A new closed vessel for determining the ballistic performance of high energy solid and liquid gun propellants

2000 ◽  
Vol 18 (4) ◽  
pp. 311-330 ◽  
Author(s):  
S. B. Langston ◽  
S. J. McGuigan ◽  
J. M. Bellerby ◽  
M. P. B. Laird
Keyword(s):  
High Energy ◽  
Closed Vessel ◽  
Ballistic Performance ◽  
Gun Propellants

A Novel Interior Ballistic Prediction of Gun Propellants Based on Experimental Pressure-Apparent Burning Rate Model in Closed Vessel

2013 ◽  
Vol 668 ◽  
pp. 584-588
Author(s):  
Zheng Gang Xiao ◽  
San Jiu Ying ◽  
Wei Dong He ◽  
Fu Ming Xu
Keyword(s):  
Burning Rate ◽  
Relative Pressure ◽  
Rate Model ◽  
Closed Vessel ◽  
Ballistic Performance ◽  
New Model ◽  
Pressure Impulse ◽  
Form Function ◽  
Gun Propellants ◽  
Experimental Pressure

A new experimental pressure-apparent burning rate model was established based on the recorded pressure-time data in the closed vessel to study the actual burning gas generate rate of a propellant whose form function is not available. The new burning model can replace the Vieille’s law and form function of propellants in the interior ballistic equations to predict the interior ballistic performance of gun. As distinct from the traditional geometric form function based burning rate model, the new model introduced the concept of relative pressure impulse related to the actual burnt web thickness of propellant statistically. The apparent burning rate was expressed by the propellant mass fraction burnt vs. relative pressure impulse curve. The interior ballistic simulation of selected gun propellants was conducted using the new burning rate model. The results predicted by the new model show a good agreement with the classic interior ballistic predication results though the agreement with the experimental results is still to be improved.

Ballistic Performance of Zr-Based Bulk Metallic Glass/Ti Surface Composites Fabricated by High-Energy Electron-Beam Irradiation

2010 ◽  
Vol 654-656 ◽  
pp. 2700-2703
Author(s):  
Jeong Hyeon Do ◽  
Chang Woo Jeon ◽  
Duk Hyun Nam ◽  
Choong Nyun Paul Kim ◽  
Young Bum Song ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Composite Plates ◽  
High Energy ◽  
High Energy Electron ◽  
Beam Irradiation ◽  
Ballistic Performance ◽  
Surface Composite ◽  
Surface Composites ◽  
Composite Layers

This study aimed at investigating the ballistic performance of Zr-based bulk metallic glass/Ti surface composites fabricated by high-energy electron-beam irradiation. The ballistic impact test was conducted on surface composite plates to evaluate the ballistic performance. Since the surface composite layers were observed to block effectively a fast traveling projectile, while many cracks were formed in the composite layers, the surface composite plates were not perforated. The surface composite layer containing ductile β dendritic phases showed the better ballistic performance than the one without containing dendrites because dendritic phases could hinder the propagation of shear bands or cracks.

scholarly journals ESTIMATION OF BALLISTIC PARAMETERS OF GUN PROPELLANTS THROUGH CLOSED VESSEL EXPERIMENT MODELING

2005 ◽  
Vol 4 (1) ◽  
pp. 50 ◽  
Author(s):  
J. L. S. P. De Oliveira ◽  
A. A. M. F. Filho ◽  
G. M. Platt ◽  
F. C. Peixoto
Keyword(s):  
Maximum Likelihood ◽  
Burning Rate ◽  
Pressure Profile ◽  
Statistical Procedure ◽  
System Of Differential Equations ◽  
Closed Vessel ◽  
Empirical Correlations ◽  
Gun Propellants ◽  
Energy Balances ◽  
Theoretical Pressure

Closed vessels have being used for the regression of lumped ballistic parameters for decades. However, if material and energy balances are coupled with burning rate empirical correlations, several uncorrelated parameters can be estimated, which describe more accurately the thermochemical behavior of the gases generated, even if the chemical composition of the propellant is unknown (as when the propellant is aged, for instance). This research presents such approach leading to a system of differential equations which are integrated to produce a theoretical pressure profile in the vessel, highly dependent on the choice of empirical parameters. Such parameters are manipulated according to the Maximum Likelihood statistical procedure, which leads to the best set of parameters to describe the propellant.

scholarly journals On Influence of Mechanical Properties of Gun Propellants on Their Ballistic Characteristics Determined in Closed Vessel Tests

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3243
Author(s):  
Radosław Trębiński ◽  
Jacek Janiszewski ◽  
Zbigniew Leciejewski ◽  
Zbigniew Surma ◽  
Kinga Kamińska
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Point Of View ◽  
Closed Vessel ◽  
Shape Functions ◽  
Stress Strain ◽  
Static Compression ◽  
Burning Process ◽  
Double Base ◽  
Gun Propellants

The geometric burning law of gun propellants is widely used in computer codes used for the simulations of the internal ballistics of guns. However, the results of closed vessel tests prove that the burning process of some propellants deviates from the geometric law. Validation of the hypothesis that observed deviations can be attributed to the cracking of propellant grains was the aim of this work. In order to verify the hypothesis, three types of gun propellants were chosen with considerably differing mechanical strengths: a single-base propellant, a double-base propellant, and a composite propellant. The mechanical properties of the gun propellants were tested using a quasi-static compression method with strain rate values of the order of 0.001 s−1 and the Split Hopkinson Pressure Bar technique with the strain rate in the range of 1000–6000 s−1. The mechanical responses of the propellants were assessed on the basis of the true stress–strain curves obtained and from the point of view of the occurrence of cracks in the propellant grains specimens. Moreover, closed vessel tests were performed to determine experimental shape functions for the considered gun propellants. Juxtaposition of the stress‒strain curves with the experimental shape functions proved that the observed deviations from the geometrical burning law can be attributed mainly to the cracking of propellant grains. The results obtained showed that the rheological properties of propellants are important not only from the point of view of logistical issues but also for the properly controlled burning process of propellants during the shot.

scholarly journals ESTIMATION OF BALLISTIC PARAMETERS OF GUN PROPELLANTS THROUGH CLOSED VESSEL EXPERIMENT MODELING

2005 ◽  
Vol 4 (1) ◽  
Author(s):  
J. L. S. P. De Oliveira ◽  
A. A. M. F. Filho ◽  
G. M. Platt ◽  
F. C. Peixoto
Keyword(s):  
Chemical Composition ◽  
Maximum Likelihood ◽  
Pressure Profile ◽  
Statistical Procedure ◽  
System Of Differential Equations ◽  
Closed Vessel ◽  
Empirical Correlations ◽  
Gun Propellants ◽  
Energy Balances ◽  
Theoretical Pressure

Closed vessels have being used for the regression of lumped ballistic parameters for decades. However, if material and energy balances are coupled with burning rate empirical correlations, several uncorrelated parameters can be estimated, which describe more accurately the thermochemical behavior of the gases generated, even if the chemical composition of the propellant is unknown (as when the propellant is aged, for instance). This research presents such approach leading to a system of differential equations which are integrated to produce a theoretical pressure profile in the vessel, highly dependent on the choice of empirical parameters. Such parameters are manipulated according to the Maximum Likelihood statistical procedure, which leads to the best set of parameters to describe the propellant.

Closed-Vessel and Thermal Studies on Triple-Base Gun Propellants Containing CL-20

2010 ◽  
Vol 26 (1) ◽  
pp. 120-124 ◽  
Author(s):  
C. N. Divekar ◽  
R. R. Sanghavi ◽  
U. R. Nair ◽  
T. K. Chakraborthy ◽  
A. K. Sikder ◽  
...  
Keyword(s):  
Thermal Studies ◽  
Closed Vessel ◽  
Gun Propellants
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