|

Effect of Filling Compressibility on the Variables of State During Projectile Penetration into a Concrete Target

Authors: Fedorov S.V., Veldanov V.A., Perfil’ev A.Yu., Smirnov A.S.  Published: 14.09.2017
Published in issue: #5(116)/2017  

DOI: 10.18698/0236-3941-2017-5-28-40

 
Category: Mechanics | Chapter: Mechanics of Deformable Solid Body  
Keywords: concrete target, g-force, projectile filling, dynamic compressibility, numerical simulation, penetration

The article presents the results of a numerical analysis investigating how the compressibility of a 126 mm diameter projectile affects its loading parameters in response to the g-force the projectile is subjected to as it penetrates a concrete target at an initial velocity of 1000 m/s. We performed our numerical simulation in the framework of a two-dimensional axisymmetric continuum mechanics problem, representing the filling as a compressible elastoplastic medium. We investigated three alternative filling models that have the same density under normal conditions but considerably different compressibility properties, which we describe using a barotropic Tait equation. The state variables we determined included longitudinal stresses in various regions of the filling, its rear surface velocity and axial displacement. We found that as the projectile decelerates in the concrete target, the fluctuations in these parameters are of the nature of damped oscillations, the amplitude-by-time characteristics of which depend substantially on the filling compressibility

References

[1] Selivanov V.V., ed. Sredstva porazheniya i boepripasy [Weapons and ammunition]. Moscow, Bauman MSTU Publ., 2008. 984 p.

[2] Ben-Dor G., Dubinsky A., Elperin T. Analytical engineering models for predicting high speed penetration of hard projectiles into concrete shields: A review. International Journal of Damage Mechanics, 2015, vol. 24, no. 1, pp. 76–94. DOI: 10.1177/1056789514521647 Available at: http://journals.sagepub.com/doi/10.1177/1056789514521647

[3] Veldanov V.A., Markov V.A., Pusev V.I., Ruchko A.M., Sotskiy M.Yu., Fedorov S.V. Computation of nondeformable striker penetration into low-strength obstacles using piezoelectric accelerometry data. Technical Physics, 2011, vol. 56, no. 7, pp. 992–1002. DOI: 10.1134/S1063784211070231 Available at: https://link.springer.com/article/10.1134/S1063784211070231

[4] Fedorov S.V., Fedorova N.A. Influence of the soil and rocky target strength properties on projectiles penetration depth with additional action of the jet thrust impulse. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2016, no. 4, pp. 40–56 (in Russ.). DOI: 10.18698/0236-3941-2016-4-40-56

[5] Fedorov S.V., Fedorova N.A., Veldanov V.A. Using jet propulsion burn to increase research module penetration distance into low-strength ground obstacles. Izvestiya RARAN, 2014, no. 4, pp. 53–63 (in Russ.).

[6] Babkin A.V., Kolpakov V.I., Okhitin V.N., Selivanov V.V. Prikladnaya mekhanika sploshnykh sred: V 3 t. T. 3. Chislennye metody v zadachakh fiziki bystroprotekayushchikh protsessov. Moscow, Bauman MSTU Publ., 2006. 520 p.

[7] Oran E.S., Boris J.P. Numerical simulation of reactive flow. Elsevier, 1987. 601 p.

[8] Fedorov S.V. On cut-off possibility of high-speed metal jet precursor region in process of shaped charge explosion in axial magnetic field. Boepripasy i vysokoenergeticheskie kondensirovannye sistemy, 2008, no. S2, pp. 73–80 (in Russ.).

[9] Fedorov S.V., Veldanov V.A., Smirnov V.E. Influence numerical analysis of velocity and strength of high density alloy elongated projectiles on their penetration depth into the steel target. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2015, no. 1, pp. 65–83 (in Russ.). DOI: 10.18698/0236-3941-2015-1-65-83

[10] Wilkins M.L. Calculation of elastic-plastic flow. In: Fundamental methods in hydrodynamics. Vol. 3. New York, London, Academic Press, 1964. 386 p.

[11] Fedorov S.V., Bayanova Ya.M., Ladov S.V. Numerical analysis of the effect of the geometric parameters of a combined shaped-charge liner on the mass and velocity of explosively formed compact elements. Combustion, Explosion, and Shock Waves, 2015, vol. 51, no. 1, pp. 130–142. DOI: 10.1134/S0010508215010141 Available at: https://link.springer.com/article/10.1134/S0010508215010141

[12] Fedorov S.V., Veldanov V.A. Determination of the dimension of a cavity in water behind a fast-moving cylindrical body. Technical Physics, 2013, vol. 58, no. 2, pp. 165–169. DOI: 10.1134/S1063784213020072 Available at: https://link.springer.com/article/10.1134/S1063784213020072

[13] Fedorov S.V., Veldanov V.A. Application of segmented strikers for cavern forming in ground-rock obstacles. Izvestiya RARAN, 2012, no. 1, pp. 43−50 (in Russ.).

[14] Zhernokletov M.V., ed. Metody issledovaniya svoystv materialov pri intensivnykh dinamicheskikh nagruzkakh [Methods of material properties research under intense dynamic loads]. Sarov, RFYaTs-VNIIEF Publ., 2005. 428 p.

[15] Novikov S.A., red. Vzryvchatye veshchestva. T. 1. Povedenie tverdykh vzryvchatykh veshchestv pri mekhanicheskikh nagruzkakh [Explosives. Vol. 1. Solid explosives behavior under mechanical loads]. Sarov, RFYaTs-VNIIEF Publ., 2001. 415 p.

[16] Orlenko L.P., ed. Fizika vzryva. V 2 t. T. 1 [Explosion physics. In 2 vols. Vol. 1]. Moscow, Fizmatlit Publ., 2004. 832 p.

[17] Fedorov S.V., Bayanova Ya.M. Penetration of long strikers under hydrodynamic conditions with allowance for the material compressibility. Technical Physics, 2011, vol. 56, no. 9, pp. 1266–1271. DOI: 10.1134/S1063784211090088 Available at: https://link.springer.com/article/10.1134/S1063784211090088

[18] Forrestal M.J., Frew D.J., Hickerson J.P., Rohwer T.A. Penetration of concrete targets with deceleration-time measurements. International Journal of Impact Engineering. 2003, vol. 28, no. 5, pp. 479–497. DOI: 10.1016/S0734-743X(02)00108-2 Available at: http://www.sciencedirect.com/science/article/pii/S0734743X02001082

[19] Veldanov V.A., Daurskikh A.Yu., Dudik D.E., Isaev A.L., Sotskiy M.Yu., Fedorov S.V. Experimental and theoretical research of concrete and concrete construction mechanical properties impact on their deformation character under penetration of speed-up striker. Izvestiya vysshikh uchebnykh zavedeniy. Fizika, 2013, vol. 56, no. 7–3, pp. 26−28 (in Russ.).

[20] Teland J.A., Sjol H. Penetration into concrete by truncated projectiles. International Journal of Impact Engineering, 2004, vol. 30, no. 4, pp. 447–464. DOI: 10.1016/S0734-743X(03)00073-3 Available at: http://www.sciencedirect.com/science/article/pii/S0734743X03000733