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High-velocity impact loading in honeycomb sandwich panels reinforced with polymer foam: a numerical approach study

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Abstract

The employment of lightweight structures is one of the most important goals in various industries. The lightweight sandwich panel is an excellent energy absorber and also a perfect way for decreasing the risk of impact. In this paper, a numerical study of high-velocity impact on honeycomb sandwich panels reinforced with polymer foam was performed. The results of numerical simulation are compared with the experimental findings. The numerical modeling of high-velocity penetration process was carried out using nonlinear explicit finite-element code, LS-DYNA. The aluminum honeycomb structure, unfilled honeycomb sandwich panel, and the sandwich panels filled with three types of polyurethane foam (foam 1: 56.94, foam 2: 108.65, and foam 3: 137.13 kg/m3) were investigated to demonstrate damage modes, ballistic limit velocity, absorbed energy, and specific energy absorption (SEA) capacity. The numerical ballistic limit velocity of sandwich panels, filled with three types of foam, was more than that of a bare honeycomb core and unfilled sandwich panel. In addition, the numerical results showed that the sandwich panel filled with the highest density foam could increase the strength of sandwich panel and the numerical specific energy absorption of this structure was 23% more than that of unfilled. Finally, the numerical results were in good agreement with experimental findings.

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Abbreviations

C:

Cowper–Symonds strain rate parameter

E :

Elastic modulus

M :

Mass of projectile

m :

Mass of material expelled from the target

n :

Number of observations

P :

Cowper–Symonds strain rate parameter

s :

Estimated standard deviation

t :

Time

\(v_{\text{bn}}\) :

Numerical ballistic limit velocity

\(v_{\text{out}}\) :

Output velocity

\(v_{\text{in}}\) :

Input velocity

\(v_{\text{be}}\) :

Experimental ballistic limit velocity

\(v_{\hbox{max} }\) :

Maximum velocity

\(v_{\hbox{min} }\) :

Minimum velocity

X :

Value of a single observation

E c :

Compressive modulus of the foam

E p :

Plastic hardening modulus

\(E_{\tan }\) :

Tangent modulus

SEA:

Specific energy absorption

\(\dot{\varepsilon }\) :

Strain rate

ε d :

Densification strain

ε u :

Failure strain

\(\varepsilon_{\text{p}}^{\text{eff}}\) :

Effective plastic strain

ν :

Poisson ratio

ρ :

Density

α :

Coefficient

\(\beta\) :

Hardening parameter

σ 0 :

Initial yield stress

σ c :

Compressive stress of the foam

σ d :

Densification stress

σ u :

Ultimate tensile strength

σ y :

Yield strength

τ u :

Ultimate shear strength

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

    Fatemeh Hassanpour Roudbeneh & Gholamhossein Liaghat

  2. School of Engineering, Kingston University, London, SW15 3DW, UK

    Gholamhossein Liaghat & Homayoun Hadavinia

  3. Department of Mechanical Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran

    Hadi Sabouri

Authors
  1. Fatemeh Hassanpour Roudbeneh
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  2. Gholamhossein Liaghat
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  3. Hadi Sabouri
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  4. Homayoun Hadavinia
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Correspondence to Gholamhossein Liaghat.

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Hassanpour Roudbeneh, F., Liaghat, G., Sabouri, H. et al. High-velocity impact loading in honeycomb sandwich panels reinforced with polymer foam: a numerical approach study. Iran Polym J 29, 707–721 (2020). https://doi.org/10.1007/s13726-020-00833-5

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  • DOI: https://doi.org/10.1007/s13726-020-00833-5

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