Failure of the Chapman-Jouguet Theory for Liquid and Solid Explosives

Davis, William C.; Craig, B.G.; Ramsay, J.B.

doi:10.1063/1.1761177

Cited by 36 publications

(15 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since it is not known how to adjust the data for temperature, we will use the data as given. The value of y was obtained by using the results of Davis, Craig & Ramsay (1965). At 4 "C they give an initial density of 1.159 g 0111-3, a detonation velocity of 6374 m s-l, and a Chapman-Jouguet pressure of 12.2 GPa, which yields y = 2-86,…”

Section: J B Bdxilmentioning

confidence: 99%

Steady-state two-dimensional detonation

Bdzil

1981

J. Fluid Mech.

129

View full text Add to dashboard Cite

An analytical steady-state theory of the detonation ‘diameter effect’ is presented. This theory, which includes the off-axis flow, is a generalization of the Wood-Kirkwood analysis. When the state dependence of the reaction rate is stronger than that of the product of the sound speed squared and the flow divergence, detonation failure can occur. The leading term in the extrapolation of the detonation velocity to infinite charge size is quadratic in the inverse charge size and not linear as popularly believed. When calibrated to the detonation velocity vs. charge-size data, the theory reproduces the limited amount of experimental shock loci to a high degree of accuracy.

show abstract

Section: J B Bdxilmentioning

confidence: 99%

Steady-state two-dimensional detonation

Bdzil

1981

J. Fluid Mech.

129

View full text Add to dashboard Cite

show abstract

“…Detonation parameters calculated by the Rx2CJ method, compared with experimental data[38][39][40][41] Detonation products predicted at the CJ state in RDX, PETN, and HMX, compared to calorimeter bomb experiment37,43 Number of atoms (% of system total) included in the above products. b Some small aggregates still exist at such high temperature and pressure conditions in the CJ state.…”

mentioning

confidence: 99%

Prediction of the Chapman–Jouguet chemical equilibrium state in a detonation wave from first principles based reactive molecular dynamics

Guo

Zybin

et al. 2016

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The combustion or detonation of reacting materials at high temperature and pressure can be characterized by the Chapman-Jouguet (CJ) state that describes the chemical equilibrium of the products at the end of the reaction zone of the detonation wave for sustained detonation. This provides the critical properties and product kinetics for input to macroscale continuum simulations of energetic materials. We propose the ReaxFF Reactive Dynamics to CJ point protocol (Rx2CJ) for predicting the CJ state parameters, providing the means to predict the performance of new materials prior to synthesis and characterization, allowing the simulation based design to be done in silico. Our Rx2CJ method is based on atomistic reactive molecular dynamics (RMD) using the QM-derived ReaxFF force field. We validate this method here by predicting the CJ point and detonation products for three typical energetic materials. We find good agreement between the predicted and experimental detonation velocities, indicating that this method can reliably predict the CJ state using modest levels of computation.

show abstract

“…Plate-push measurements off the end of HE cylinders by Davis, Craig, and Ramsay [5] showed that the reaction zone length grew with charge length, which is not predicted by either the CJ or ZND theories for ideal detonations. Bdzil and Davis [6] explained these results by using a chemical reaction model allowing reaction behind the sonic zone that creates perturbations.…”

Section: Non-ideal Explosive's Evidence Of Late-time Energy Releasementioning

confidence: 95%

Steady Detonation Waves in Right Circular Cylinders of Non-ideal Explosives

Forbes

2012

Shock Wave Compression of Condensed Matter

View full text Add to dashboard Cite

This chapter overviews the detonation properties in right circular cylinders of non-ideal HE's. This requires some understanding of 2-D hydrodynamic flow and modified ZND theory for non-ideal HE's. This chapter will first cover the modified ZND detonation theory for non-ideal HE's. Then a review of experimental techniques using right circular cylindrical samples will be presented since detonation science's understanding is primarily based on the large experimental data base from cylindrical samples. This will be followed by curved detonation front theory for right circular cylindrical samples and a brief overview of select 2-D flow conditions.Most explosive detonation wave properties are obtained from finite size right circular cylindrical HE samples so it is important to understand how this cylinder geometry effects detonation properties for HE's. Two important features are curved wave fronts and size dependence of properties. Detonation velocities are a functions of diameter (velocity decrement data), initial density, and confinement. Ideal explosives exhibit slight detonation velocity size dependence only near its failure diameter and then fail to propagate a steady detonation wave for smaller diameters. Non-ideal explosives have large variation of detonation velocities as a function of size compared to ideal explosives. Experimental data presented on non-ideal PBXN-111 will demonstrate this feature.The CJ detonation model does not treat the detonation velocity dependencies as a function of charge size. A modified ZND model can explain some of the detonation velocities properties and allows the determination of the sonic reaction zone length. Neither detonation model directly treats the strong dependency of detonation wave velocity on initial density. Non-ideal ExplosivesThe simplest definition of a non-ideal HE is that energy release continues beyond the sonic plane of a steady detonation front [1,2]. Recall the sonic point behind the steady detonation front is where D ¼ u products + c products . Energy release J.W. Forbes, Shock Wave Compression of Condensed Matter, Shock Wave and High Pressure Phenomena,

show abstract

Failure of the Chapman-Jouguet Theory for Liquid and Solid Explosives

Cited by 36 publications

References 14 publications

Steady-state two-dimensional detonation

Steady-state two-dimensional detonation

Prediction of the Chapman–Jouguet chemical equilibrium state in a detonation wave from first principles based reactive molecular dynamics

Steady Detonation Waves in Right Circular Cylinders of Non-ideal Explosives

Contact Info

Product

Resources

About