By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Biomaterials. According to news reporting out of Galway, Ireland, by VerticalNews editors, research stated, "Fatigue of CoCr alloy stents has become a major concern in recent times, owing to cases of premature fracture, often driven by microstructural phenomena. This work presents the development of a micromechanical framework for fatigue design, based on experimental characterisation of a biomedical grade CoCr alloy, including both microscopy and mechanical testing."
Our news journalists obtained a quote from the research from National University, "Fatigue indicator parameters (FIPs) within the micromechanical framework are calibrated for the prediction of microstructure-sensitive fatigue crack initiation (FCI). A multi-scale CoCr stent model is developed, including a 3D global J(2) continuum stent-artery model and a 2D micromechanical sub-model. Several microstructure realizations for the stent sub-model allow assessment of the effect of crystallographic orientations on stent fatigue crack initiation predictions. Predictions of FCI are compared with traditional Basquin-Goodman total life predictions, revealing more realistic scatter of data for the microstructure-based FIP approach. Comparison of stent predictions with performance of a 316L stent for the same generic design exposes the design as over-conservative for the CoCr alloy."
According to the news editors, the research concluded: "In response, the micromechanical framework is used to modify the stent design for the CoCr alloy, improving design efficiency."
For more information on this research see: Experimental characterisation for micromechanical modelling of CoCr stent fatigue. Biomaterials, 2014;35(1):36-48. Biomaterials can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier - www.elsevier.com; Biomaterials - www.elsevier.com/wps/product/cws_home/30392)
Our news journalists report that additional information may be obtained by contacting C.A. Sweeney, Natl Univ Ireland, Coll Engn & Informat, Galway, Ireland. Additional authors for this research include B. O'Brien, P.E. McHugh and S.B. Leen.
Keywords for this news article include: Galway, Europe, Ireland, Biomaterials
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