Implementation of the Johnson-Holmquist II (JH-2) Constitutive Model into DYNA3D

Gazonas, George A.

doi:10.21236/ada402347

Cited by 11 publications

(7 citation statements)

References 5 publications

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“…Their investigation included simulation of discrete micro-structure, layer modeling and consideration of continuous change of material properties. Recently, Thamburaj et al (2003) have implemented the damage model by Johnson and Holmquist (1994) into the dynamic finite element code DYNA3D (Gazonas, 2002), and investigated the effect of graded strength on damage propagation in continuously non-homogeneous materials. They observed that introducing different strength gradation can change the location of site of maximum damage, which may have important implication in the design of impact resistant materials and structures.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation and dynamic analysis of smoothly graded heterogeneous continua using graded finite elements

Zhang

Paulino

2007

International Journal of Solids and Structures

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The dynamic behavior of smoothly graded heterogeneous materials is investigated using the finite element method. The global variation of material properties (e.g., Young's modulus, Poisson's ratio and mass density) is treated at the element level using a generalized isoparametric formulation. Three classes of examples are presented to illustrate this approach and to investigate the influence of material inhomogeneity on the characteristics of wave propagation pattern and stress redistribution. First, a cantilever beam example is presented for verification purposes. Emphasis is placed on the comparison of numerical results with analytical ones, as well as modal analysis for beams with different material gradation profiles. Second, wave propagation patterns are explored for a fixed-free slender bar considering homogeneous, bi-material, tri-layered and smoothly graded materials (steel/alumina), which also provide further verification of the numerical procedures. Comparison of stress histories in these samples indicates that the smooth transition of material gradation considerably alleviates the stress discontinuity in the bi-material system (with sharp interface). Third, a three-point-bending epoxy/glass graded beam specimen is investigated for validation purposes. The beam is graded along the height direction. Stress evolution history at a location of interest is analyzed in detail, which not only reveals the dependence of stress evolution on material gradation direction, but also provides information predictive of potential material failure time for graded beams with different material gradation profiles. Jointly, these three classes of examples provide proper verification and validation for the present numerical techniques.

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Section: Introductionmentioning

confidence: 99%

Wave propagation and dynamic analysis of smoothly graded heterogeneous continua using graded finite elements

Zhang

Paulino

2007

International Journal of Solids and Structures

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“…Common to all mechanical analyses of engineering materials and their behavior in structural components is the need for constitutive models that link the states of stress and strain (Runesson, ). There are specific constitutive material models used in FEM‐based explicit dynamics analyses for brittle material modelling such as Johnson–Holmquist (JH‐I, JH‐II, and JH‐III), Drucker‐Prager Strength, and RHT Concrete damage models (ANSYS Documentation, ; Gazonas, ). Not only physical tensile/compression tests but also other mechanical experimental tests, curve‐fitting calculations and strain rate consideration are essential to define the parameters used in most of these material models (Cronin, McIntosch, Kaufmann, Bui, & Berstad, ; Murakami & Kamiya, ; Ruggiero, Iannitti, Bonora, & Ferraro, ).…”

Section: Methodsmentioning

confidence: 99%

Explicit dynamics simulation of Pecan fruit deformation under compressive loading—Part‐2: Explicit dynamics simulation procedure

Çelik

2017

J Food Process Engineering

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This study, which is divided into two parts, introduces an explicit dynamics simulation procedure for Pecan fruit (Carya illinoinensis) deformation under compressive loading. This second part of the study covers a microstructure investigation for the inner structure of the Pecan fruit components, discussions on the material models used in FEM‐based simulation, and the explicit dynamics simulation procedures. An application algorithm based on experimental and theoretical methods is described in the study. Visual understanding and/or presenting a detailed description of the deformation behavior/characteristics for agricultural products through analytical calculations or/and physical experiments is a complicated phenomenon. Most especially, this phenomenon becomes more complicated for shelled edible agricultural products under varying loading cases. Numerical method based advanced engineering simulation techniques may be useful for a deeper visual understanding of agricultural product deformation behavior/characteristics. A major focus of the second part of the study detailed in this paper is finite element method (FEM) based explicit dynamics simulation procedures and the realistic representation of time dependant nonlinear deformation of Pecan fruit (kernel‐in‐shell) under a two plate compression loading case. Simulation results pointed out that the maximum equivalent stress values were 18.10, 11.50, and 1.14 MPa for whole Pecan fruit (kernel‐in‐shell), the shell and the kernel respectively. The stress values on the kernel were beyond the defined damage point of the kernel material (0.380 MPa). This indicated a permanent deformation/damage on the kernel at the end of the defined compression case. This study contributes to further research into the utilization of nonlinear explicit dynamics based deformation simulation studies for shelled edible agricultural products. Practical applications The simulation approach and application algorithm introduced in this two‐part study is a scientific novelty because the explicit dynamics simulation approach for Pecan fruit deformation has not been previously reported in the literature. This second part introduces deeper investigations on material model description, microstructure investigation and FEM‐based explicit dynamics simulation procedures. This simulation aims to represent a realistic nonlinear deformation case of the fruit which is very difficult to obtain through experimental and/or mathematical expressions. As a further step from other researchers, this study has introduced a novel realistic time‐dependant nonlinear deformation simulation study based on experimental data. The findings have been presented in a form which may be used as input parameters in design studies for shelled agricultural product processing machinery systems used in related industries.

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“…A parameter  is used to describe the fraction of elastic energy that is converted to potential hydrostatic energy. The numerical implementation of the JH2 model for the LS-DYNA software used in this work is described in [29].…”

Section: Brittle Materials Modelmentioning

confidence: 99%

Inelastic behavior of tungsten carbide at high pressures

Kettenbeil

Lovinger

Jiao

et al. 2022

Journal of the Mechanics and Physics of Solids

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Implementation of the Johnson-Holmquist II (JH-2) Constitutive Model into DYNA3D

Cited by 11 publications

References 5 publications

Wave propagation and dynamic analysis of smoothly graded heterogeneous continua using graded finite elements

Wave propagation and dynamic analysis of smoothly graded heterogeneous continua using graded finite elements

Explicit dynamics simulation of Pecan fruit deformation under compressive loading—Part‐2: Explicit dynamics simulation procedure

Inelastic behavior of tungsten carbide at high pressures

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