TY - GEN
T1 - A physically motivated internal state variable plasticity/damage model embedded with a length scale for hazmat tank cars' structural integrity applications
AU - Ahad, Fazle R.
AU - Enakoutsa, Koffi
AU - Solanki, Kiran N.
AU - Tjipowidjojo, Yustianto
AU - Bammann, Douglas J.
PY - 2011
Y1 - 2011
N2 - In this study, we use a physically-motivated internal state variable plasticity/damage model containing a mathematical length scale to represent the material behavior in finite element (FE) simulations of a large scale boundary value problem. This problem consists of a moving striker colliding against a stationary hazmat tank car. The motivations are (1) to reproduce with high fidelity finite deformation and temperature histories, damage, and high rate phenomena which arise during the impact and (2) to address the pathological mesh size dependence of the FE solution in the post-bifurcation regime. We introduce the mathematical length scale in the model by adopting a nonlocal evolution equation for the damage, as suggested by Pijaudier-Cabot and Bazant (1987) in the context of concrete. We implement this evolution equation into existing implicit and explicit versions of the FE subroutines of the plasticity/failure model. The results of the FE simulations, carried out with the aid of Abaqus/Explicit FE code, show that the material model, accounting for temperature histories and nonlocal damage effects, satisfactorily predicts the damage progression during the tank car impact accident and significantly reduces the pathological mesh size effects.
AB - In this study, we use a physically-motivated internal state variable plasticity/damage model containing a mathematical length scale to represent the material behavior in finite element (FE) simulations of a large scale boundary value problem. This problem consists of a moving striker colliding against a stationary hazmat tank car. The motivations are (1) to reproduce with high fidelity finite deformation and temperature histories, damage, and high rate phenomena which arise during the impact and (2) to address the pathological mesh size dependence of the FE solution in the post-bifurcation regime. We introduce the mathematical length scale in the model by adopting a nonlocal evolution equation for the damage, as suggested by Pijaudier-Cabot and Bazant (1987) in the context of concrete. We implement this evolution equation into existing implicit and explicit versions of the FE subroutines of the plasticity/failure model. The results of the FE simulations, carried out with the aid of Abaqus/Explicit FE code, show that the material model, accounting for temperature histories and nonlocal damage effects, satisfactorily predicts the damage progression during the tank car impact accident and significantly reduces the pathological mesh size effects.
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U2 - 10.1115/JRC2011-56063
DO - 10.1115/JRC2011-56063
M3 - Conference contribution
AN - SCOPUS:84860249740
SN - 9780791854594
T3 - 2011 Joint Rail Conference, JRC 2011
SP - 263
EP - 272
BT - 2011 Joint Rail Conference, JRC 2011
T2 - 2011 Joint Rail Conference, JRC 2011
Y2 - 16 March 2011 through 18 March 2011
ER -