Thermo-mechanically coupled thermal and stress analysis of interior ballistics problem

Şentürk, Abdullah; Işık, Halil; Evci, Celal

doi:10.1016/j.ijthermalsci.2015.12.019

Cited by 34 publications

(14 citation statements)

References 10 publications

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“…Cardew and Cardew [21] state it is within the first five inches of an air rifle barrel where all energy is imparted into the pellet and only after 25 inches the pellet will begin to slow down. Optimum barrel length is the trade-off between friction and the loss of gas pressure; if the barrel is too long, more energy is wasted overcoming contact friction between the projectile and barrel, but if too short, more gas pressure is wasted as it has not had the opportunity to accelerate the projectile [21,28]. According to Denny [26], a pre-charged .177 calibre air rifle is theoretically only 15 % efficient, and .22 calibre only 24 %, demonstrating the extent of energy wastage caused by friction and barrel length for example, in low energy guns.…”

Section: Barrel Lengthmentioning

confidence: 99%

Empirical evaluation of spring powered air rifle storage and modifications on forensic practice and casework

Greenslade

Bolton-King

2019

Forensic Science International

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Air weapons are commonly used by civilian populations across the world, particularly by those under 18, and discharges often result in desecration, criminal damage and animal abuse. Online forums and websites provide an accessible resource for civilians to access airgun modification methods proposing to increase muzzle velocity. However, there is limited published research that empirically evaluates the impact of air weapon modification and the potential to influence casework interpretation. Therefore, this paper aims to initiate such research by quantifying the effect of storage conditions (mainspring compression and oil travel/dieseling) and two modifications (reduction of barrel length and preloading through addition of washers) encountered in casework on recorded muzzle velocities using a small number of break barrel, spring powered air rifles.

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Section: Barrel Lengthmentioning

confidence: 99%

Empirical evaluation of spring powered air rifle storage and modifications on forensic practice and casework

Greenslade

Bolton-King

2019

Forensic Science International

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“…Bougamra et al [3] predicted the muzzle velocity of the projectile, and the pressure history in the system during the firing process using one-dimensional, single phase, "lumped-parameter" models and multidimensional multiphase flow model. Şentürk et al [4] investigated the interior ballistics problem using experimental, numerical and analytical methods with a thermo-mechanical approach. They employed the Valliere Heydenreich method to determine the transient pressure distribution along the barrel and the Noble-Abel equation to calculate the gas temperature.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermal and gas-dynamic characteristics of different types of propellant in small weapons

Boukera¹,

Hristov²,

Ziane³

et al. 2021

Therm sci

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This paper presents a numerical and an analytical approach for calculation of internal ballistics parameters through determination of thermal and gas- dynamic characteristics. The calculated parameters are validated through experimental tests on a real weapon system. The internal ballistic calculations are provided for two types of propellants using an analytical and a numerical model. Calculations and tests are performed for an anti-material rifle 12.7 mm. Weapon and ammunition testing is carried out according to the C.I.P. (Permanent International Commission) standard. Theoretical and experimental results for the gunpowder gases pressure and the muzzle velocity are compared. The good agreements between the calculated and the measured pressures and velocities increase the reliability of the estimated gunpowder gas temperatures in the barrel. The obtained results enable analysis and comparison of the output internal ballistics parameters for different types of propellant applications.

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“…The conclusions are confirmed by the analysis of the test results with the use of energy parameters of fatigue. In summary, there are very limited studies on the LCF behavior of Cr-Mo-V steel at 700 • C. Moreover, the literature [8,9] reported that the inner bore surface temperature of the gun barrel can reach approximately 600-700 • C when the gun was shooting. Therefore, it is necessary to study the fatigue performance of gun steels at 700 • C.…”

Section: Introductionmentioning

confidence: 99%

Low-Cycle Fatigue Behavior of the Novel Steel and 30SiMn2MoV Steel at 700 °C

Zhao

Zhang

et al. 2020

Materials

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As a newly developed gun barrel steel, the novel steel has shown excellent high-temperature strength, high resistance to wear and erosion, contributing to the superior ballistic life of gun barrels. As ballistic life increases, the fatigue life becomes essential for the safety and reliability of gun barrels. This paper presents a comparison of the low cycle fatigue (LCF) behaviors between a novel steel and 30SiMn2MoV steel at 700 °C. A strain-controlled fatigue test was carried out on the novel steel and 30SiMn2MoV steel in the strain range from 0.2 to 0.6%. The cyclic stress response behaviors of the novel steel and 30SiMn2MoV steel show cyclic softening behavior. In addition, the shape of the hysteresis rings of the novel steel and 30SiMn2MoV steel exhibit no-Masing model behavior. Energy–life relationships results show that the novel steel has higher fatigue resistance than the 30SiMn2MoV steel at 700 °C. The results of fatigue fracture analysis show that the failure mode of the 30SiMn2MoV steel is a mixed mode of intergranular fracture and transgranular fracture, while the failure mode of the novel steel is intergranular fracture. The cyclic softening of the two materials can be attributed to the lath structure with a high density of dislocations gradually transforms into low energy subcrystalline and cellular structures at 700 °C. The novel steel has a better fatigue life than the 30SiMn2MoV steel at 700 °C and different strain amplitudes, which is mainly related to the carbides and lath martensite in the materials.

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Thermo-mechanically coupled thermal and stress analysis of interior ballistics problem

Cited by 34 publications

References 10 publications

Empirical evaluation of spring powered air rifle storage and modifications on forensic practice and casework

Empirical evaluation of spring powered air rifle storage and modifications on forensic practice and casework

Analysis of thermal and gas-dynamic characteristics of different types of propellant in small weapons

Low-Cycle Fatigue Behavior of the Novel Steel and 30SiMn2MoV Steel at 700 °C

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