Design of energy-dissipating structure with functionally graded auxetic cellular material

Hou, Wenbin; Yang, Xing; Zhang, Wei; Xia, Yang

doi:10.1080/13588265.2017.1328764

Cited by 80 publications

(33 citation statements)

References 22 publications

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“…al (2018)). Hou et al (2018) compared a uniform cell design with a present functionally gradient auxetic celluler structure subjected to low speed collision. Impact tests demonstrated that gradient auxetic crash box has higher energy absorption and lower reaction force than uniform auxetic crash box.…”

Section: Introductionmentioning

confidence: 99%

Impact behavior of triggered and non-triggered crash tubes with auxetic lattices

Usta

Ertaş

Ataalp

et al. 2018

Multiscale and Multidiscip. Model. Exp. and Des.

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In this study, impact behavior of triggered and non-triggered tubes with and without auxetic filler are examined by using numerical methods. Material properties of tubes made of aluminum alloy and auxetic lattices utilizing ABSplus plastics are determined by using tensile tests. Finite element analyses are performed by using LS-DYNA software at 5 m/s impact velocity. Two different trigger shape are suggested and compared each other and discussed the advantages and disadvantages over nontriggered tubes. For these loading conditions, trigger mechanism provides lower peak forces and higher crash force efficiency (CFE), but lower specific energy absorption (SEA). Also, the effects of using auxetic fillers in these triggered tubes are investigated in terms crashworthiness characteristics.

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Section: Introductionmentioning

confidence: 99%

Impact behavior of triggered and non-triggered crash tubes with auxetic lattices

Usta

Ertaş

Ataalp

et al. 2018

Multiscale and Multidiscip. Model. Exp. and Des.

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“…Besides being lightweight and keeping a high strength-to-weight ratio, lattice structures possess important characteristics which make them appropriate in engineering. Among these properties are: energy absorption [4], heat transfer [5], and vibration and acoustic damping [6]. Authors also evaluate specific mechanical characteristics.…”

Section: Lattice Structures In Additive Manufacturingmentioning

confidence: 99%

“…Lattice structures are families of repetitive architectures whose distribution of void/filled sections can be controlled. Moreover, the attractiveness of lattice structures lies in their ability to retain good mechanical properties (e.g., high strength-to-weight ratio, energy absorption) while saving material [4][5][6]. Current works aim to use surface lattice materials for converting density maps into manufacturable workpieces.…”

Section: Introductionmentioning

confidence: 99%

Density-Sensitive Implicit Functions Using Sub-Voxel Sampling in Additive Manufacturing

Montoya-Zapata

Moreno

Pareja-Corcho

et al. 2019

Metals

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In the context of lattice-based design and manufacturing, the problem of physical realization of density maps into lattices of a particular family is central. Density maps are prescribed by design optimization algorithms, which seek to fulfill structural demands on a workpiece, while saving material. These density maps cannot be directly manufactured since local graded densities cannot be achieved using the bulk solid material. Because of this reason, existing topology optimization approaches bias the local voxel relative density to either 0 (void) or 1 (filled). Additive manufacturing opens possibilities to produce graded density individuals belonging to different lattice families. However, voxel-level sampled boundary representations of the individuals produce rough and possibly disconnected shells. In response to this limitation, this article uses sub-voxel sampling (largely unexploited in the literature) to generate lattices of graded densities. This sub-voxel sampling eliminates the risk of shell disconnections and renders better surface continuity. The manuscript devises a function to produce Schwarz cells that materialize a given relative density. This article illustrates a correlation of continuity against stress concentration by simulating C 0 and C 1 inter-lattice continuity. The implemented algorithm produces implicit functions and thus lattice designs which are suitable for metal additive manufacturing and able to achieve the target material savings. The resulting workpieces, produced by outsource manufacturers, are presented. Additional work is required in the modeling of the mechanical response (stress/strain/deformation) and response of large lattice sets (with arbitrary geometry and topology) under working loads.

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“…en, sandwich structures with combined conventional and re-entrant hexagonal metamaterials were investigated based on various characteristics, such as the specified objective deformations [28]; the strength and failure properties under bending, compressive and impact loads [29][30][31]; the dynamic behavior [32,33]; and the sound transmission performance [23,34]. Moreover, functionally gradient auxetic metamaterials based on other topologies, such as double arrowhead honeycombs (DAHs), have been developed [35][36][37][38] in recent years.…”

Section: Introductionmentioning

confidence: 99%

Vibration and Sound Transmission Performance of Sandwich Panels with Uniform and Gradient Auxetic Double Arrowhead Honeycomb Cores

Yang

2019

Shock and Vibration

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Auxetic mechanical metamaterials that exhibit a negative Poisson’s ratio (NPR) can be artificially designed to exhibit a unique range of physical and mechanical properties. Novel sandwich structures composed of uniform and gradient auxetic double arrowhead honeycomb (DAH) cores were investigated in terms of their vibration and sound transmission performance stimulated by nonhomogeneous metamaterials with nonperiodic cell geometries. The spectral element method (SEM) was employed to accurately evaluate the natural frequencies and dynamic responses with a limited number of elements at high frequencies. The results indicated that the vibrating mode shapes and deformations of the DAH sandwich models were strongly affected by the patterned gradient metamaterials. In addition, the sound insulation performance of the considered DAH sandwich models was investigated regarding the sound transmission loss (STL) from 1 Hz to 1500 Hz under a normal incident planar wave, and this performance was compared with that for hexagonal honeycomb sandwich panels. A programmable structural-acoustic optimization was implemented to maximize the STL while maintaining a constant weight and high strength. The results showed that the uniform DAH sandwich models with larger NPRs generally exhibited better vibration and acoustic attenuation behaviors and that the optimized gradient increasing NPR models yielded higher STL values than the optimized gradient decreasing NPR models for two specified frequency cases, with improvements of 6.52 dB and 2.52 dB and a higher bending stiffness but a lower overall STL. Thus, sandwich panels consisting of auxetic DAHs can achieve desirable vibroacoustic performance with a higher bending stiffness than conventional hexagonal honeycomb sandwich structures, and the design of gradient DAHs can be extended to obtain optimized vibration and noise-control capabilities.

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Design of energy-dissipating structure with functionally graded auxetic cellular material

Cited by 80 publications

References 22 publications

Impact behavior of triggered and non-triggered crash tubes with auxetic lattices

Impact behavior of triggered and non-triggered crash tubes with auxetic lattices

Density-Sensitive Implicit Functions Using Sub-Voxel Sampling in Additive Manufacturing

Vibration and Sound Transmission Performance of Sandwich Panels with Uniform and Gradient Auxetic Double Arrowhead Honeycomb Cores

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