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Title: Fourier amplitude sensitivity test applied to dynamic combined finite-discrete element methods-based simulations

Abstract

Fracture propagation plays a key role for a number of applications of interest to the scientific community, from dynamic fracture processes like spallation and fragmentation in metals to failure of ceramics, airplane wings, etc. Simulations of material deformation and fracture propagation rely on accurate knowledge of material characteristics such as material strength and the amount of energy being dissipated during the fracture process. Within the combined finite-discrete element method (FDEM) framework material fracture behavior is typically described through a parametrized softening curve, which defines a stress-strain relationship unique to each material. We apply the Fourier amplitude sensitivity test to explore how each of these parameters influences the simulated damage processes and to determine the key input parameters that have the most impact on the model response. We present several sensitivity numerical experiments for the simulation of a split Hopkinson pressure bar (SHPB) test for weathered granite samples using different combinations of model parameters. We validate the obtained results against SHPB experimental data. The experiments show that the model is mostly sensitive to parameters related to tensile and shear strengths, even in the presence of other parameter perturbations. Lastly, the results suggest that the specification of tensile and shear strengths atmore » the interfaces dominate the stress-time history of the FDEM simulation of SHPB test.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1481141
Alternate Identifier(s):
OSTI ID: 1484962
Report Number(s):
LA-UR-17-31209
Journal ID: ISSN 0363-9061
Grant/Contract Number:  
AC52-06NA25396; LDRD 20170103DR
Resource Type:
Accepted Manuscript
Journal Name:
International Journal for Numerical and Analytical Methods in Geomechanics
Additional Journal Information:
Journal Volume: 43; Journal Issue: 1; Journal ID: ISSN 0363-9061
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Mathematics; Material Science; Fourier Amplitude Sensitivity Test, Finite-Discrete Element Method

Citation Formats

Godinez Vazquez, Humberto C., Rougier, Esteban, Osthus, David Allen, Lei, Zhou, Knight, Earl E., and Srinivasan, Gowri. Fourier amplitude sensitivity test applied to dynamic combined finite-discrete element methods-based simulations. United States: N. p., 2018. Web. doi:10.1002/nag.2852.
Godinez Vazquez, Humberto C., Rougier, Esteban, Osthus, David Allen, Lei, Zhou, Knight, Earl E., & Srinivasan, Gowri. Fourier amplitude sensitivity test applied to dynamic combined finite-discrete element methods-based simulations. United States. doi:10.1002/nag.2852.
Godinez Vazquez, Humberto C., Rougier, Esteban, Osthus, David Allen, Lei, Zhou, Knight, Earl E., and Srinivasan, Gowri. Wed . "Fourier amplitude sensitivity test applied to dynamic combined finite-discrete element methods-based simulations". United States. doi:10.1002/nag.2852. https://www.osti.gov/servlets/purl/1481141.
@article{osti_1481141,
title = {Fourier amplitude sensitivity test applied to dynamic combined finite-discrete element methods-based simulations},
author = {Godinez Vazquez, Humberto C. and Rougier, Esteban and Osthus, David Allen and Lei, Zhou and Knight, Earl E. and Srinivasan, Gowri},
abstractNote = {Fracture propagation plays a key role for a number of applications of interest to the scientific community, from dynamic fracture processes like spallation and fragmentation in metals to failure of ceramics, airplane wings, etc. Simulations of material deformation and fracture propagation rely on accurate knowledge of material characteristics such as material strength and the amount of energy being dissipated during the fracture process. Within the combined finite-discrete element method (FDEM) framework material fracture behavior is typically described through a parametrized softening curve, which defines a stress-strain relationship unique to each material. We apply the Fourier amplitude sensitivity test to explore how each of these parameters influences the simulated damage processes and to determine the key input parameters that have the most impact on the model response. We present several sensitivity numerical experiments for the simulation of a split Hopkinson pressure bar (SHPB) test for weathered granite samples using different combinations of model parameters. We validate the obtained results against SHPB experimental data. The experiments show that the model is mostly sensitive to parameters related to tensile and shear strengths, even in the presence of other parameter perturbations. Lastly, the results suggest that the specification of tensile and shear strengths at the interfaces dominate the stress-time history of the FDEM simulation of SHPB test.},
doi = {10.1002/nag.2852},
journal = {International Journal for Numerical and Analytical Methods in Geomechanics},
number = 1,
volume = 43,
place = {United States},
year = {2018},
month = {8}
}

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