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Accession Number ADA584725
Title Contract W911NF-09-1-0111 (University of Colorado-Boulder).
Publication Date Dec 2012
Media Count 27p
Personal Author R. A. Regueiro
Abstract Using solely grain-scale physics-based simulation methods, it is too computationally intensive to account for both (I) global initial boundary value problem (IBVP) conditions, and (II) grain-scale material behavior, to understand fundamentally the mechanics of dynamic failure in bound particulate materials. The objective of the proposed research is to achieve this understanding by accounting simultaneously for grain-scale physics and macro- scale continuum IBVP conditions. To achieve the proposed objective, a concurrent computational multi-scale modeling approach will be developed that involves the following 3 features: (1) coupling regions of micromorphic continuum finite element to an 'open window' on the particulate micro-structure where localized deformation nucleates and an interface with a deformable solid body could exist; (2) converting to discrete element fragmentation modeling in micro-structural regions; and (3) adapting numerically grain-scale resolution over the material domain. The desired result is to enable a more complete understanding of the role of grain-scale physics on the thermo-mechanical properties and performance of heterogeneous bound particulate materials of interest to the Army. The contribution will be demonstrated by working with Army researchers in the Impact Physics Branch during onsite visits and through an open-source research code Tahoe where the concurrent multi-scale model will be implemented.
Keywords Continuum mechanics
De(Discrete element)
De-fe overlap coupling
Deformation
Dynamic failure
Failure(Mechanics)
Fe(Finite element)
Finite element analysis
Finite strain
Fragmentation
Ibvp(Initial boundary value problems)
Kinematics
Kinetic energy
Mechanical properties
Micromorphic
Micropolar continuum finite element coupling
Microstructure
Particulates
Potential energy
Thermomechanical properties
Three-dimensional mixed finite element implementation

 
Source Agency Non Paid ADAS
NTIS Subject Category 72B - Algebra, Analysis, Geometry, & Mathematical Logic
46E - Structural Mechanics
Corporate Author Colorado Univ. at Boulder. Dept. of Civil, Environmental, and Architectural Engineering.
Document Type Technical report
Title Note Final rept. 1 May 2009-30 Sep 2012.
NTIS Issue Number 1403
Contract Number W911NF-09-1-0111

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