Impact behavior of auxetic structures: Experimental and numerical analysis

Mohan, A.; Mondal, Prasanna Kumar; Jayaganthan, R.

doi:10.1016/j.matpr.2023.05.631

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…Moreover, AM route is economically sustainable due to design freedom, simplification in part fixturing, and proper utilization of feedstock materials [25]. FFF [26,27], MJF [28,29], FDM [30,31], SLA [32,33], SLS [34,35], and SLM [36,37], etc. are widely used for the fabrication of vibrational energy harvester, vessel stent [38], lightweight auxetic frames for smart sensors [39], vascular scaffolds [40], star-rhombic honeycomb structure for explosion proof containers and fuselages of the aerial vehicles [41,42].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations into 3D printed hybrid auxetic structures for load-bearing and energy absorption applications

Bankar,

Das,

Sharma

2024

Smart Mater. Struct.

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Auxetic structures possess negative Poisson’s ratio due to their unique geometrical configuration. It also offers enhanced indentation resistance, superior energy absorption capacity, excellent impact resistance, higher compressive strength, and other exceptional mechanical properties. In this study, multiple hybrid auxetic structures of three novel geometries have been designed by considering different sets of geometric parameters to numerically investigate the mechanical behaviors of the structures. The energy absorption properties and Poisson’s ratio of the developed hybrid auxetic structures have been measured under quasi-static compressive and bending loads. The numerically optimized structures from each of the three different geometries have been fabricated of acrylonitrile butadiene styrene using fused deposition modeling. Additionally, the simulated results have been experimentally validated. The validation studies have shown close agreement of their performances with the simulated results. Finally, comparative analyses of energy absorption performances have also been performed to select the most suitable structure for impact-resistant applications. Moreover, it has been observed that structure-2 exhibits superior performance in terms of maximum load-bearing capacity of 3395 N. On the other hand, structure-3 has the maximum energy absorption capacity of 51902 N.mm which is 4.85% higher than structure-1 and structure-2. Similarly, three-point bending test results have revealed that structure-2 performs better in terms of energy absorption capacity (10864 N.mm). Besides this, the effects of loading direction on deformation patterns and mechanical responses of the structures have been observed due to the changes in deformation mechanism. The high-velocity (8 m.s−1) impact test results have also confirmed the suitability of structure-2 for crashworthiness applications. The comparative findings derived from this study contribute significantly in developing lightweight, energy-absorbent, and impact-resistant auxetic core-sandwiched structures for civil, defense, and automobile sectors.

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Section: Introductionmentioning

confidence: 99%

Experimental investigations into 3D printed hybrid auxetic structures for load-bearing and energy absorption applications

Bankar,

Das,

Sharma

2024

Smart Mater. Struct.

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Aircraft Wing Morphing Using Auxetic Structures

SHATINDRA,

NAVALGUND,

et al. 2024

International Journal of Innovative Science and Research Techno

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Cellular materials exhibit two key properties: structures and mechanisms. This allows for the design of structures using cellular materials while effectively controlling both stiffness and flexibility, based on the connectivity of the struts. This study aims to explore the in-plane flexible properties of cellular materials dominated by bending under macroscopic deformation. Additionally, it seeks to establish a method for designing a passive morphing airfoil with flexible cellular cores. The investigation focuses on airfoils featuring re-entrant and S-shaped cellular cores, analyzing their behavior under static loads by examining the deformation of the cellular cores subjected to aerostatic loads. In the context of the airfoil's deformation with flexible cellular cores under aerostatic loading, shear emerges as the predominant deformation mode for the cores of the airfoil. Wings of conventional aircraft are optimized for only a few conditions, not for the entire flight envelope. Therefore, it is necessary to develop the morphing airfoil with smart structures for the next generation of excellent aircraft. In this project, this was made possible using, re-entrant and S-shaped auxetic structures as a member of the meta- material family, with negative Poisson's ratio to enable an effortless passive morphing mechanism as it has high flexibility along in-plane direction (chord-wise). The 3D CAD Models of Re-entrant and S-shaped auxetic airframes were designed and analyzed. Initially, Static Structural analysis is performed on both airframes to observe the structure’s behavior, and design modification and optimization are performed in different iterations. With a reduction in maximum equivalent stress by 20%, the Re-entrant airframe exhibits lower stress and hence more flexibility. The wings were modeled with a span of 1m using auxetic airframes, air pressure was generated using CFD analysis with MACH 0.45. Finally, the fluid-structure interaction was done by importing the air pressure and performing static structural analysis for the structural performance of wings using auxetic airframes. It was found that Re-entrant auxetic wing showed an increase of 9.99% in load carrying capacity, accompanied by a decrease of 389 grams of weight when compared to S-shaped auxetic wing. Considering the deformation of the airframe with flexible cellular cores under a load, the re-entrant honeycomb core shows the highest flexibility in shear and causes lower stress than the S-auxetic cores. This implies that the re-entrant honeycomb core has the potential for passive morphing.

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Impact behavior of auxetic structures: Experimental and numerical analysis

Cited by 2 publications

References 19 publications

Experimental investigations into 3D printed hybrid auxetic structures for load-bearing and energy absorption applications

Experimental investigations into 3D printed hybrid auxetic structures for load-bearing and energy absorption applications

Aircraft Wing Morphing Using Auxetic Structures

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