A new formulation for predicting the perforation of ballistic impacts in concrete

Lima, Thiago Vicente; Aguilera, Letícia dos Santos; Peripolli, Suzana Bottega; Campos, Jose Brant de

doi:10.1590/s1678-86212024000100736

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Artigo • Ambient. constr. 24 • 2024 • https://doi.org/10.1590/s1678-86212024000100736 copy

A new formulation for predicting the perforation of ballistic impacts in concrete

Uma nova formulação para previsão da perfuração de impactos balísticos em concreto

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This work presents a model for determining the depth of projectile perforation based on the RBL formula for ballistic impact, validated with microconcrete specimens made with Portland cement and coarse aggregate of granite and basalt. The model was validated with 7.62 x 51 mm FMJ (Full Metal Jacketed) ammunition on specimens with 5 cm of diameter and a height variation of 5.00 - 10.00 cm The transformation of kinetic energy into heat was found to be one of the forms of energy release. Experimental results showed that the calculation model proposed here predicts penetration depth values closer to the experimental values than current models, which is favorable for the safety.

Keywords:
concrete constitutive model; Ballistic impact; Microconcrete

Compressive strength test (MPa) 28 days
Specimens	Aggregate
	Granite	Basalt
	19.86	36.87
	35.60	35.24
	25.46	37.89
Average	26.98	36.67
Standart deviation	7.98	1.34

Level	Ammunition	Mass of the Projectile (g)	V₀ (m/s)	Impact Energy (J)
III	7.62 x 51FMJ (.308 - Winchester)	9.8 ± 0.1	838 ± 15	3.406

Specimen	Initial Mass (g)	Initial Height (cm)	Velocity (m/s)	Impact Energy (J)	NP
Basalt	244.34	5.20	836.00	3424.59	PC
Basalt	254.62	5.15	829.00	3367.48	PC
Granite	236.50	5.00	842.00	3473.92	PC
Granite	230.28	5.20	838.00	3440.99	PC

Specimen	Initial Mass (g)	Final Mass (g)	Initial Height (cm)	Final Height (cm)	Velocity (m/s)	Impact Energy (J)	NP
Basalt	443.11	209.19	10.14	4.52	839.00	3449.21	PP
Basalt	448.29	213.68	10.13	4.38	837.00	3432.79	PP
Granite	443.48	221.34	9.96	5.77	833.00	3400.06	PP
Granite	443.42	218.26	9.86	5.75	835.00	3416.40	PP

Real and Calculated penetration (cm)
Specimen	Real	RLB	%	V. Lima	%
Basalt	5.62	4.31	23.39%	6.06	-7.89%
Basalt	5.75	4.29	25.36%	6.06	-5.37%
Granite	4.19	4.97	18.65%	5.19	-23.84%
Granite	4.11	4.99	21.35%	5.19	-26.35%
Basalt*	5.20	4.28	17.60%	6.06	-16.47%
Basalt*	5.15	4.24	17.72%	6.04	-17.27%
Granite*	5.00	5.04	-0.86%	5.21	-4.14%
Granite*	5.20	5.01	-3.63%	5.20	0.19%

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[1] Thiago Vicente Lima

Mechanical Engineering Department | Universidade do Estado do Rio de Janeiro | Rua Fonseca Teles, 121, São Cristovão | Rio de Janeiro - RJ - Brazil | CEP 20940-200 | Tel.: (21) 2332-4736 | E-mail: thigocivil@yahoo.com