Blast response study of the sandwich composite panels with 3D chiral auxetic core

Novak, Nejc; Starčevič, Luka; Vesenjak, Matej

doi:10.1016/j.compstruct.2018.11.050

Cited by 164 publications

(75 citation statements)

References 26 publications

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“…The computational study is performed using FEM-code LS DYNA. The computational model of chiral auxetic structure is validated based on the uniaxial compression experimental tests which were previously presented in the article [2]. To introduce the multiaxial loading conditions, four rigid plates are considered in treated computational model (see section 2.2).…”

Section: Computational Analysismentioning

confidence: 99%

“…The geometry of the unit cell is shown in Fig. 1a, where the struts take the sinusoidal shape, whose turning points meet in the nodal points [2]. The geometric parameters of the unit cell are the following: a nodal distance in horizontal (Lhor) and vertical (Lver) directions, amplitude (Ai) and strut thickness (d).…”

Section: Geometries Of Chiral Auxetic Structuresmentioning

confidence: 99%

“…The geometry of chiral auxetic structure was discretised with beam finite elements with cross-section integration. The mesh sensitivity analysis was performed on three different finite element mesh densities [2]. The global size of beam finite elements 0.5 mm was assumed.…”

Section: Boundary Conditions and The Finite Element Meshmentioning

confidence: 99%

“…[1]. In modern engineering practice cellular structures are mainly used as core of a composite sandwich structures and, consequently, offer very good energy absorption to weight ratio [2], [3]. The new type of cellular structures are auxetic cellular structures, which are new type of meta-materials which exhibit negative Poisson's ratio.…”

Section: Introductionmentioning

confidence: 99%

“…This study is based on the previous research work presented in [2] where a computational model of chiral auxetic structure was built and validated. In this study, the validated computational model was used as a basis for the computational investigation of a fracture behaviour of the 3D chiral auxetic structure under multiaxial loading conditions.…”

Section: Introductionmentioning

confidence: 99%

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Computational simulation of fracture behaviour in auxetic cellular structure by multiaxial loading

et al. 2019

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A computational simulation of fracture behaviour in auxetic cellular structure, subjected to multiaxial loading is presented in this paper. A fracture behaviour of the 3D (three-dimensional) chiral auxetic structure under multiaxial loading conditions was studied. The computational models were used to study the geometry effect of the unit cell on the Poisson's ratio and fracture behaviour of the analysed chiral auxetic structure. A 3D computational model was built using FEM-code LS DYNA. The discrete computational model of chiral auxetic structure was built using beam finite elements. The lattice model of the analysed auxetic structure was positioned between rigid plates and assembled in a way to simulate a hydrocompression loading conditions. Between the contacting surfaces interactions in normal (contact) and tangential direction (friction) with the node-to-surface approach were simulated. A developed computational model offers insight in the fracture behaviour of considered auxetic cellular structure and helps to better understanding their crushing behaviour under impact multiaxial loading.

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Section: Computational Analysismentioning

confidence: 99%

Section: Geometries Of Chiral Auxetic Structuresmentioning

confidence: 99%

Section: Boundary Conditions and The Finite Element Meshmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational simulation of fracture behaviour in auxetic cellular structure by multiaxial loading

et al. 2019

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Strain Dependency of Poisson's Ratio of SLS Printed Auxetic Lattices Subjected to Quasi‐Static and Dynamic Compressive Loading

et al. 2019

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This paper deals with experimental investigation into a strain‐rate dependent function of Poisson's ratio of three auxetic structures subjected to compressive loading. The missing rib, the 2D re‐entrant honeycomb, and the 3D re‐entrant honeycomb lattices printed using selective laser sintering from powdered SS316L austenitic steel are investigated. The samples are subjected to uni‐axial compression under quasi‐static conditions and dynamic conditions using the Split Hopkinson Pressure Bar (SHPB). The deforming specimens are optically observed in order to apply a digital image correlation for evaluation of the in‐plane displacement and strain fields. From the calculated strain fields, the function of Poisson's ratio is calculated for each experiment using different methods taking specific regions of interest of the specimen microstructures into account. The obtained functions of Poisson's ratio are plotted for each microstructure and strain‐rate. The analysis of the results shows that the strain‐rate has a significant influence on the deformation characteristics of all the investigated microstructures yielding differences in the magnitude of the minima of Poisson's ratio and the differences in the maximum overall compressive strain, where the lattices are still auxetic.

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Impact Behavior of Additively Manufactured Stainless Steel Auxetic Structures at Elevated and Reduced Temperatures

et al. 2020

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Metamaterials produced using additive manufacturing represent advanced structures with tunable properties and deformation characteristics. However, the manufacturing process, imperfections in geometry, properties of the base material as well as the ambient and operating conditions often result in complex multiparametric dependence of the mechanical response. As the lattice structures are metamaterials that can be tailored for energy absorption applications and impact protection, the investigation of the coupled thermomechanical response and ambient temperature‐dependent properties is particularly important. Herein, the 2D re‐entrant honeycomb auxetic lattice structures additively manufactured from powdered stainless steel are subjected to high strain rate uniaxial compression using split Hopkinson pressure bar (SHPB) at two different strain rates and three different temperatures. An in‐house developed cooling and heating stages are used to control the temperature of the specimen subjected to high strain rate impact loading. Thermal imaging and high‐speed cameras are used to inspect the specimens during the impact. It is shown that the stress–strain response as well as the crushing behavior of the investigated lattice structures are strongly dependent on both initial temperature and strain rate.

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Blast response study of the sandwich composite panels with 3D chiral auxetic core

Cited by 164 publications

References 26 publications

Computational simulation of fracture behaviour in auxetic cellular structure by multiaxial loading

Computational simulation of fracture behaviour in auxetic cellular structure by multiaxial loading

Strain Dependency of Poisson's Ratio of SLS Printed Auxetic Lattices Subjected to Quasi‐Static and Dynamic Compressive Loading

Impact Behavior of Additively Manufactured Stainless Steel Auxetic Structures at Elevated and Reduced Temperatures

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