An Automated Process to Generate Constitutive Models for Granular Mixtures Using LIGGGHTS

The procedure of automated process reliability evaluation is developed in order to prevent recurrent defects in parts manufactured by die stamping. The procedure is based on the analysis of such factors as part design, material, its mechanical and physical properties; equipment parameters, tool performance, etc. The list of reliability factors may vary according to type of operation as deformation process is different for each group of operations. The adjustment of stamping process reliability performance prevents any defects emerging during production of critical parts as early as the work preparation stage.

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EVALUATION OF PLASTICITY-BASED SOIL CONSTITUTIVE MODELS IN SIMULATION OF BRACED EXCAVATION

International Journal of Geomate ◽

10.21660/2013.10.3328 ◽

2013 ◽

Cited By ~ 1

Author(s):

Samuel J. Verghese

Keyword(s):

Constitutive Models ◽

Braced Excavation ◽

Soil Constitutive Models

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Modeling and simulation of three-dimensional planar contraction flow of viscoelastic fluids with PTT, Giesekus and FENE-P constitutive models

Applied Mathematics and Computation ◽

10.1016/j.amc.2012.01.067 ◽

2012 ◽

Vol 218 (17) ◽

pp. 8429-8443 ◽

Cited By ~ 9

Author(s):

Yue Mu ◽

Guoqun Zhao ◽

Xianghong Wu ◽

Jiqiang Zhai

Keyword(s):

Modeling And Simulation ◽

Three Dimensional ◽

Constitutive Models ◽

Viscoelastic Fluids ◽

Contraction Flow ◽

Planar Contraction

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An experimental method for evaluating constitutive models of myocardium in in vivo hearts

AJP Heart and Circulatory Physiology ◽

10.1152/ajpheart.1994.267.2.h853 ◽

1994 ◽

Vol 267 (2) ◽

pp. H853-H863 ◽

Cited By ~ 5

Author(s):

L. L. Creswell ◽

M. J. Moulton ◽

S. G. Wyers ◽

J. S. Pirolo ◽

D. S. Fishman ◽

...

Keyword(s):

Experimental Method ◽

Diastolic Pressure ◽

Constitutive Models ◽

Fe Analysis ◽

Small Displacement ◽

Ventricular Wall ◽

Canine Heart ◽

Unknown Parameters ◽

Tissue Tagging

A new experimental method for the evaluation of myocardial constitutive models combines magnetic resonance (MR) radiofrequency (RF) tissue-tagging techniques with iterative two-dimensional (2-D) nonlinear finite element (FE) analysis. For demonstration, a nonlinear isotropic constitutive model for passive diastolic expansion in the in vivo canine heart is evaluated. A 2-D early diastolic FE mesh was constructed with loading parameters for the ventricular chambers taken from mean early diastolic-to-late diastolic pressure changes measured during MR imaging. FE solution was performed for regional, intramyocardial ventricular wall strains using small-strain, small-displacement theory. Corresponding regional ventricular wall strains were computed independently using MR images that incorporated RF tissue tagging. Two unknown parameters were determined for an exponential strain energy function that maximized agreement between observed (from MR) and predicted (from FE analysis) regional wall strains. Extension of this methodology will provide a framework in which to evaluate the quality of myocardial constitutive models of arbitrary complexity on a regional basis.

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