In the near field, the air blast peak overpressure from cylindrical charges may vary by several times with angles at the same scaled distance. We propose an estimation equation for the peak overpressure from cylindrical charges, which can predict the peak overpressure from cylindrical charges at any positions in the near field. The estimation equation is in the form of piecewise function which contains three variables of length-to-diameter ratio, angle and scaled distance, and the applicability of our estimation equation is verified by experiment and simulation. After preliminary verification, the application range of length-to-diameter ratio of cylindrical charge is and that of scaled distance is . The estimation equation can be rapidly applied to the assessment of near-field target damage and protection against air blast from cylindrical charges, which is a significant supplement to the traditional empirical equations for spherical charge.
AnasSMAlamMUmairM (2022) Air-blast and ground shockwave parameters, shallow underground blasting, on the ground and buried shallow underground blast-resistant shelters: a review. International Journal of Protective Structures13(1): 99–139.
2.
AnastacioACKnockC (2016) Radial blast prediction for high explosive cylinders initiated at both ends. Propellants, Explosives, Pyrotechnics41(4): 682–687.
3.
SilAPhukanD (2019) Quantification and analysis of air blast load propagation characteristics on structures. Journal of Building Pathology and Rehabilitation4(1): 24.
4.
Artero-GuerreroJPernas-SánchezJTeixeira-DiasF (2017) Blast wave dynamics: the influence of the shape of the explosive. Journal of Hazardous Materials331: 189–199.
5.
BrodeHL (1955) Numerical solutions of spherical blast waves. Journal of Applied Physics26(6): 766–775.
6.
ChiquitoMCastedoRLopezLM, et al. (2019) Blast wave characteristics and TNT equivalent of improvised explosive device at small-scaled distances. Defence Science Journal69(4): 328–335.
7.
Langran-WheelerCRigbySEClarkeSD, et al. (2021) Near-field spatial and temporal blast pressure distributions from non-spherical charges: horizontally-aligned cylinders. International Journal of Protective Structures12(4): 492–516.
8.
ClutterJKKingKW (2016) Effect of charge shape on blast containment chamber survivability. International Journal of Protective Structures7(3): 389–408.
9.
DonahueLauraK (2009) Afterburning of TNT Detonation Products in Air. Canada: Dalhousie University.
10.
DonahueLZhangFRipleyRC (2013) Numerical models for afterburning of TNT detonation products in air. Shock Waves23(6): 559–573.
11.
EsparzaED (1992) Spherical Equivalency of Cylindrical Charges in Free-Air. CA, USA: 25th Department of defense explosives safety seminar Anaheim.
12.
GaoCKongXFangQ, et al. (2022) Numerical investigation on free air blast loads generated from center-initiated cylindrical charges with varied aspect ratio in arbitrary orientation. Defence Technology18(9): 1662–1678.
13.
GoelDMMatsagarVA (2014) Blast-resistant design of structures, practice periodical on structural design and construction. ASCE19(2): 1–12.
14.
HenrychJ (1979) The Dynamics of Explosion and its Use. New York: Elsevier Scientific Publishing Company.
15.
KatselisGAndersonJG (2001) Estimation of Blast Overpressure from a Cylindrical Charge Using Time of Arrival Sensors. Adelaide, Australia: 14th Australasian Fluid Mechanics Conference Adelaide University.
16.
KingeryCNCoulterGA (1982) TNT Equivalency of Pentolite Hemispheres. Ballistic Research Laboratory, Maryland, Technical Report DTIC ADA123340. https://doi.org/10.21236/ada123340
17.
KinneyGFGrahamKJ (1985) Explosive Shocks in Air. Berlin and New York: Springer-Verlag.
18.
KnockCDaviesN (2011) Predicting the peak pressure from the curved surface of detonating cylindrical charges. Propellants, Explosives, Pyrotechnics36: 203–209.
19.
KnockCDaviesN (2013) Blast waves from cylindrical charges. Shock Waves23(4): 337–343.
20.
KnockCDaviesNReevesT (2015) Predicting blast waves from the axial direction of a cylindrical charge. Propellants, Explosives, Pyrotechnics40(2): 169–179.
21.
LeeEFingerMCollinsW (1973) JWL Equation of State Coefficients for High Explosives. United States: Technical Report UCID-16189 Lawrence Livermore Laboratory.
PloosterMN (1978) Blast Front Pressures from Cylindrical Charges of High Explosives. China Lake, CA: Technical Report NWC-TM-3631 Denver Research Institute, Naval Weapons Center.
24.
PloosterMN (1982) Blast Effects from Cylindrical Explosive Charges: Experimental Measurements. China Lake, CA: Technical Report NWC TP6382 Denver Research Institute, Naval Weapons Center.
25.
SherkarPShinJWhittakerA, et al. (2016) Influence of charge shape and point of detonation on blast-resistant design. Journal of Structural Engineering142(2): 04015109.
26.
ShiYCWangNCuiJ, et al. (2022) Experimental and numerical investigation of charge shape effect on blast load induced by near-field explosions. Process Safety and Environmental Protection165: 266–277.
27.
SimoensBLefebvreM (2015) Influence of the shape of an explosive charge: quantification of the modification of the pressure field. Central European Journal of Energetic Materials12(2): 195–213.
28.
SwisdakMM (2010) Airblast Equivalent Weights of Various Explosive Charge Shapes for Testing Structures. VA: Department of Defense Explosives Safety Board Alexandria.
29.
WangFLiuJHeAM, et al. (2020) Ejecta production from metal Sn into inert gases. Journal of Applied Physics127(19): 195901.
30.
WuCQFattoriGWhittakerA, et al. (2010) Investigation of air-blast effects from spherical- and cylindrical-shaped charges. International Journal of Protective Structures1(3): 345–362.
31.
XiaoWFAndraeMGebbekenN (2020a) Effect of charge shape and initiation configuration of explosive cylinders detonating in free air on blast-resistant design. Journal of Structural Engineering146(8): 04020146.
32.
XiaoWFAndraeMGebbekenN (2020b) Influence of charge shape and point of detonation of high explosive cylinders detonated on ground surface on blast-resistant design. International Journal of Mechanical Sciences181: 105697.
33.
ZakrissonBWikmanBHaggbladHA (2011) Numerical simulations of blast loads and structural deformation from near-field explosions in air. International Journal of Impact Engineering38(7): 597–612.
34.
ZhaoXHWangGFangH, et al. (2021) Shock wave propagation characteristics of cylindrical charge and its aspect ratio effects on the damage of rc slabs. Advances in Materials Science and Engineering2021: 1–20.
