The detonation cylinder test: Determination of full wall velocity and shape from a single velocimetry probe with an arbitrary angle

Jackson, Steve

doi:10.1063/1.4971551

Cited by 8 publications

(15 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculation of the flyer plate deflection angle was inspired by evaluation of cylinder test [14,15,23,24]. An equation for the tube movement, as described in [23,24], was used to fit the velocity data from PDV.…”

Section: Calculation Of the Flyer Plate Deflection Anglementioning

confidence: 99%

“…An equation for the tube movement, as described in [23,24], was used to fit the velocity data from PDV. The calculation of the flyer plate deflection angle is also analogy of the approach published for the cylinder test [15].…”

Section: Calculation Of the Flyer Plate Deflection Anglementioning

confidence: 99%

“…In the case of cylinder test, the wall velocity (as measured by the PDV probe) can be decomposed into two components -radial and axial components [14,15]. If the same procedure is used in planar configuration, the perpendicular and longitudinal velocity components can be defined.…”

Section: Decomposition Of the Flyer Velocitymentioning

confidence: 99%

“…The ratio of these components defines also the actual plate angle in dependence on the standoff distance (collision angle, if the base plate would be in a particular standoff distance). This approach was described for the cylinder test [14,15], however it may be used also for the planar configuration.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Determination of Acceleration of Explosively Driven Metal by Photonic Doppler Velocimetry in the Process of Explosive Welding

Kučera

Anastacio

Nesvadba

et al. 2018

Propellants Explo Pyrotec

View full text Add to dashboard Cite

Two important parameters reflect in the quality of the interface of two explosively welded metal plates – impact velocity and collision angle. Both parameters can be determined from the knowledge of velocity history of the accelerated surface. A suitable measurement methodology that would allow in‐situ determination of the course of acceleration at a technological scale experiments is however not yet available. One of the emerging options enabling such measurements is Photonic Doppler Velocimetry (PDV). This paper focuses on the issues observed during measurement of metal plate acceleration in explosive welding using this technique. A well‐known combination in which copper plate is accelerated by detonation and welded to a steel baseplate was chosen for small scale experiments. The methodology was further employed at a large scale technological tests were two different steel plates were joined by detonation. The PDV proved to be successful in determination of the entire velocity history and provides unprecedented insight into the welding process. The knowledge of the velocity time history enables optimization of the impact velocity and collision angle without having to modify the explosive composition. A methodology of velocity measurement of the entire velocity profile of accelerated plate and its collision velocity during metal welding was developed. In addition, we are proposing a new way of optimizing welding parameters based on the exact velocity and thus a collision angle calculation.

show abstract

Section: Calculation Of the Flyer Plate Deflection Anglementioning

confidence: 99%

Section: Calculation Of the Flyer Plate Deflection Anglementioning

confidence: 99%

Section: Decomposition Of the Flyer Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Determination of Acceleration of Explosively Driven Metal by Photonic Doppler Velocimetry in the Process of Explosive Welding

Kučera

Anastacio

Nesvadba

et al. 2018

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

“…Streak or high-speed cameras can be used to measure the wall position with time, from which the expansion is normally derived by an analysis of the recordings [22,23]. Alternatively the test can be instrumented with diagnostic techniques able to measure the wall velocity, such as the above mentioned contact pins or interferometric techniques including PDV [23][24][25]. The latter outperform the other techniques in temporal resolution, which is important especially in the early stages of the expansion where shock reverberations play a major role.…”

mentioning

confidence: 99%

Detonation Parameters of PlSEM Plastic Explosive

Anastacio

Šelešovský

Künzel

et al. 2019

Cent. Eur. J. Energ. Mater.

View full text Add to dashboard Cite

PlSEM is a plastic explosive based on RDX, PETN and a nonexplosive binder, and is used in linear shaped charges for demolition purposes. Its experimentally obtained detonation parameters are presented in the present paper. The detonation velocity was measured for cylindrical charges of various diameters, with and without confinement. The detonation pressure and particle velocity were determined using an impedance window matching technique, and cylinder tests were used to obtain the parameters of the JWL equation of state of the detonation products. Detonation velocities from 7.75 to 8.05 km·s -1 were obtained for unconfined charges with diameters from 4 to 8 mm, and from 8.15 to 8.24 km·s -1 for charges with 25 mm diameter. The experimentally determined detonation pressure was found to be 24.6 GPa.

show abstract

Improving the Design and Evaluation of PDV‐Based Cylinder Test Experiments for JWL‐Parameter Determination

Baust

2020

Propellants Explo Pyrotec

View full text Add to dashboard Cite

The cylinder test experiment is an excellent method to derive Jones‐Wilkins‐Lee‐parameters as the expansion work of the detonation products can be determined from the experimentally observed wall velocity by an analytic approach. However, the physical description of the problem is essential for a precise determination of the expansion work. A useful method to develop and validate such models is to perform hydrodynamic simulations. This work aims to provide an improved analytic model and to introduce a robust and accurate solver design to calculate JWL‐parameters in combination with an optimization of the experimental setup. An extended version of an already accurate literature model is presented, where the air gap is taken into account within the balance equations. Moreover, the surface angle of the cylinder wall is determined from geometric considerations instead of preliminary simulations for conventional explosives. Besides, an own empiric approach for the strain model is introduced, which leads to a smaller deviation between the expansion work from the cylinder test simulation and the calculated expansion work for the underlying equation of state. Regarding the derivation of JWL‐parameters and the determination of the Chapman‐Jouguet‐pressure, the complete workflow, including the global numerical optimization method, is described in detail and the accuracy and robustness of the solver are proven. The entire workflow is validated for different (full‐wall) geometries and conventional explosives to verify that the method scales. Finally, geometric considerations for the placement of the PDV‐gauges are provided to optimize the design and geometry of cylinder test experiments.

show abstract

The detonation cylinder test: Determination of full wall velocity and shape from a single velocimetry probe with an arbitrary angle

Abstract: Abstract. Laser velocimetry probes are used for measuring wall velocity in cylinder test expansion experiments. Previously, a method was developed to determine the full wall velocity, angle and case shape from a single probe aligned with the initial cylinder wall normal (S

Cited by 8 publications

References 6 publications

Experimental Determination of Acceleration of Explosively Driven Metal by Photonic Doppler Velocimetry in the Process of Explosive Welding

Experimental Determination of Acceleration of Explosively Driven Metal by Photonic Doppler Velocimetry in the Process of Explosive Welding

Detonation Parameters of PlSEM Plastic Explosive

Improving the Design and Evaluation of PDV‐Based Cylinder Test Experiments for JWL‐Parameter Determination

Contact Info

Product

Resources

About