Experimental and numerical analysis of the bending behavior of 3D printed modified auxetic sandwich structures

Choudhry, Niranjan Kumar; Bankar, Shailesh Ravindra; Panda, Biranchi; Singh, Harpreet

doi:10.1016/j.matpr.2021.11.425

Cited by 21 publications

(10 citation statements)

References 18 publications

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“…Novak et al [ 144 ] studied mechanical properties of chiral auxetic sandwich structure and found that energy absorption capability of structure increase with decrease in thickness of face sheets. Choudhry et al [ 145 ] proved that use of modified re‐entrant structures as a core of sandwich panels significantly increases the energy absorption capabilities and load bearing capacities.…”

Section: Literature Reviewmentioning

confidence: 99%

State of the art review on mechanical properties of sandwich composite structures

Patekar

Kale

2022

Polymer Composites

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Sandwich composite structures are widely used in various industries namely, aerospace, automotive, packaging, biomedical, civil and electronics due to their high specific strength and energy absorption capabilities. Mechanical properties of sandwich structure depend on material properties of face sheet and core, and strength of face sheet-core interface. Most commonly used composite materials are carbon fiber reinforced plastics, glass fiber reinforced plastics, ceramic matrix composites, and metal matrix composites. Several researchers have used nano-fillers namely, nano-clay, carbon nanotube, and nano-silica for improvement of mechanical properties of composite structures.In this paper, an extensive literature review has been discussed regarding influence of various material and geometrical parameters on mechanical properties of sandwich composite structure. Initially, influence of various fiber reinforcement and nano-fillers on mechanical properties are discussed. Then, deformation behavior and mechanical properties of honeycomb core is elaborated.Further, influence of temperature variation on composite structure is discussed. Moreover, crucial insights on reviewed literature are presented and future advancements in the field of sandwich composite structure are discussed.

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Section: Literature Reviewmentioning

confidence: 99%

State of the art review on mechanical properties of sandwich composite structures

Patekar

Kale

2022

Polymer Composites

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“…[25] Another study aimed to improve the bending performance of re-entrant lattice structures, and it discovered that modified re-entrant cores outperform traditional re-entrant structures because of their flat plateau area under the force-displacement curve. [26] Internal filling is an efficient solution for improving the mechanical characteristics of cellular structures. [27] With the purpose of keeping the lightweight characteristics of thin-walled and sandwich structures, metallic and polymeric foams that are lowdensity fillers are implemented as suitable reinforcing filler materials.…”

Section: Introductionmentioning

confidence: 99%

“…[ 25 ] Another study aimed to improve the bending performance of re‐entrant lattice structures, and it discovered that modified re‐entrant cores outperform traditional re‐entrant structures because of their flat plateau area under the force–displacement curve. [ 26 ]…”

Section: Introductionmentioning

confidence: 99%

Three‐Point Bending Behavior of Foam‐Filled Conventional and Auxetic 3D‐Printed Honeycombs

Montazeri,

Bahmanpour,

Safarabadi

2023

Adv Eng Mater

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Cellular hexagonal (conventional) and re‐entrant (auxetic) honeycombs are applicable in automotive, construction, and protective engineering. Auxetic structures own excellent energy absorption and flexural behavior due to their special deformation under loading. This work explores the performance of additively manufactured polylactic acid (PLA)‐ and thermoplastic polyurethane (TPU)‐based hexagonal and re‐entrant honeycombs under flexural loading via experimental three‐point bending (TPB) tests and finite‐element analysis (FEA). 3D‐printed conventional and auxetic cellular structures are filled with polyurethane (PU) foam and their energy absorption capacity and flexural modulus are compared with hollow structures. The results reveal that TPU‐based structures’ energy absorption capacity and flexural modulus improve significantly, whereas the PLA‐based structures’ performance deteriorates when filled with PU foam. Moreover, re‐entrant honeycombs are better reinforced with foam in comparison to the hexagonal honeycombs, as the re‐entrant's unit cell is more spacious than the hexagonal unit cell. Finally, parametric studies are performed via FEA to investigate the influence of geometric parameters of structures and flexural loading setup on the performance of the honeycombs, showing that structures with thicker struts and higher cell angle can act stiffer under TPB. The outcomes of this research indicate the promising performance of foam‐filled TPU‐based auxetic structures.

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“…[ 35 ] Additionally, the flexural bending properties of such 3D printed auxetic sandwich structures have been studied, focusing on the energy absorption capacity of re‐entrant structures. [ 36 ] However, these 3D structures exhibit only in‐plane auxeticity (i.e., no NPR effect in the out‐of‐plane direction). Another classical 3D re‐entrant lattice auxetic structure is a combination of two 2D re‐entrant structural components (see Figure B), and their predicted properties can be validated via physical experimentation.…”

Section: Introductionmentioning

confidence: 99%

Study of Mechanical Properties of a New 3D Re‐Entrant Lattice Auxetic Structure Under Bending

et al. 2023

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Herein, the mechanical behaviors of a new 3D re‐entrant lattice auxetic structure under bending are investigated. When a classical 3D re‐entrant lattice auxetic structure is subjected to uniaxial loading, only one 2D structural component can sustain the load, which limits the capability of the auxetic structure. By changing the connection mode of 2D components, a new 3D re‐entrant lattice auxetic structure that can exhibit both in‐ and out‐of‐plane negative Poisson's ratios is proposed. To investigate the bending response of the new structure, specimens with three different design parameters are additively manufactured, and their mechanical properties are studied with the four‐point bending test and finite element analysis. Compared to the classical 3D re‐entrant lattice structure, the new 3D re‐entrant lattice structure exhibits lower initial peak stress and higher energy absorption capacity. The underlying mechanism may be closely associated with the unique deformation pattern of auxetic structures under bending. The new re‐entrant auxetic structure expands the design space of 3D auxetic structures, especially for energy absorption and protection in impact scenarios.

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Experimental and numerical analysis of the bending behavior of 3D printed modified auxetic sandwich structures

Cited by 21 publications

References 18 publications

State of the art review on mechanical properties of sandwich composite structures

State of the art review on mechanical properties of sandwich composite structures

Three‐Point Bending Behavior of Foam‐Filled Conventional and Auxetic 3D‐Printed Honeycombs

Study of Mechanical Properties of a New 3D Re‐Entrant Lattice Auxetic Structure Under Bending

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