Dynamic failure of viscoplastic structures under ASB and micro-voiding
Université de Toulouse, UT3–UPS, ISAE-SUPAERO, Institut Clément Ader (CNRS 5312),
* Corresponding author : firstname.lastname@example.org
Published online: 7 September 2018
Adiabatic shear bands are known to cause premature structural failure in high strength metals and alloys. The observation of adiabatic shear bands inside partially fractured specimens evidences the presence of micro-voids as the precursor of the ultimate failure. An enriched model containing the effects of adiabatic shear banding and micro-voiding mechanisms was developed and it is here taken through a calibration procedure. The aim of the present work is to evaluate the performances of the enriched model considering an initial-boundary value problem. To that purpose, the model has been implemented as user material in the engineering finite element computation code LS-DYNA. Numerical simulation of the dynamic shearing of hat shaped structures is conducted and the interest of accounting for the pre-failure stage consisting of micro-voiding in the ASB wake is emphasized.
© The Authors, published by EDP Sciences, 2018
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