Detonation-produced hydroxyapatite coatings were studied by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Raman spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy. The source material for detonation spraying was a B-type carbonated hydroxyapatite powder. The coatings consisted of tetracalcium phosphate and apatite. The ratio depended slightly on the degre...

Behavior of blast wave in underwater explosion is of interest to metal forming community and ship designers. Underwater detonation is, also a potential hazard to the water intakes or a plant spent fuel pool. In this paper, some techniques for calculating free-field blast parameters such as pressure and impulse in underwater explosion and prediction of bubble pulsation parameters are presented a...

We study the conversion of neutron matter into strange matter as a detonation wave. The detonation is assumed to originate from a central region in a spherically symmetric background of neutrons with a varying radial density distribution. We present self-similar solutions for the propagation of detonation in static and collapsing backgrounds of neutron matter. The solutions are obtained in the ...

A “purely gasdynamic” indirect detonation initiation process is presented that can be independent of diffusion, viscosity and turbulence, and does not require direct initiation. In this process, energy is deposited into a finite volume of fluid in an amount of time that is similar to the acoustic timescale of the fluid volume. Highly resolved two-dimensional simulations show that the artificial...

The explosion of an improvised nuclear device (IND), in any American city, would cause devastating physical and social impacts. These impacts would exceed the response capabilities of any city, state or region. The potential loss and suffering caused by an IND detonation can be dramatically reduced through informed planning and preparedness. By incorporating estimates of the impacts associated ...

We establish the existence of the viscous proole of an undriven divergent detonation wave for a model problem with small viscosity. It is known that there is a sonic point inside the reaction zone of a divergent detonation wave. As a consequence, the detonation wave proole is a transonic proole and the wave speed cannot be determined before the problem is solved. The wave speed may be interpret...

Detonations and deflagration-to-detonation transition (DDT) are experimentally studied in horizontal pipes which are partially filled with water. The gas layer above the water is stoichiometric hydrogen–oxygen at 1 bar. The detonation wave produces oblique shock waves in the water, which focus at the bottom of the pipe due to the curvature of the walls. This results in peak pressures at the bot...

This paper presents an in-depth analysis on the weak turbulence detonation linear interaction problem. The emphasis is on scaling and resonance issues due to the presence of structural scales that are intrinsic to the post-shock heat release region. Natural frequencies are determined as eigenvalues of the non-forced interaction inviscid problem. Influence of detonation parameters on the set of ...

Technically relevant fluid-structure interaction simulation of detonation-induced dynamic response of thin-walled solid structures requires an efficient detonation solver that can cope with large deformations as well as arbitrary topology changes of the computational domain. We present a parallel adaptive method that uses a scalar level set function to represent embedded evolving solid boundari...

In this article, we prove stability of strong detonation waves and find their rate of convergence for a combustion model. Our results read as follows: I) There exists a global solution that converges exponentially in time to a strong detonation wave, provided that the initial data is a small perturbation of a strong detonation wave that decays exponentially in |x|. II) When the initial perturba...