MESA 3-D calculations of armor penetration by projectiles with combined obliquity and yaw

Cagliostro, D.J.; Mandell, D.A.; Schwalbe, L.A.; Adams, Thomas F.; Chapyak, E.J.

doi:10.1016/0734-743x(90)90050-6

Cited by 38 publications

(14 citation statements)

References 4 publications

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“…1 when the shock is -1 cm from the end of the driver. The calculations (all hydrodynamic calculations discussed hem were done with MESA/2D (Cagliostro et al,, 1990)) are in good agreement with radiographs showing the detonation front and flat shock in /he foam. The lack of radial variation of the pressure (also density and axial velocitv) contours behind the shock shows that this flow is radially uniform, This condition is necessary to achieve a sustained, uniform acceleration.…”

Section: Introductionsupporting

confidence: 52%

Problems associated with launching hypervelocity projectiles from the fast shock tube

Kerrisk

Meier

1993

International Journal of Impact Engineering

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Modeling and experiments are being done with the goal of understanding the physics of projectile acceleration at high driving pressures (megabar range) and short acceleration times (a few microseconds) well enough to design and test successful hypervelocity launch systems, The Fast Shock Tube, a cylindrically convergent high-explosive driver, has been used to accelerate projectiles.Detailed modeling of the experiments, including high-pressure gas flow, projectile instability, and projectile fracture, has been done with MESIV2D. Modeling results show quantitative agreement with the average behavior of the system. However, details of projectile behavior are not predicted well. Observed velocity distributions across the diameter of a projectile or projectile shapes are only in qualitative agreement with calculations. This, then, presents the major constraint on the successful design of a launch system: that the processes that limit projectile integrity depend on the details of the drive conditions, and these details are not quantitatively modeled at this time.

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Section: Introductionsupporting

confidence: 52%

Problems associated with launching hypervelocity projectiles from the fast shock tube

Kerrisk

Meier

1993

International Journal of Impact Engineering

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“…code [27]. EKF was designed to optimize predictions of, as well as reduce uncertainties in, the modeled state variables, provided that the errors of observations and model performance are known.…”

Section: Discussionmentioning

confidence: 99%

“…We investigate the performance of EKF for simple flyer plate experiments in a one-dimensional (1-D) set-up where most of its nonlinearity is fairly well understood [1,29]. The numerical model we use in this study is the 1-D version of the MESA code (MESA-1D) [27], which includes a sophisticated reconstruction of the material interface [28].…”

Section: Introductionmentioning

confidence: 99%

Data assimilation with an extended Kalman filter for impact-produced shock-wave dynamics

Kao

Flicker

Henninger

et al. 2004

Journal of Computational Physics

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Model assimilation of data strives to determine optimally the state of an evolving physical system from a limited number of observations. The present study represents the first attempt of applying the extended Kalman filter (EKF) method of data assimilation to shock-wave dynamics induced by a high-speed impact. EKF solves the full nonlinear state evolution and estimates its associated error-covariance matrix in time. The state variables obtained by the blending of past model evolution with currently available data, along with their associated minimized errors (or uncertainties), are then used as initial conditions for further prediction until the next time at which data becomes available.In this study, a one-dimensional (1-D) finite-difference code is used along with data measured from a 1-D flyer plate experiment. An ensemble simulation suggests that the nonlinearity of the modeled system can be reasonably tracked by EKF. The results demonstrate that the EKF assimilation of a limited amount of pressure data, measured at the middle of the target plate alone, helps track the evolution of all the state variables.The fidelity of EKF is further investigated with numerically generated synthetic data from so-called "identical-twin experiments", in which the true state is known and various measurement techniques and strategies can be made easily simulated. We find that the EKF method can effectively assimilate the density fields, which are distributed sparsely in time to mimic radiographic data, into the modeled system. 2

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“…Before this, though, secondary shocks and rarefactions continue to increase heat and smooth the pressure profile, respectively. An upper bound on E 8 is El itself, so we have,…”

Section: _ Rhc C2ai02lcomentioning

confidence: 99%

Adiabatic, Shock, and Plastic Work Heating of Solids and the Cylinder Test

Ruden¹,

Kiuttu²

2000

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Aberdeen Ave SEKirtland AFB, NM 87117-5776 SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)10. SPONSORING / MONITORING AGENCY REPORT NUMBER SUPPLEMENTARY NOTES ABSTRACT (Maximum 200 Words)Solids subjected to high pressures, shocks, and/or deformation experience an increase in internal energy density and temperature due to adiabatic compression, shock heating, and plastic work heating, respectively. Analytic approximations are derived here for the internal energy and temperature changes that result from these processes based on the analytic constitutive model and Grilneisen equation of state of D. Steinberg. Although of general use, the utility of the expressions is demonstrated by the detailed example of a cylindrical metal tube filled with high explosives. and detonated on axis at one end. This geometry is often used to determine the detonation properties of high explosives, where it is known as the "cylinder test". The geometry is also of special interest for use as the armature of cylindrical magnetic flux compression pulsed current generators. The results are favorably compared with two dimension numerical simulations of the process using Lawrence Livermore National Laboratory's shock-hydro computer code GALE using the same model for the metal. BHeating ................................................... 4 Example - Explosively Expanded Tube .......................................... Typeset using REVTEX Abstract Solids subjected to high pressures, shocks, and/or deformation experience an increase in internal energy density and temperature due to adiabatic compression, shock heating, and plastic work heating, respectively. Analytic approximations are derived here for the internal energy and temperature changes that result from these processes based on the analytic constitutive model and with two dimension numerical simulations of the process using Lawrence Livermore National Laboratory's shock-hydro computer code GALE using the same model for the metal. SUBJECT TERMS 15. NUMBER OF PAGES

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MESA 3-D calculations of armor penetration by projectiles with combined obliquity and yaw

Cited by 38 publications

References 4 publications

Problems associated with launching hypervelocity projectiles from the fast shock tube

Problems associated with launching hypervelocity projectiles from the fast shock tube

Data assimilation with an extended Kalman filter for impact-produced shock-wave dynamics

Adiabatic, Shock, and Plastic Work Heating of Solids and the Cylinder Test

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