Modeling the dynamic failure of railroad tank cars using a physically motivated internal state variable plasticity/damage nonlocal model

Fazle R. Ahad, Koffi Enakoutsa, Kiran Solanki, Yustianto Tjiptowidjojo, Douglas J. Bammann

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We used a physically motivated internal state variable plasticity/damage model containing a mathematical length scale to idealize the material response in finite element simulations of a large-scale boundary value problem. The 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 that may arise during the impact accident and (2) to address the material postbifurcation regime pathological mesh size issues. 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 in the context of concrete. We implement this evolution equation into existing finite element subroutines of the plasticity/failure model. The results of the simulations, carried out with the aid of Abaqus/Explicit finite element 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.

Original languageEnglish (US)
Article number815158
JournalModelling and Simulation in Engineering
Volume2013
DOIs
StatePublished - 2013

Fingerprint

Tank cars
Railroads
Plasticity
Damage
Internal
Modeling
Accidents
Length Scale
Evolution Equation
Mesh
Subroutines
Finite Element
Nonlocal Equations
Finite Deformation
Model
Boundary value problems
Size Effect
Finite Element Simulation
Finite Temperature
Progression

ASJC Scopus subject areas

  • Computer Science Applications
  • Modeling and Simulation
  • Engineering(all)

Cite this

Modeling the dynamic failure of railroad tank cars using a physically motivated internal state variable plasticity/damage nonlocal model. / Ahad, Fazle R.; Enakoutsa, Koffi; Solanki, Kiran; Tjiptowidjojo, Yustianto; Bammann, Douglas J.

In: Modelling and Simulation in Engineering, Vol. 2013, 815158, 2013.

Research output: Contribution to journalArticle

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