Micromechanical Fatigue Modelling of the Size Effect in Micro-Scale 316L Stainless Steel Specimens

E. Donnelly, F. M. Weafer*, T. Connolley, P.E. McHugh, M. S. Bruzzi 

College of Engineering and Informatics, National University of Ireland Galway, Ireland

DOI: 10.5185/amlett.2019.9812

Publication Date (Web): Mar 01, 2019

E-mail: fiona.weafer@gmail.com

Abstract

For many years, computational modelling and simulation studies have been used by developers to advance device design and have been reported in regulatory medical device submissions. However, cardiovascular stent materials in such computational models are typically assumed to behave as a continuum. This approach assumes that bulk material properties apply to the micro-sized structure, i.e. material behavior is scale independent. However, as size is reduced, mechanical size effects arise as the grain size to specimen width ratio drops below a critical value. These size effects cause material behavior to deviate significantly from bulk material behavior. If such a deviation in material behavior is to be captured within computational models, it is necessary to represent the crystalline structure of a metal and to capture the anisotropic behavior of individual grains within these models. This paper describes the development of such a modelling methodology to investigate the phenomenon of strain localization within grains of a 316L stainless steel specimen under fatigue loading conditions.

Keywords

Finite element, size effect, microstructure, 316L stainless steel, strain localization.

Current Issue

Artificial intelligence and machine learning empowering the mass medicine


Piezo-therapy in cancer: Current research and perspectives


Magnetic microwires for sensor applications


A fundamental study on the mechanistic impact of repeated de- and rehydration of Ca(OH)2 on thermochemical cycling in technical scale


Fabrication and characterization of nano-bridge Josephson junction based on Fe0.94Te0.45Se0.55 thin film


Riboflavin-UVA gelatin crosslinking: Design of a biocompatible and thermo-responsive biomaterial with enhanced mechanical properties for tissue engineering


Broadband and fast photodetectors based on multilayer p-MoTe2/n-WS2 heterojunction with graphene electrodes


Ionic liquid [BMIM][Cl] immobilized on cellulose fibers from pineapple leaves for desulphurization of fuels


Synthesis and role of co-dopants (alkaline earth divalents and halides) on the photoluminescence of Eu2+ doped BaAl2O4 phosphor


Metal oxide (V2O5) incorporated fly ash based geopolymer for better sustainable engineering composites


Highly efficient storage of solar gains using aluminum foam heat exchangers  


Green fabrication of zinc oxide nanospheres by aspidopterys cordata for effective antioxidant and antibacterial activity


Effect of diamantane on the thermal stability of cryomilled aluminum alloy


Previous issues

Tech-footprints for virtual medicine

Advances in corrosion inhibition materials and technologies: A review

Ring models of atoms, molecules and nanomaterials

(FeCo/Ppy@C): Pt-free FeCo-Polypyrrole Nanocomposites Supported on Porous Carbon for Electrochemical Application

Physical and mechanical properties of microwave absorber material containing micro and nano barium ferrite  

Formation of nano-dispersed Cu particles during aging of a Fe-Cu alloy and dislocation effect

Preparation of novel tragacanth gum-entrapped lecithin nanogels 

Modulation of optical properties with multilayer thickness in antimonene and indiene   

Bi-doped CH3NH3PbI3 effective masses and electronic properties research: A theoretical study using VASP

Novel synthesis of Pd nanosheets used as highly sensitive SERS substrate for trace fluorescent dye detection 

Silver nanoparticles mediated by extract of Guar plant (Cyamopsis tetragonoloba), and evaluation of their photocatalytic and antibacterial properties

Study of TiO2 nanofibers prepared by electrospinning technique

Determination of leachate pollution content in soil using in-situ dielectric measurement  

Upcoming Congress

Knowledge Experience at Sea TM