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.
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 elastic–plastic behavior well beyond the necking
strain. The aim of this work is to extend the ET method to two 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 in different loading
directions.
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