Impact and close-in blast response of auxetic honeycomb-cored sandwich panels: Experimental tests and numerical simulations

Qi, Chang; Remennikov, Alexander; Pei, Lian-Zheng; Yang, Shu; Yu, Zhi-Hang; Ngo, Tuan

doi:10.1016/j.compstruct.2017.08.020

Cited by 312 publications

(108 citation statements)

References 42 publications

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“…The effect of design changes on Young's modulus and Poisson's ratio can be adjusted and improved before manufacture [121], and FEM can validate analytical results [151][152][153][154][155][156][157][158]. Full validation of FEM often requires comparison and agreement with experimental testing [159][160][161][162][163][164][165][166][167], which can potentially lead to extrapolation or tailoring of models for specific applications.…”

Section: Modelling Auxetic Materials and Structuresmentioning

confidence: 99%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

239

151

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Following high profile, life changing long term mental illnesses and fatalities in sports such as skiing, cricket and American football-sports injuries feature regularly in national and international news. A mismatch between equipment certification tests, user expectations and infield falls and collisions is thought to affect risk perception, increasing the prevalence and severity of injuries. Auxetic foams, structures and textiles have been suggested for application to sporting goods, particularly protective equipment, due to their unique form-fitting deformation and curvature, high energy absorption and high indentation resistance. The purpose of this critical review is to communicate how auxetics could be useful to sports equipment (with a focus on injury prevention), and clearly lay out the steps required to realise their expected benefits. Initial overviews of auxetic materials and sporting protective equipment are followed by a description of common auxetic materials and structures, and how to produce them in foams, textiles and Additively Manufactured structures. Beneficial characteristics, limitations and commercial prospects are discussed, leading to a consideration of possible further work required to realise potential uses (such as in personal protective equipment and highly conformable garments).

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Section: Modelling Auxetic Materials and Structuresmentioning

confidence: 99%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

239

151

View full text Add to dashboard Cite

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“…Low mass and high stiffness make them attractive as engineering materials [5]. They have been started to be used in this field of application in leading branches of industry (automotive [6,7], aviation [8], railway [9], bio-engineering [10,11] and military [12][13][14]) as well as in civil engineering and modern art. Furthermore, high porosity resulted from a low value of relative density causes that they can be used as an effective thermal-, sound-and vibro-insulators [15,16].…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Mechanical Response of Gradient Lattice Structures Manufactured via SLM

Sienkiewicz

Płatek

Jiang

et al. 2020

Metals

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The main aim of the paper is to evaluate the mechanical behavior or lattice specimens subjected to quasi-static and dynamic compression tests. Both regular and three different variants of SS 316L lattice structures with gradually changed topologies (discrete, increase and decrease) have been successfully designed and additively manufactured with the use of the selective laser melting technique. The fabricated structures were subjected to geometrical quality control, microstructure analysis, phase characterization and compression tests under quasi-static and dynamic loading conditions. The mismatch between dimensions in the designed and produced lattices was noticed. It generally results from the adopted technique of the manufacturing process. The microstructure and phase composition were in good agreement with typical ones after the additive manufacturing of stainless steel. Moreover, the relationship between the structure relative density and its energy absorption capacity has been defined. The value of the maximum deformation energy depends on the adopted gradient topology and reaches the highest value for a gradually decreased topology, which also indicates the highest relative density. However, the highest rate of densification was observed for a gradually increasing topology. In addition, the results show that the gradient topology of the lattice structure affects the global deformation under the loading. Both, static and dynamic loading resulted in both barrel- and waisted-shaped deformation for lattices with an increasing and a decreasing gradient, respectively. Lattice specimens with a gradually changed topology indicate specific mechanical properties, which make them attractive in terms of energy absorption applications.

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“…[5,19,46,47] Among these, one of the structures that has attracted most attention is the re-entrant hexagonal honeycomb. [14,43,44] As a result, this structure has been extensively studied, [14,44,[48][49][50][51] together with its variants such as its hierarchical form [45] and 3D extension [52][53][54] as well as its implementation in sandwich panels [55,56] or at molecular level. [43,57] However, most of the investigations on the structure appear to have used the unit-cell approach and focused primarily on the bulk properties of the system rather than real samples where the number of honeycomb cells is finite.…”

Section: Introductionmentioning

confidence: 99%

Edge Effects of a Hexagonal Honeycomb on the Poisson's Ratio and Young's Modulus

Farrugia

Gatt

Vrieze

et al. 2020

Physica Status Solidi (b)

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The flexing of the ligaments at the edge of a finite hexagonal honeycomb array is studied using analytical and numerical methods. It is shown that when compressed axially, the ligaments on the border of a hexagonal honeycomb array bend outwardly in contrast to the interior ligaments that bend to a negligible extent, if at all. This boundary effect reduces the overall auxeticity of re-entrant hexagonal honeycombs. Analytical expressions that account for the edge effects on the Poisson's ratio and Young's modulus are obtained using Castigliano's second theorem. These are then tested against numerical simulations showing good agreement at least for the values of the parameters used. Additional investigations indicate that the use of a larger ligament thickness for the ligaments residing on the border of the system mitigates this edge effect on the Poisson's ratio.

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Impact and close-in blast response of auxetic honeycomb-cored sandwich panels: Experimental tests and numerical simulations

Cited by 312 publications

References 42 publications

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Investigations on the Mechanical Response of Gradient Lattice Structures Manufactured via SLM

Edge Effects of a Hexagonal Honeycomb on the Poisson's Ratio and Young's Modulus

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