The Advanced Fundamental Concrete Model: Applications to the Simulation of Projectile Penetration and Perforation

Abstract eng:
We have developed a software package called the Virtual Penetration Laboratory (VPL) that is used to automatically fit material models to laboratory material property test data [1]. VPL includes a material model driver code that drives the material model through a variety of stress/strain paths used in material property experiments, a finite element cavity expansion code to evaluate performance of the model fits and develop penetration resistance functions, an automatic model fitting module, and a graphical user interface. The automatic parameter estimation module uses Continuous Evolutionary Algorithms (CEA) [2] in conjunction with gradient methods such as the method of steepest descent. The VPL code has a variety of sophisticated constitutive models implemented in the library that can be used in the various modules included in the code. We have also implemented the material models in the EPIC [3] finite element code which provides the capability to use the models in high-fidelity numerical simulations of complex problems such as projectile penetration, embedded detonation, ground-shock, etc. The VPL code in conjunction with the EPIC finite element code provides the capability to investigate the effectiveness of material models and parameter estimation algorithms as well as the numerical methods used to simulate boundary value problems of interest. This paper includes a discussion of the Advanced Fundamental Concrete (AFC) material model as well as an overview of the methodology used to fit the model. The fidelity of the AFC model and the associated model fits are demonstrated by an examination of projectile penetration calculations. The AFC model is used to develop penetration resistance equations as well as to directly represent the concrete target in finite element simulations of penetration and perforation problems. References [1] M.D. Adley, A.O. Frank, K.T. Danielson, S.A. Akers, and J.L. O’Daniel, The Virtual Penetration Laboratory: New Developments for Projectile Penetration in High-Strength Concrete. Computational Technologies in Concrete Structures, Jeju, South Korea, May 24-27, 2009. [2] T, Furukawa, T. Sugata, S. Yoshimura, and M. Hoffman. An Automated System for Simulation and Parameter Identification of Inelastic Constitutive Models, Computer Methods in Applied Mechanics and Engineering, 191, 2235-2260, 2002. [3] G.R. Johnson, R.A. Stryk and S.R. Beissel. User Instructions for the 2001 Version of the EPIC Code. Alliant Techsystems Inc., Hopkins, MN, April 2001. Acknowledgment Permission to publish was granted by the Director, Geotechnical and Structures Laboratory. Distribution Statement Abstract approved for public release.

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