Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 68, Issue -, Pages 231-247Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2014.04.013
Keywords
316L austenitic stainless steel; Notch; Micrometric component; Fatigue-life prediction; Cardiovascular stents
Funding
- Ministero dell'Istruzione, dell'Universita e della Ricerca [2010BFXRHS]
- Italian-French University (UIF-UIF) [148-30174TJ]
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The aim of the present paper is to provide an in-depth analysis of the fatigue-life assessment for Jim-size 316L stainless steel components. Such components find typical applications in the biomedical field, e.g., in cardiovascular stents. To this purpose, the present work analyzes experimental data on 316L stainless steel from literature for smooth and notched mu m-size components using a global computational approach. Several aspects are discussed: (i) the choice of an appropriate constitutive law for cyclic material behavior, (ii) fatigue criteria based on shakedown concepts for finite and infinite lifetime, in particular distinguishing between low, high and very high-cycle fatigue regimes (denoted as LCF, HCF and VHCF, respectively), and (iii) gradient effects in relation with hot-spot as well as average or mean volume approaches for the lifetime estimation. The results give a new insight into the lifetime design of Jim-size components and could be directly applied for the fatigue-life assessment of small size structures as, for instance, cardiovascular 316L stainless steel stents. (C) 2014 Elsevier Ltd. All rights reserved.
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