeling. Her research focuses on solving a range of coupled diffusion mechanics problems focused on understanding the failure process of a number of material systems. She also has experience in applying the wide range of skills developed in the fields of materials modeling and computational solid mechanics to solve exciting and important problems in parallel disciplines such as biomechanics.

Email: olga.barrera@eng.ox.ac.uk

image PDF   |   image HTML
 

Relevant Topics

Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

Agri, Food, Aqua and Veterinary Science Journals

Dr. Krish

agrifoodaquavet@omicsonline.com

1-702-714-7001 Extn: 9040

Clinical and Biochemistry Journals

Datta A

clinical_biochem@omicsonline.com

1-702-714-7001Extn: 9037

Business & Management Journals

Ronald

business@omicsonline.com

1-702-714-7001Extn: 9042

Chemical Engineering and Chemistry Journals

Gabriel Shaw

chemicaleng_chemistry@omicsonline.com

1-702-714-7001 Extn: 9040

Earth & Environmental Sciences

Katie Wilson

environmentalsci@omicsonline.com

1-702-714-7001Extn: 9042

Engineering Journals

James Franklin

engineering@omicsonline.com

1-702-714-7001Extn: 9042

General Science and Health care Journals

Andrea Jason

generalsci_healthcare@omicsonline.com

1-702-714-7001Extn: 9043

Genetics and Molecular Biology Journals

Anna Melissa

genetics_molbio@omicsonline.com

1-702-714-7001 Extn: 9006

Immunology & Microbiology Journals

David Gorantl

immuno_microbio@omicsonline.com

1-702-714-7001Extn: 9014

Informatics Journals

Stephanie Skinner

omics@omicsonline.com

1-702-714-7001Extn: 9039

Material Sciences Journals

Rachle Green

materialsci@omicsonline.com

1-702-714-7001Extn: 9039

Mathematics and Physics Journals

Jim Willison

mathematics_physics@omicsonline.com

1-702-714-7001 Extn: 9042

Medical Journals

Nimmi Anna

medical@omicsonline.com

1-702-714-7001 Extn: 9038

Neuroscience & Psychology Journals

Nathan T

neuro_psychology@omicsonline.com

1-702-714-7001Extn: 9041

Pharmaceutical Sciences Journals

John Behannon

pharma@omicsonline.com

1-702-714-7001Extn: 9007

Social & Political Science Journals

Steve Harry

social_politicalsci@omicsonline.com

1-702-714-7001 Extn: 9042

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords