Dynamic Crushing Strength Analysis of Auxetic Honeycombs

Hou, Xiuhui; Deng, Zichen; Zhang, Kai

doi:10.1016/s0894-9166(16)30267-1

Cited by 126 publications

(50 citation statements)

References 18 publications

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“…Their studies pointed out that the auxetic effects determines the impact response of the re-entrant honeycomb by affecting the crushing pattern. A similar conclusion was also reported by Xiuhui Hou et al [16], who attributed the superior impact resistance of auxetic honeycombs to the auxetic effect induced in the re-entrant topology.…”

Section: Introductionsupporting

confidence: 88%

Dynamic Crushing Analysis of a Three-Dimensional Re-Entrant Auxetic Cellular Structure

Wang

et al. 2019

Materials

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Dynamic behaviors of the three-dimensional re-entrant auxetic cellular structure have been investigated by performing beam-based crushing simulation. Detailed deformation process subjected to various crushing velocities has been described, where three specific crushing modes have been identified with respect to the crushing velocity and the relative density. The crushing strength of the 3D re-entrant auxetic structure reveals to increase with increasing crushing velocity and relative density. Moreover, an analytical formula of dynamic plateau stress has been deduced, which has been validated to present theoretical predictions agreeing well with simulation results. By establishing an analytical model, the role of relative density on the energy absorption capacity of the 3D re-entrant auxetic structure has been further studied. The results indicate that the specific plastic energy dissipation is increased by increasing the relative density, while the normalized plastic energy dissipation has an opposite sensitivity to the relative density when the crushing velocity exceeds the critical transition velocity. The study in this work can provide insights into the dynamic property of the 3D re-entrant auxetic structure and provides an extensive reference for the crushing resistance design of the auxetic structure.

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Section: Introductionsupporting

confidence: 88%

Dynamic Crushing Analysis of a Three-Dimensional Re-Entrant Auxetic Cellular Structure

Wang

et al. 2019

Materials

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“…The energy absorption of a re-entrant structure when crushed by a rigid wall has been analysed [175], but not experimentally validated. Analytical formulae were however used to validate FEM suggestions that auxetic honeycombs have higher energy absorption than conventional honeycombs in crushing strength analysis [176]. When varying the impact energy on a jounce bumper [27,177], FEM closely matched experimental values for the material's Poisson's ratio and compressive modulus and the jounce bumper's force and displacement.…”

Section: Modelling Auxetic Materials and Structuresmentioning

confidence: 95%

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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“…It is evident form Figure 6 that the PDE with respect to the time of direction D1 is higher than that of D2. This can be justified to the auxetic effect that leads to more energy absorption [21]. In terms of the reaction force (Figure 7), D1 showed better performance with less RFd/P ratio, except for the final collapse reaction.…”

Section: Parametric Studymentioning

confidence: 94%

“…The 3rd is the plateau region where plastic bending occurs. The last is the densification state, when the cell walls touch each other [21]. It is the plateau region that is important in characterizing the dynamic crushing of auxetic structures for energy absorbing applications [37].…”

Section: Final Properties Of the Ugadmentioning

confidence: 99%

“…Analytical [15,16], numerical [17,18] and experimental [19,20] studies have been conducted to describe their mechanical properties and response. However, recent studies confirm that the unique behaviour of the negative Poisson’s ratio in auxetic structures provides better energy absorption than the traditional honeycomb (hexagonal) topology [21,22]. Hence, auxetic structures were selected for the design of the passive damping system in this paper.…”

Section: Introductionmentioning

confidence: 99%

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The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

Al-Rifaie

Sumelka

2019

Materials

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Auxetic structures are efficient cellular materials that can absorb blast/impact energy through plastic deformation, thus protecting the structure. They are developing sacrificial solutions with light weight, high specific strength, high specific toughness and excellent energy dissipating properties, due to its negative Poison’s ratio nature. The use of auxetic and non-auxetic panels in blast resistant structures had been relatively perceived by researchers. Nonetheless, implementation of those energy dissipaters, explicitly as a uni-axial passive damper is restrained to limited studies, which highlight the potential need for further explorations. The aim of this paper is the design of a new uniaxial graded auxetic damper (UGAD) that can be used as a blast/impact/shock absorber in different scales for different structural applications. First, the geometry, material, numerical model and loading are introduced. Then, a detailed parametric study is conducted to achieve the most efficient graded auxetic system. Moreover, the designed auxetic damper is numerically tested and its static and dynamic constitutive relations are derived and validated analytically. The selection of optimum parameters was based on the ratio of the reaction force to the applied load (RFd/P) and plastic dissipation energy (PDE). The final designed UGAD contains three auxetic cores that have the same geometry, material grade (6063-T4), size and number of layers equal to eight. The cell-wall thickness t of the three auxetic cores is 1.4 mm, 1.8 mm and 2.2 mm, respectively; composing a graded auxetic system. The performance of the three auxetic cores together have led to a wide plateau region (80% of total crushing strain) and variant strength range (1–10 MPa), which in return, can justify the superior performance of the UGAD under different blast levels. Finally, the 3D printed prototype of the UGAD is presented and the possible applications are covered.

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Dynamic Crushing Strength Analysis of Auxetic Honeycombs

Cited by 126 publications

References 18 publications

Dynamic Crushing Analysis of a Three-Dimensional Re-Entrant Auxetic Cellular Structure

Dynamic Crushing Analysis of a Three-Dimensional Re-Entrant Auxetic Cellular Structure

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

The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

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