Mixed mode ductile fracture of an anisotropic 2024 Al-Cu alloy

Yazid Madi (1, 2) , Jacques Besson (1) , Franck Tankoua (1, 2) , Jianqiang Chen (1) , Naman Recho (2)

1 MAT - Centre des Matériaux
2 Ermess EPF

Assessment of structural integrity of structures often requires investigating the combination of tensile(Mode I) and shearing (Mode II) or tearing (Mode III) loadings. The purpose of this study is to shed some lighton the ductile mixed-mode fracture process and its underlying mechanics. Ductile rupture of a 2024 Al Alloy thinsheet is investigated under mixed-mode loading. Mechanical tests are carried out on smooth and specific mixedmodeArcan specimens. Test data on smooth samples are used to identify the parameters of constitutive equations describing plastic anisotropy. Digital image correlation (DIC) technique is used to measure the local displacement in the vicinity of the V-notch. Using these measurements an analysis of the effect of mixed-mode loading onductile crack initiation is performed. Failure mechanisms are investigated using scanning electron microscope(SEM). Results are finally interpreted and modeled using a simple local approach based on the Rice and Traceycriterion.

Mots clés: Mixed mode; ductile rupture; Rice and Tracey; Digital Image Correlation; 2024 Al-Cu

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Yazid Madi, Jacques Besson, Franck Tankoua, Jianqiang Chen, Naman Recho. Mixed mode ductile fracture of an anisotropic 2024 Al-Cu alloy. Fracture of materials and structures from micro to macro scale - ECF 18, Aug 2010, Dresden, Germany. 8 p. ⟨hal-00541089⟩