The performance of a short-barrelled gas gun

Porat, Y; Gvishi, M

doi:10.1088/0022-3735/13/5/009

Cited by 25 publications

(3 citation statements)

References 4 publications

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“…where is the volume of the pressurized area at any given moment and 0 is the initial volume of the pressure reservoir. Inserting (2), (3), and (4) in (1) it is possible to calculate the projectile velocity and displacement by iteration in short intervals [20][21][22].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Numerical Evaluation of a Light-Gas Gun Facility for Impact Test

Rahner

Al-Qureshi

Stainer³

et al. 2014

Modelling and Simulation in Engineering

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Experimental tests which match the application conditions might be used to properly evaluate materials for specific applications. High velocity impacts can be simulated using light-gas gun facilities, which come in different types and complexities. In this work different setups for a one-stage light-gas gun facility have been numerically analyzed in order to evaluate their suitability for testing materials and composites used as armor protection. A maximal barrel length of 6 m and a maximal reservoir pressure of a standard industrial gas bottle (20 MPa) were chosen as limitations. The numerical predictions show that it is not possible to accelerate the projectile directly to the desired velocity with nitrogen, helium, or hydrogen as propellant gas. When using a sabot corresponding to a higher bore diameter, the necessary velocity is achievable with helium and hydrogen gases.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Numerical Evaluation of a Light-Gas Gun Facility for Impact Test

Rahner

Al-Qureshi

Stainer³

et al. 2014

Modelling and Simulation in Engineering

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“…Planar impact experiments were carried out in our 64 mm gas gun described by Porat and Gvishi (1980). These experiments covered the low stress region (up to about 1.5 GPa) and two more experiments (above 3.0 GPa) were conducted with the 63.5 mm powder gun described by Rosenberg et a1 (1980).…”

Section: Experimental Techniquesmentioning

confidence: 99%

Measurement of residual strains and uniaxial tension states of shock-loaded polymethylmethacrylate with the longitudinal strain-gauge technique

Rosenberg¹,

Partom²

1983

J. Phys. D: Appl. Phys.

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The authors present a series of planar shock-wave experiments in which the longitudinal strain-gauge technique is extended to measure residual strains and tension strains in shocked polymethylmethacrylate (PMMA). They also show that the residual strains can be simply related to residual temperatures which prevail in the specimen after complete release, through the thermal expansion coefficient. Uniaxial tension can be created if two rarefactions interact and they use the impedance mismatch of the copper impactors and PMMA to cause controlled tensions in it. They also obtained the maximum tensile strain in the uniaxial configuration which PMMA withstands, from which we get a value of 0.18+or-0.02 GPa for the spall strength of this material.

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“…На рис. 1 показана зависимость максимально достижимых скоростей в известных экспериментах на одноступенчатых газовых пушках по результатам анализа источников [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] от отношения давления в камере p 0 к коэффициенту массы снаряда c q = m/d 3 , традиционно измеряемому в g/cm 3 . С точки зрения расчета режимов, а также конструирования газовых лабораторных установок, важнейшим вопросом является адекватное моделирование физических процессов, позволяющее предсказывать результаты эксперимента с высокой степенью точности.…”

Section: Introductionunclassified

Влияние Уширения Газового Ресивера На Баллистические Характеристики Одноступенчатых Установок На Сжатом Газе

Быков¹,

Шестаков²

2020

Журнал Технической Физики

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The effect of the broadening of the gas reservoir on the exit velocity of the projectile during acceleration in the barrel by compressed gas is investigated. The simulation was carried out in the framework of quasi-one-dimensional and two-dimensional axisymmetric gas-dynamic models. Models are validated on experimental results. It is shown that the use of a wider reservoir with the same volume and initial pressure can increase efficiency by 25%. The significant effect of air compression in front of a light projectile under supersonic conditions on its speed is demonstrated. Accounting for air compression in front of the projectile was carried out using an approximate formula, which showed good results compared to the two-dimensional model. The effect of accelerating a light projectile due to the expulsion of an air column through the muzzle has been revealed.

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The performance of a short-barrelled gas gun

Cited by 25 publications

References 4 publications

Numerical Evaluation of a Light-Gas Gun Facility for Impact Test

Numerical Evaluation of a Light-Gas Gun Facility for Impact Test

Measurement of residual strains and uniaxial tension states of shock-loaded polymethylmethacrylate with the longitudinal strain-gauge technique

Влияние Уширения Газового Ресивера На Баллистические Характеристики Одноступенчатых Установок На Сжатом Газе

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