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Article Dans Une Revue Fatigue and Fracture of Engineering Materials and Structures Année : 2022

Edge tracing technique to study post‐necking behavior and failure in Al alloys and anisotropic plasticity in line pipe steels

Zacharie Shokeir
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Jacques Besson
Tom Petit
Yazid Madi

Résumé

The recently developed edge tracing (ET) method allows to estimate the radial deformation in axisymmetric tensile specimens via analysis of digital images recorded during the experiments. Images are processed to detect the sample's contours and therefore estimate the minimal cross-section diameter. This technique was mainly developed to characterize the plastic behavior well beyond the necking strain. The aim of this work is to apply the ET method to two novel case studies. Firstly, the post-necking behavior and failure of a low ductility Al alloy are investigated. Low ductility alloys tend to fail brutally after reaching the maximum load. The major result is the capture of the sharp load drop which allowed to calibrate parameters of a GTN damage model. Secondly, the anisotropic elastic-plastic behavior of a "vintage" line pipe steel is characterized by a direct measurement of the Lankford coefficient. Assembled experimental data allowed to model the anisotropic plasticity beyond necking in different loading directions.
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hal-03691084 , version 1 (08-06-2022)

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Zacharie Shokeir, Jacques Besson, Chiraz Belhadj, Tom Petit, Yazid Madi. Edge tracing technique to study post‐necking behavior and failure in Al alloys and anisotropic plasticity in line pipe steels. Fatigue and Fracture of Engineering Materials and Structures, 2022, ⟨10.1111/ffe.13754⟩. ⟨hal-03691084⟩
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