Finite element-based optimisation of an elastomeric honeycomb for impact mitigation in helmet liners

Adams, Rhosslyn; Townsend, Scott; Soe, Shwe; Theobald, Peter

doi:10.1016/j.ijmecsci.2021.106920

Cited by 21 publications

(7 citation statements)

References 53 publications

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“…Such quasi-continuum structures, either with small unit cells or large external dimensions, would be more complex to make and test, respectively. While these may not be commercially viable, development of the underlying theory remains important, with implications for the analysis of biological tissue [30,31], composites [32][33][34], other lattices or mechanical metamaterials [59][60][61], or foams where twisting occurs within cells (rather than externally) [62]. Conversely, testing such materials may provide another option to develop the theory, although with less twist the effect sizes would be smaller, placing greater requirements on experimental accuracy.…”

Section: Discussionmentioning

confidence: 99%

Effect of twist on indentation resistance

Duncan

Chester

Wang

et al. 2023

Materials Today Communications

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Section: Discussionmentioning

confidence: 99%

Effect of twist on indentation resistance

Duncan

Chester

Wang

et al. 2023

Materials Today Communications

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“…The specific energy absorption of the MDRH structure is much higher than that of the TRH structure at all impact velocities, which indicates that the MDRH structure has a better energy absorption capacity per unit mass than the TRH structure. This implies that the MDRH is more reasonable and economically efficient [50,51].…”

Section: Plateau Stress and Specific Energy Absorptionmentioning

confidence: 99%

Impact resistance of a double re-entrant negative poisson’s ratio honeycomb structure

Hai,

Chen,

Wang

et al. 2024

Phys. Scr.

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Auxetic metamaterials, usually consisting of cellular solids or honeycombs, exhibit the advantages of high designability and tunability. In particular, the negative Poisson’s ratio (NPR) property endows them with innovative mechanical properties and makes them promising for a wide range of applications. This paper proposes a modified double re-entrant honeycomb (MDRH) structure and explores its Young's modulus and Poisson's ratio through theoretical derivation and finite element analysis. Additionally, it discusses the relationship between these parameters and the concave angle. Furthermore, the deformation mode, nominal stress-strain curve, and specific energy absorption of this MDRH are investigated for different impact velocities and compared with traditional re-entrant honeycomb (TRH) materials. The results show that the MDRH honeycomb structure greatly widens the range of effective modulus and NPR values. At different impact velocities, the MDRH exhibits high plateau stress and specific energy absorption, indicating good impact resistance. These results provide a theoretical foundation for the design and implementation of new energy-absorbing structures.

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“…The pre-buckled honeycomb structure was optimised using a finite element-based strategy [51]. A periodic boundary condition (PBC) model was adopted to approximate the response to impact loading, avoiding the computational cost associated with successive simulations of a full-scale honeycomb helmet configuration.…”

Section: Finite Element-based Optimisationmentioning

confidence: 99%

“…In this study, we report on the same, pre-buckled honeycomb with variable out-of-plane behaviour, for use in head protection. Here we utilise a previously reported finite-element based strategy for the optimisation of cellular structures, subject to multi-impact loading conditions [51]. Whilst most studies focus on single-use conventional honeycombs derived from metals and rigid polymer, an elastomeric material definition is used which affords recoverability, suited for helmet applications requiring energy absorption across consecutive impacts.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of an elastomeric pre-buckled honeycomb helmet liner for advanced impact mitigation

Adams

Soe

Theobald

2023

Smart Mater. Struct.

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Advances in computational modelling now offer an efficient route to developing novel helmet liners that could exceed contemporary materials' performance. Furthermore, the rise of accessible additive manufacturing presents a viable route to achieving otherwise unobtainable material structures. This study leverages an established finite element-based approach to the optimisation of cellular structures for the loading conditions of a typical helmet impact. A novel elastomeric pre-buckled honeycomb structure is adopted and optimised, the performance of which is baselined relative to vinyl nitrile foam under direct and oblique loading conditions. Results demonstrate that a simplified optimisation strategy is scalable to represent the behaviour of a full helmet. Under oblique impact conditions, the optimised pre-buckled honeycomb liner exceeds the contemporary material performance when considering computed kinematic metrics head and rotational injury criterion, by up to 49.9% and 56.6%. Furthermore, when considering tissue-based severity metrics via finite element simulations of a human brain model, maximum principal strain and cumulative strain density measures are reduced by 14.9% and 66.7% when comparing the new material, to baseline.

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Finite element-based optimisation of an elastomeric honeycomb for impact mitigation in helmet liners

Cited by 21 publications

References 53 publications

Effect of twist on indentation resistance

Effect of twist on indentation resistance

Impact resistance of a double re-entrant negative poisson’s ratio honeycomb structure

Optimisation of an elastomeric pre-buckled honeycomb helmet liner for advanced impact mitigation

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