Process for design optimization of honeycomb core sandwich panels for blast load mitigation

Nayak, S. K.; Singh, Abhendra K.; Belegundu, Ashok D.; Yen, Chian-Fong

doi:10.1007/s00158-012-0845-x

Cited by 38 publications

(17 citation statements)

References 16 publications

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“…The BT shell element is very cost effective and has been widely used in both metal forming and crash applications [ 21 ]. More recently, the BT shell has been successfully applied in predicting the dynamic response of sandwich structures under blast impacts [ 5 , 8 ]. In addition, the 8-noded brick elements were used for modeling the foam core.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…These sandwich panels generally consist of a cellular core for energy dissipation and two metallic face-sheets which provide high strength and stiffness for the structure. Extensive efforts have been exerted on the dynamic response of blast loaded sandwich structures containing cellular cores using analytical [ 2 – 4 ], numerical [ 5 – 8 ], experimental [ 9 , 10 ], and combined methods [ 11 – 13 ]. Since most sandwich panels are nonaxisymmetric, for which the principal stress directions are unknown in advance, a complete theoretical analysis of their dynamic response is rather complicated, especially when the deformation is large [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Response and Optimal Design of Curved Metallic Sandwich Panels under Blast Loading

Yang

et al. 2014

The Scientific World Journal

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It is important to understand the effect of curvature on the blast response of curved structures so as to seek the optimal configurations of such structures with improved blast resistance. In this study, the dynamic response and protective performance of a type of curved metallic sandwich panel subjected to air blast loading were examined using LS-DYNA. The numerical methods were validated using experimental data in the literature. The curved panel consisted of an aluminum alloy outer face and a rolled homogeneous armour (RHA) steel inner face in addition to a closed-cell aluminum foam core. The results showed that the configuration of a “soft” outer face and a “hard” inner face worked well for the curved sandwich panel against air blast loading in terms of maximum deflection (MaxD) and energy absorption. The panel curvature was found to have a monotonic effect on the specific energy absorption (SEA) and a nonmonotonic effect on the MaxD of the panel. Based on artificial neural network (ANN) metamodels, multiobjective optimization designs of the panel were carried out. The optimization results revealed the trade-off relationships between the blast-resistant and the lightweight objectives and showed the great use of Pareto front in such design circumstances.

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Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Response and Optimal Design of Curved Metallic Sandwich Panels under Blast Loading

Yang

et al. 2014

The Scientific World Journal

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“…Honeycomb cores subjected to crushing were studied by Aktay et al [22], where methods of modeling honeycomb were validated by experiments, with good agreement. Nayak et al [23] utilized honeycomb sandwich panels and illustrated their use for blast load mitigation. Additional work on honeycomb was conducted by Sun et al [24].…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of lightweight ultra high strength steel sandwich for energy absorption

et al. 2020

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Legislation regarding greenhouse gas emissions forces automotive manufacturers to bring forth new and innovative materials and structures for weight reduction of the body-in-white. The present work evaluates a lightweight ultra high strength steel sandwich concept, with perforated cores, for energy absorption applications. Hat-profile geometries, subjected to crushing, are studied numerically to evaluate specific energy absorption for the sandwich concept and solid hat-profiles of equivalent weight. Precise discretization of the perforated core requires large computational power. In the present work, this is addressed by homogenization, replacing the perforated core with a homogeneous material with equivalent mechanical properties. Input data for the equivalent material is obtained by analyzing a representative volume element, subjected to in-plane loading and out-of-plane bending/twisting using periodic boundary conditions. The homogenized sandwich reduces the number of finite elements and thereby computational time with approximately 95%, while maintaining accuracy with respect to force–displacement response and energy absorption. It is found that specific energy absorption is increased with 8–17%, when comparing solid and sandwich hat profiles of equivalent weight, and that a weight saving of at least 6% is possible for equivalent performance.

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“…They have shown that the square honeycomb panels are capable of withstanding air blast loads. Nayak et al (2012) presented a method of optimizing sandwich panels so as to minimize the effects of air blast loading. The sandwich panel consisted of two metal face plates with a crushable honeycomb core.…”

Section: Introductionmentioning

confidence: 99%

Modeling, Simulation and Optimization of Steel Sandwich Panels under Blast Loading

Soleimani¹,

Ghareeb²,

Shaker³

2018

American Journal of Engineering and Applied Sciences

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Honeycomb sandwich panels are commonly preferred in structural engineering as a design element meant to protect against blast loading, and this owes primarily to the fact that they are light in weight (due to the voids present) whilst carrying high energy absorption capacities. A widespread surge in acts of terrorism, and the resultant threat posed to structures, presents structural engineers with unique challenges pertaining to the design of blast-resistant structures that are both safe and reliable. Researchers worldwide have thus taken to closely studying the effects of sudden loads effected by detonative forces on certain elements and design concepts. To this end, an emergent design concept with proven efficacy is the honeycomb sandwich panel. Due to the practical difficulties associated with the study of explosive materials and replicating blast loads, softwarebased modeling and simulation may be favorable as a functional and convenient alternative. To this end, this work uses the finite element package ABAQUS ® to study the behavior of hexagonal and squared honeycomb steel sandwich panels under the explosive effects of different amounts of trinitrotoluene (TNT). The results of finite element modeling of a specific honeycomb configuration are initially validated by comparing them with the experimental results from literature. Several configurations including different geometrical properties of the honeycomb wall are then investigated and the results are compared. Consequently, an optimization study is conducted with an objective to reduce the plastic strain of the back plate while the wall cell thickness is taken as a variable. Finally, the effectiveness of the core shape and wall thickness is discussed and conclusions are made.

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Process for design optimization of honeycomb core sandwich panels for blast load mitigation

Cited by 38 publications

References 16 publications

Dynamic Response and Optimal Design of Curved Metallic Sandwich Panels under Blast Loading

Dynamic Response and Optimal Design of Curved Metallic Sandwich Panels under Blast Loading

Numerical evaluation of lightweight ultra high strength steel sandwich for energy absorption

Modeling, Simulation and Optimization of Steel Sandwich Panels under Blast Loading

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