scholarly journals Multiaxial fatigue criterion based on parameters from torsion and axial S-N curve

2016 ◽  
Vol 10 (37) ◽  
pp. 146-152 ◽  
Author(s):  
M. Margetin ◽  
R. Durka ◽  
V. Chmelko
Keyword(s):  
Multiaxial Fatigue ◽  
Fatigue Criterion

A computational approach based on a multiaxial fatigue criterion combining phase transformation and shakedown response for the fatigue life assessment of Nitinol stents

2018 ◽  
Vol 29 (19) ◽  
pp. 3710-3724 ◽  
Author(s):  
Giulia Scalet ◽  
Costantino Menna ◽  
Andrei Constantinescu ◽  
Ferdinando Auricchio
Keyword(s):  
Phase Transformation ◽  
Fatigue Life ◽  
Computational Design ◽  
Phase Evolution ◽  
Multiaxial Fatigue ◽  
Life Assessment ◽  
Patient Specific ◽  
Element Analysis ◽  
Nitinol Stents ◽  
Fatigue Criterion

Self-expanding stents made of Nitinol, a Nickel–Titanium shape memory alloy, are used in standard medical implants for the treatment of cardiovascular diseases. Despite the increasing success, clinical studies have reported stent failure after the deployment in the human body, thus undermining patient’s safety and life. This study aims to fill the gap of reliable assessment of the fatigue life of Nitinol stents. We propose a global computational design method for preclinical validation of Nitinol stents, which can be extended to patient-specific computations. The proposed methodology is composed of a mechanical finite element analysis and a fatigue analysis. The latter analysis is based on a novel multiaxial fatigue criterion of the Dang Van type, combining the shakedown response of the stent and the complexity of phase transformation taking place within the material. The method is implemented in the case of a carotid artery stent. The implant configuration as well as the applied cyclic loading are shown to affect material phase evolution as well as stent lifetime. The comparison with the results obtained by applying a strain-based constant-life diagram approach allows to critically discuss both fatigue criteria and to provide useful recommendations about their applicability.

A Multiaxial Fatigue Criterion for an Aluminum Alloy

2021 ◽  
pp. 140-147
Author(s):  
Hamdi Adel ◽  
Shen Chen ◽  
Talha Abderrahim ◽  
Benseddiq Noureddine
Keyword(s):  
Aluminum Alloy ◽  
Multiaxial Fatigue ◽  
Fatigue Criterion

MULTIAXIAL FATIGUE CRITERIA APPLIED TO A POLYCHLOROPRENE RUBBER

2012 ◽  
Vol 85 (1) ◽  
pp. 80-91 ◽  
Author(s):  
J. L. Poisson ◽  
S. Méo ◽  
F. Lacroix ◽  
G. Berton ◽  
N. Ranganathan
Keyword(s):  
Large Strain ◽  
Fatigue Behavior ◽  
Viscoelastic Model ◽  
Type Specimen ◽  
Multiaxial Fatigue ◽  
Dissipated Energy ◽  
Rubber Part ◽  
Phase Angles ◽  
Fatigue Criterion ◽  
Important Objective

Abstract Due to their interesting mechanical behavior and their diversity, rubber materials are more and more used in industry. Indeed, formulating a multiaxial fatigue criterion to predict fatigue lives of rubber components constitutes an important objective to conceive rubber products. An experimental campaign is developed here to study the multiaxial fatigue behavior of polychloroprene rubber. To reproduce multiaxial solicitations, combined tension–torsion tests were carried out on a dumbbell-type specimen (an axisymmetric rubber part bonded to metal parts with a reduced section at mid-height), with several values of phase angles between tension and torsion. A constitutive model is needed to calculate multiaxial fatigue criteria, and then analyze fatigue results. A large strain viscoelastic model, based on the tension–torsion kinematics, is then used to determine the material's stress–strain law. Dissipated energy density is introduced as a multiaxial fatigue criterion, and compared with those usually used in the literature. A multiaxial Haigh diagram is then built to observe the influence of Rd-ratio (ratio of the axial displacement's minimum to the axial displacement's maximum) on the multiaxial fatigue lives of polychloroprene rubber.

scholarly journals Taking into account the non-proportional loading effect on high cycle fatigue life predictions obtained by invariant-based approaches

2019 ◽  
Vol 300 ◽  
pp. 12003
Author(s):  
Lorenzo Bercelli ◽  
Cédric Doudard ◽  
Sylvain Moyne
Keyword(s):  
High Cycle Fatigue ◽  
Equivalent Stress ◽  
Multiaxial Fatigue ◽  
Proportional Loading ◽  
Industrial Structures ◽  
Complete Chain ◽  
Stress Signals ◽  
Definition Of ◽  
Life Predictions ◽  
Fatigue Criterion

Industrial structures are often subjected to multiaxial fatigue loadings. If the multiple stress signals are not synced the loading is said to be non-proportional. Most of the multiaxial fatigue criteria give highly inaccurate lifetime predictions when used in the case of such loadings. The scalar equivalent stress defined by the criteria does not take into account the non-proportional nature of the multiaxial loading and leads to non-conservative predictions. Moreover a multiaxial fatigue criterion can only be applied on a stress cycle which has no clear definition when multiple unsynced signals are to be considered. This study addresses these issues by proposing a correction of an invariant based multiaxial fatigue criterion through the definition of a non-proportional degree indicator. A definition of multiaxial cycle is also given based on the Wang-Brown method. Finally a complete chain of invariant based lifetime prediction for non-proportional multiaxial fatigue is validated.

scholarly journals A Strain-based Multiaxial Fatigue Criterion Connected to the Critical Plane Approach

2014 ◽  
Vol 74 ◽  
pp. 317-320 ◽  
Author(s):  
Andrea Carpinteri ◽  
Andrea Spagnoli ◽  
Camilla Ronchei ◽  
Sabrina Vantadori
Keyword(s):  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Critical Plane Approach ◽  
Fatigue Criterion

A multiaxial fatigue criterion for random loading

2003 ◽  
Vol 26 (6) ◽  
pp. 515-522 ◽  
Author(s):  
ANDREA CARPINTERI ◽  
ANDREA SPAGNOLI ◽  
SABRINA VANTADORI
Keyword(s):  
Multiaxial Fatigue ◽  
Random Loading ◽  
Fatigue Criterion

Predicting fatigue life of a PMMA based knee spacer using a multiaxial fatigue criterion

2011 ◽  
Vol 9 (3) ◽  
pp. 185-192 ◽  
Author(s):  
Davide Carnelli ◽  
Tomaso Villa ◽  
Dario Gastaldi ◽  
Giancarlo Pennati
Keyword(s):  
Fatigue Life ◽  
Multiaxial Fatigue ◽  
Fatigue Criterion
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