Identification of forming limits at fracture using an in-plane biaxial tensile test with a dedicated cruciform specimen

Xiao Song (1) , Lionel Leotoing (1) , Dominique Guines (1) , Eric Ragneau (1)

1 LGCGM - Laboratoire de Génie Civil et Génie Mécanique

Three shapes of cruciform specimen from literatures are redesigned and their efficiencies for identifying the forming limits at fracture are considered by means of finite element numerical investigations. Based on the numerical investigation, a dedicated shape of cruciform specimen is proposed. The AA5086 and DP600 sheets with a thickness of 2mm are adopted in the in-plane biaxial tensile tests. The digital image correlation (DIC) is used to calculate the deformation field on the specimen surface. A method based on the evolution of major strain and the observation of the macroscopic image of specimen surface is proposed to identify the onset of fracture and the limit strains at fracture.

Domaines: Mécanique des matériaux [physics.class-ph]

Xiao Song, Lionel Leotoing, Dominique Guines, Eric Ragneau. Identification of forming limits at fracture using an in-plane biaxial tensile test with a dedicated cruciform specimen. ICMFF11 International Conference on Multiaxial Fatigue and Fracture, Jun 2016, Seville, Spain. ⟨hal-01361744⟩