Failure behavior of concrete subjected to high dynamic loading of new spiral projectile

Wu, Jun; Jianguo, Ning; Ma, Tianbao

doi:10.14429/dsj.68.11349

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…The present research is attempted to design the new projectile nose shape so that the spinning can play the important role during the penetration of target effectively. Wu et al (2018) has proposed a new spiral projectile concept. However, present research is focused on all together a new spiral head projectile by modifying the well-established ogive nose projectile shown in Figure 1.…”

Section: Concept Of Spiral Head Projectilesmentioning

confidence: 99%

Design and development of new spiral head projectiles undergoing ballistics impact

Pranay

Panigrahi

2022

IJSI

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PurposeThe purpose of this study is to design and develop new spiral head projectiles undergoing ballistics impact.Design/methodology/approachThe introduction of the rifled barrel in firearms made projectile spin during its flight path. The central translational velocity (impact velocity) is one parameter to defeat/penetrate the target in the penetration process. Another important parameter considered to be the shape of the projectile. Many types of projectile shapes have been designed to defeat the target. In the recent years, ogival nose shape is one of the well-known projectile shapes in use abundantly. The present research is made to design the nose shape so as to use the spin during the penetration of target effectively. In this study, a new spiral head projectile shape is proposed and designed, which uses the rotation of projectile (spin) for penetrating the Al7075-T6 target. When the ogive and new spiral head projectile is impacted on Al 7075-T6 target of 12.5 mm, 18 mm thicknesses at ordnance velocities, the residual velocity is evaluated numerically using ANSYS/Explicit Dynamics at normal impact condition. Two projectile materials, steel 4340 and tungsten alloy, are used as projectile materials. Along with the translational velocity, rotation velocities (spin rate) 13,000, 26,000 and 52,000 rad/s also provided to projectile. The residual velocities verses spin rate are plotted for different spiral angle projectiles for impact velocities 1,000–1,500 m/s, at normal impact conditions on the Al 7075-T6 target. Compared with the ogive nose projectile, the proposed new spiral head projectile made of tungsten alloy is significantly effective.FindingsSpiral head projectile having tungsten alloy material gives encouraging results at 12.5 mm target thickness. The new spiral head projectile is damaged partially. At 18 mm target thickness impact conditions, it is observed that the projectile head is completely damaged. The effectiveness of spiral head projectile on a target plate thickness of 18 mm is considered to study the impact condition.Research limitations/implicationsAll the above results need to be experimentally verified. However, the basic numerical model used in the present study, i.e. the basic ogive nose numerical model with only translational energy, is well validated with penetration theory available in literatures.Practical implicationsThe designed new spiral head projectile is only effective with tungsten alloy material within considered design parameters. For steel 4340 material, the spiral head projectile is less effective than the ogive nose projectile. In tungsten alloy projectiles, by observing all considered spiral angles, 30-degree spiral angle projectile gives the best performance at most of the considered impact velocity conditions.Originality/valueThe proposed research outputs are original, innovative and, have lot of importance in defence applications particularly in arms and ammunitions.

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Section: Concept Of Spiral Head Projectilesmentioning

confidence: 99%

Design and development of new spiral head projectiles undergoing ballistics impact

Pranay

Panigrahi

2022

IJSI

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“…* MAT_PLASTIC_KINEMATIC model was selected for the rock for the purpose of taking into account the large strain, high strain rate, and the damage under the action of detonation load [21], combined with the * MAT_ADD_EROSION model containing the thresholds of the tensile and compressive failure to acquire the macroscopic effect of fracture [22,23]. Mudstone, sandstone, and granite were chosen as three kinds of rock with different strengths for the simulation.…”

Section: Numerical Simulation Of the Slottedmentioning

confidence: 99%

Influence of Rock Strength on the Propagation of Slotted Cartridge Blasting‐Induced Directional Cracks

Shu

Shao

Dong

et al. 2019

Advances in Civil Engineering

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Based on theories of explosive mechanics and rock fracture mechanics, the influence mechanism of rock strength on the propagation length of the primary crack in the directional fracture blasting with slotted cartridge has been investigated deeply to propose the relation equation between the rock strength and the propagation length of the primary crack. Theoretically, the maximum length am of the primary crack increases with the enhancing rock strength parameters. The explicit dynamic analysis software LS-DYNA has been used to simulate the slotted cartridge blasting in the mudstone, sandstone, and granite with different strengths in order to reveal the effect of rock strength on the propagation length and velocity of the primary crack and the stress distribution characteristics in rock. The numerical results show the primary crack easily bifurcates and attain a much shorter propagation length in the mudstone with the minimum strength, and there are radial cracks appearing in the nonslotted direction. When rock strength rises, the propagation length, velocity, and duration of the primary crack and the concentration degree of effective stress in the slotted direction will all increase in the sandstone and granite, but there is an opposite influence trend of rock strength in the stage of the initial guide crack’s formation. The cracking velocity has an overall oscillation downtrend whose swing amplitude enhances clearly with the increasing rock strength, signifying the more unsteady propagation of the primary crack in the higher strength rock.

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Effect of grooves on the double-nosed projectile penetrating into plain concrete target

Han

Zhang

Wang³

et al. 2020

International Journal of Impact Engineering

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Failure behavior of concrete subjected to high dynamic loading of new spiral projectile

Cited by 4 publications

References 16 publications

Design and development of new spiral head projectiles undergoing ballistics impact

Design and development of new spiral head projectiles undergoing ballistics impact

Influence of Rock Strength on the Propagation of Slotted Cartridge Blasting‐Induced Directional Cracks

Effect of grooves on the double-nosed projectile penetrating into plain concrete target

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