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Fatigue crack growth law identification by Digital Image Correlation and electrical potential method for ductile cast iron

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2017
auteur(s) Hosdez Jérôme; Witz Jean-François; Martel Corentin; Limodin Nathalie; Najjar Denis; Charkaluk Eric; Osmond Pierre; Szmytka Fabien
journal (abréviation) Engineering Fracture Mechanics (Eng Fract Mech)
  
  Sous presse
résumé In this paper, a comparison between two methods used to identify fatigue crack propagation law is conducted: Digital Image Correlation (DIC) and Direct Current Potential Drop (DCPD). For this purpose, fatigue tests were conducted at R-ratio of 0.1 on a ductile cast iron commonly used for exhaust manifolds manufacturing. Results show a good agreement between the methods illustrating the accuracy of each technique for the analysis of fatigue crack growth. Moreover, an interest of DIC is also to allow studying the plasticity that occurs at the crack tip during the fatigue test.
mots clés Digital image correlation; Direct current potential drop; Fatigue; Stress intensity factor; Paris law; Plasticity
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