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Simulation of natural fragmentation of rings cut from warheads
(2015)
Natural fragmentation of warheads that detonates causes the casing of the warhead to split into various sized fragments through shear or radial fractures depending on the toughness, density, and grain size of the material. ...
Mathematical relations related to the lode parameter for studies of ductility
(2016)
During plastic flow, hydrostatic pressure and plastic strain control the size of the
yield surface while the Lode angle is responsible for its shape. The von Mises
yield condition shows no dependency of the Lode angle ...
Mathematical simulation of enegy expenditure and recovery during sprint cross-country skiing
(2014)
Purpose: A cross-country sprint competition relies on maximal effort durations of 3–4 minutes. Significant anaerobic energy contribution is expected. Anaerobic energy contribution has been estimated in different sports to ...
Projected area and drag coefficient of high velocity irregular fragments that rotate or tumble
(2017)
3 degrees of freedom (DOF) exterior ballistic computer models are used in fragment studies to calculate individual trajectories of each fragment based on drag coefficient and the projected (presented) area in the direction ...
On the study of ricochet and penetration in sand, water and gelatin by spheres, 7.62 mm APM2, and 25?mm projectiles
(2016)
We examine the ricochet and penetration behavior in sand, water and gelatin by steel spheres, 7.62 mm APM2 and 25 mm projectiles. A threshold impact angle (critical angle) exists beyond which ricochet cannot occur. The ...
Calculation of decomposition products from components of gunpowder by using ReaxFF reactive force field molecular dynamics and thermodynamic calculations of equilibrium composition
(2014)
The major combustion products from munitions containing nitro-based propellants are water, carbon monoxide, carbon dioxide, hydrogen and nitrogen. In addition, compounds including hydrogen cyanide, ammonia, methane, nitrogen ...
Mathematical modelling of the oxygen uptake kinetics during whole-body endurance exercise and recovery
(2017)
In this study, we elucidate four different mathematical models of the kinetics of oxygen uptake during whole-body endurance exercise at different intensities and throughout the subsequent recovery periods. We employ the ...
Studying the time trend of Methicillinresistant Staphylococcus aureus (MRSA) in Norway by use of non-stationary γ-Poisson distributions
(2015)
Objectives Study the time development of methicillin-resistant Staphylococcus aureus (MRSA) and forecast future behaviour. The major question: Is the number of MRSA isolates in Norway increasing and will it continue to ...
Introducing Randomness into First-Order and Second-Order Deterministic Differential Equations
(2010)
We incorporate randomness into deterministic theories and compare analytically and numerically some well-known stochastic theories: the Liouville process, the Ornstein-Uhlenbeck process, and a process that is Gaussian and ...
Micro indentation hardness testing of commercial-grade RDX crystals
(2016)
This paper describes the continuous micro indentation hardness testing of two
commercial grades of RDX with differing shock sensitivities using three (3)
different loads on a Berkovich indenter to obtain values of elastic ...