A Viscoplastic Theory With Anisotropic Hardening and Its Application to Pressure-Shear Plate Impact Experiments

1985 ◽  
Vol 52 (3) ◽  
pp. 629-633 ◽  
Author(s):  
A. Gilat
Keyword(s):  
Strain Hardening ◽  
Anisotropic Hardening ◽  
Plate Impact ◽  
Hardening Model ◽  
Commercially Pure ◽  
Shear Plate ◽  
Alpha Titanium ◽  
Impact Experiments ◽  
Theory And Experiment ◽  
Good Agreement

An elastic/viscoplastic theory that includes anisotropic strain hardening is presented. The theory is a combination of the elastic/viscoplastic formulation of Perzyna [4] and the anisotropic hardening model for time-independent plasticity of Mroz [6]. The theory is used in the analysis of pressure-shear plate impact experiments on commercially pure alpha titanium. Good agreement between theory and experiment is observed.

Measurement of the behaviour of high-purity copper at very high rates of strain

1995 ◽  
Vol 73 (5-6) ◽  
pp. 295-303 ◽  
Author(s):  
Frank Kamler ◽  
P. Niessen ◽  
R. J. Pick
Keyword(s):  
Additional Data ◽  
Pure Copper ◽  
Plate Impact ◽  
Commercially Pure ◽  
Shear Plate ◽  
Split Hopkinson ◽  
Impact Experiments ◽  
Very High ◽  
Commercially Pure Copper ◽  
Good Agreement

Published measurements describing the high strain rate constitutive behaviour of oxygen-free high-conductivity (OFHC) and commercially pure copper are limited and show considerable scatter. To provide additional data, a direct impact compressive split Hopkinson bar was miniaturized to utilize specimens, 640 μm in diameter and 686 and 292 μm in length. This paper describes the design of this apparatus and results for OFHC copper. Good agreement is shown with results from pressure shear plate impact experiments.

Pressure-Shear Plate Impact Experiments at High Pressures

2020 ◽  
Vol 6 (4) ◽  
pp. 489-501
Author(s):  
C. Kettenbeil ◽  
Z. Lovinger ◽  
S. Ravindran ◽  
M. Mello ◽  
G. Ravichandran
Keyword(s):  
High Pressures ◽  
Plate Impact ◽  
Shear Plate ◽  
Impact Experiments

scholarly journals Calibration of Johnson’s damage model by a Bayesian approach

2018 ◽  
Vol 183 ◽  
pp. 01037
Author(s):  
Guillaume Perrin ◽  
Laurianne Pillon
Keyword(s):  
Free Surface ◽  
Bayesian Approach ◽  
Damage Model ◽  
Plate Impact ◽  
Impact Experiments ◽  
Good Agreement

A calibration of the Johnson’s damage model is proposed by using a Bayesian approach. A set of 3 parameters has to be adjusted. For this purpose, free surface velocities of 7 plate impact experiments leading to spallation in targets of tantalum are used. The resulting distributions of probability indicate several potential values for each parameters. Each of them used in an hydrocode leads to good agreement with reference free surface velocities.

scholarly journals Simulation of shock waves in flyer plate impact experiments

2010 ◽  
Vol 28 (4) ◽  
pp. 539-545 ◽  
Author(s):  
S. Neff ◽  
R. Presura
Keyword(s):  
Flyer Plate ◽  
Plate Impact ◽  
Simulation Code ◽  
Hydrodynamic Simulation ◽  
One Dimensional ◽  
Theoretical Predictions ◽  
Shock Hugoniot ◽  
Data Tables ◽  
Impact Experiments ◽  
Good Agreement

AbstractIn this paper we present a newly developed one-dimensional hydrodynamic simulation code and use it to determine the shock evolution in flyer plate impact experiments. The code is Lagrangian with artificial viscosity and uses shock Hugoniot data in its equation-of-state calculations instead of SESAME data tables. First shock calculations for transparent targets show a good agreement with theoretical predictions, making the code suitable for designing future flyer impact experiments at the Nevada Terawatt Facility.

scholarly journals A Theoretical and Experimental Investigation of Creep Problems With Variable Temperature

1976 ◽  
Vol 43 (4) ◽  
pp. 639-644 ◽  
Author(s):  
A. R. S. Ponter ◽  
M. H. Walter
Keyword(s):  
Experimental Investigation ◽  
Strain Hardening ◽  
Variable Temperature ◽  
Short Time Scale ◽  
Rapid Cycling ◽  
Reference Stress ◽  
Thermoelastic Stresses ◽  
Short Time ◽  
Theory And Experiment ◽  
Good Agreement

Rapid cycling solutions are presented for a simple two-bar structure subjected to variable temperature. Three constitutive relationships are considered, nonlinear viscous, strain-hardening and Bailey-Orowan models which describe differing aspects of the creep of metals. It is shown that the solutions for the viscous and strain-hardening relations are essentially similar and possess distinct reference stress histories over ranges of the governing parameters. The presence of recovery in the Bailey-Orowan model causes a distinctly different mode of behavior. Experimental results on a simulated two-bar structure are presented, under conditions where the strain-hardening hypothesis may be expected to be most relevant. Good agreement is obtained between theory and experiment although the presence of anelastic creep, with a short time scale, tends to reduce the effective thermoelastic stresses.

Finite Deformation Analysis of Pressure-Shear Plate Impact Experiments on an Elastohydrodynamic Lubricant

1992 ◽  
Vol 59 (4) ◽  
pp. 754-761 ◽  
Author(s):  
K. T. Ramesh ◽  
R. J. Clifton
Keyword(s):  
Finite Deformation ◽  
Elastic Response ◽  
Stress Wave Propagation ◽  
Lubricant Layer ◽  
Deformation Analysis ◽  
Viscoplastic Material ◽  
Plate Impact ◽  
Transit Times ◽  
Shear Plate ◽  
Impact Experiments

Pressure-shear plate impact experiments on an elastohydrodynamio lubricant (5P4E) are interpreted by means of a full finite deformation analysis of stress wave propagation in an elastic/viscoplastic material. The elastic response is modeled as that of a neo-Hookean solid, modified to include compressibility in such a way that the shock velocity increases linearly with increasing particle velocity; the viscoplastic response is modeled by means of a thermal activation model in which the activation energy is taken to be pressure dependent. The parameters in the elasticity relation are determined from the rising part of the transmitted stress profiles, which are related to transit times for multiple reverberations through the thickness of the lubricant layer. The parameters in the viscoplastic model are determined from the shear stress transmitted after nominally homogeneous states of stress are established through the thickness of the lubricant. Good agreement between measured and computed wave profiles is obtained over the entire range of pressures used in the experiments.

scholarly journals Pressure-shear plate impact experiments of magnesium at high pressures

2020 ◽  
Author(s):  
Suraj Ravindran ◽  
Zev Lovinger ◽  
Christian Kettenbeil ◽  
Michael Mello ◽  
Guruswami Ravichandran
Keyword(s):  
High Pressures ◽  
Plate Impact ◽  
Shear Plate ◽  
Impact Experiments
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