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On the identifiability of Hill‐1948 plasticity model with a single biaxial test on very thin sheet
Author(s) -
Bertin Morgan,
Hild François,
Roux Stéphane
Publication year - 2017
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/str.12233
Subject(s) - identifiability , digital image correlation , characterization (materials science) , plasticity , sensitivity (control systems) , constitutive equation , calibration , identification (biology) , materials science , boundary (topology) , experimental data , structural engineering , mechanics , algorithm , computer science , mathematical analysis , mathematics , composite material , engineering , physics , electronic engineering , statistics , nanotechnology , botany , finite element method , biology
One biaxial experiment is performed on an ultrathin specimen made of 17‐7 precipitation hardened stainless steel. An antiwrinkling setup allows for the characterization of the mechanical behavior with integrated digital image correlation. A sensitivity analysis assesses the amount of data available but reveals a discrepancy between observation and model that is interpreted as the occurrence of wrinkling in a confined boundary layer. From this observation, the identification is performed on a refined region of interest where reliable data are accessible. The calibration of parameters of various constitutive equations is performed. In particular, the identifiability of the so‐called Hill‐1948 model is analyzed.