Analysis of perforation process into concrete/metal targets by rigid projectiles

Khazraiyan, Najmeh; Liaghat, Gholamhossein; Khodarahmi, Hossein; Dashtian-Gerami, Nasser

doi:10.1177/0954406212462198

Cited by 7 publications

(17 citation statements)

References 26 publications

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“…The comparisons between all obtained results are implemented in this section. Figure depicts residual velocity of the projectile versus its impact velocity by comparing with Forrestal and Chen models. It is seen that Forrestal model does not yield good matching with experimental data at low impact velocities due to its lack of consideration of conoid formation.…”

Section: Resultsmentioning

confidence: 99%

“…The creation of this conoid depends on several parameters. One of the main parameter is impact initial velocity …”

Section: Analytical Modelmentioning

confidence: 99%

“…It is assumed that the time required for reflection of the compressive waves and crack is:

t_{2} = \frac{H}{u_{long}} + \frac{H}{v_{crack}},

where u long is the speed of longitudinal stress waves, v crack is the speed of radial crack propagation and H is the target thickness. It is assumed that the relation between v crack and u long is given by

v_{crack} = \frac{1}{9.5} u_{long}

, where is taken from the comparison with the results of performed tests in next section.…”

Section: Analytical Modelmentioning

confidence: 99%

“…In the above equation, m is the projectile mass , V is instantaneous velocity of projectile , d is projectile diameter , f c is the compressive strength of the concrete material, ρ c is concrete density, s is the experimental constant depending on compressive strength of concrete target. N 1 and N 2 are parameters that depend on the friction coefficient μ and nose shape which are obtained for hemispherical projectiles as:

N_{1} = 1 + \frac{μπ}{2}, N_{2} = \frac{1}{2} + \frac{μπ}{8}, N^{*} = \frac{1}{2} .

…”

Section: Analytical Modelmentioning

confidence: 99%

“…Ben‐Dor et al obtained the perforation limit for the flat‐nosed projectile, which matches the experimental results of the concrete target in the damage mode. Khazraiyan et al proposed a semi‐analytical model for penetration of ogival and hemispherical rigid projectile into finite target. The results for the ogival rigid projectiles match the accessible experimental results …”

Section: Introductionmentioning

confidence: 99%

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Evaluation of semi‐analytical model for rigid projectile penetration into concrete/metal targets

Gerami

Khazraiyan

2019

Structural Concrete

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The main objective of this research is to evaluate a proposed semi‐analytical model for penetration process of rigid projectile in concrete and concrete/metal targets using experimental and numerical methods. In theoretical analysis of this study, the dynamics cavity expansion theory and the wave reflection time in the form of tensile in concrete slab are used. The effect of the friction coefficient is also investigated during the penetration process. The equations are then generalized for two‐layered targets made out of concrete and steel. A series of penetration tests and numerical simulations in LS‐DYNA software are conducted to evaluate the proposed model. The main obtained parameters are residual velocity, penetration depth, and ballistic limit velocity. The analytical results are compared with experimental and numerical data. These results are in agreement with each other.

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Section: Resultsmentioning

confidence: 99%

“…The creation of this conoid depends on several parameters. One of the main parameter is impact initial velocity …”

Section: Analytical Modelmentioning

confidence: 99%

“…It is assumed that the time required for reflection of the compressive waves and crack is:

t_{2} = \frac{H}{u_{long}} + \frac{H}{v_{crack}},

v_{crack} = \frac{1}{9.5} u_{long}

, where is taken from the comparison with the results of performed tests in next section.…”

Section: Analytical Modelmentioning

confidence: 99%

N_{1} = 1 + \frac{μπ}{2}, N_{2} = \frac{1}{2} + \frac{μπ}{8}, N^{*} = \frac{1}{2} .

…”

Section: Analytical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of semi‐analytical model for rigid projectile penetration into concrete/metal targets

Gerami

Khazraiyan

2019

Structural Concrete

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Analysis of liner effect on shaped charge penetration into thick concrete targets

Gerami

Liaghat

Moghadas

et al. 2017

J Braz. Soc. Mech. Sci. Eng.

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A e Specific constant in explosive material A h Material constant in Johnson-Holmquist material model a Volumetric modification coefficient B Material constant in Johnson-Cook material model B e Specific constant in explosive material B h Material constant in Johnson-Holmquist material model C Material constant in Johnson-Cook material model C h Material constant in Johnson-Holmquist material model C v Volumetric speed of sound or the intercept of the U S − U P curve D Damage parameter D 1 , D 2 Damage constant in Johnson-Holmquist model d 1 , d 2 , d 3 , d 4 , d 5 Material constants in Johnson-Cook material model E Internal energy f c Unconfined compressive strength of concrete F Fraction burn parameter K 1 , K 2 , K 3 Pressure constant in Johnson-Holmquist material model M Material constant in Johnson-Cook material model N Material constant in Johnson-Cook material model N h Material constant in Johnson-Holmquist material model P Applied pressure P eos Pressure of the equation of state P * Normalized pressure

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Analytical modeling of the high-velocity impact of autoclaved aerated concrete (AAC) blocks and some experimental results

Bayat

Liaghat

Ghalami-Choobar

et al. 2019

International Journal of Mechanical Sciences

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Highlight  High velocity impact behavior of Autoclaved aerated concrete (AAC) was studied.  An analytical model was presented to predict the residual velocity of projectile.  Four energy absorption mechanism considered to predict impact behavior accurately.  The model validated by comparison of model results with those of experiments.  The validated model was employed for parametric study and sensitivity analysis.

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Analysis of perforation process into concrete/metal targets by rigid projectiles

Cited by 7 publications

References 26 publications

Evaluation of semi‐analytical model for rigid projectile penetration into concrete/metal targets

Evaluation of semi‐analytical model for rigid projectile penetration into concrete/metal targets

Analysis of liner effect on shaped charge penetration into thick concrete targets

Analytical modeling of the high-velocity impact of autoclaved aerated concrete (AAC) blocks and some experimental results

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