Out-of-plane load-bearing and mechanical energy absorption properties of flexible density-graded TPU honeycombs

Anni, Ibnaj Anamika; Uddin, Kazi Zahir; Pagliocca, Nicholas; Singh, Nand K.; Rahman, Oyindamola; Youssef, George; Koohbor, Behrad

doi:10.1016/j.jcomc.2022.100284

Cited by 8 publications

(9 citation statements)

References 30 publications

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“…[ 43 ] When the density is varied along one axis, it will produce a cell‐density gradient, which has been the topic of research in the materials domain with demonstrated improvements in the mechanical performance of the structure. [ 44,45 ]…”

Section: Resultsmentioning

confidence: 99%

“…[43] When the density is varied along one axis, it will produce a cell-density gradient, which has been the topic of research in the materials domain with demonstrated improvements in the mechanical performance of the structure. [44,45] At local (meso) scale, there is a strain-dependent variation in mechanical compliance that is induced by the rotation of the solid portions of the unit cells. Specifically, unit cells with a high AR and low IS experience large cell rotations, while those with a low AR and high IS experience insignificant rotation.…”

Section: Multiscale Mechanical Response Of Uniform Flexible Sheetsmentioning

confidence: 99%

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Modular Soft Robotic Actuators from Flexible Perforated Sheets

2023

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Soft robotic actuators can be designed to achieve complex and tailored motions while simultaneously leveraging their compliance to interact with complex and often delicate environments. Mechanical metamaterials reveal a route to customizable deformations, force exertion, and mechanical energy efficiency attainable by careful arrangement of local geometric features. Herein, modular soft robotic actuators are developed from soft elastomers and flexible thermoplastic sheets of various unit cell designs. The efforts are focused on center‐symmetric perforated sheets, which are formed into flexible cylindrical skins that surround the soft inflatable actuators. The results demonstrate the influence of perforation geometry on the spatial stiffness of the reinforcement structure and the proposed actuators’ response through several investigations. It is demonstrated that the free‐boundary displacement, maximal force exertion, and mechanical energy efficiency of extensile actuators are dependent on a change of deformation mode in the mesostructure. The spatial stiffness concept is extended to develop soft robotic actuators that can bend, twist, and perform hybrid motions, such as simultaneous bending and twisting. Multisegment soft robotic arms are also developed from the aforementioned actuators. Investigations in this study provide a step toward the development of highly customizable and programmable soft robotic actuators for various applications.

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Section: Resultsmentioning

confidence: 99%

Section: Multiscale Mechanical Response Of Uniform Flexible Sheetsmentioning

confidence: 99%

Modular Soft Robotic Actuators from Flexible Perforated Sheets

2023

Self Cite

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“…For experimental studies, the energy absorption metrics are often described in terms of the area below the stress-strain curve, which mostly depends on both the strength and deformability. 17 Anni et al 81 manufactured uniform density and graded honeycomb structures from flexible TPU via the same 3D printing methods. The density graded samples were also produced with 2-stage, 3-stage and 5-stage gradients.…”

Section: Composite Foamsmentioning

confidence: 99%

Density graded polymer composite foams

Tan

Rodrigue

2022

Cellular Polymers

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This article reviews the main developments associated with density graded polymer composite foams. After a short introduction, a discussion is made on both density graded polymer-based composites and foams separately to better understand the challenges when both structures are combined together to produce composite foams. In all cases, the basic concepts, fabrication methods, main properties and general applications are presented. Opening for future works are also presented to conclude.

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“…As an example, the former includes the bioinspired honeycomb structures that are widely implemented as a lightweight core in a sandwich construction. [ 1 ] 3D lattice materials compose of stochastic foams and periodic structures, as the former highly imitates the anisotropic nature of the human bone which makes it suitable for bone implants. [ 2 ] Unlike the stochastic foams, the isotropy of periodic lattice materials is highly directional dependent.…”

Section: Introductionmentioning

confidence: 99%

Recent Advancements in Design Optimization of Lattice‐Structured Materials

et al. 2023

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Metamaterials, also known as lattice‐structured materials, imitate the multifunctionality of natural architects as tailoring their physical properties is associated with manipulating their microstructure. As the recent evolution of additive manufacturing enables the creation of intricate geometries with minimal material wastage, improving the design to manufacturing cycle of lattice structured materials has become one of the trending research areas. Triply periodic minimal surface (TPMS) and plate lattice materials are renowned for their exceptional mechanical behavior in lightweight applications. Apparently, several types of design optimization strategies are explored to maximize their performance for better biocompatibility and mechanical loading resistance. Some of these strategies include functional gradation and multimorphology hybridization that are comprehensively described in this review. Their benefits and drawbacks are highlighted with a focus on TPMS and plate lattice materials. The review anticipates the utilization of automated design exploration methods (i.e., topology optimization and data‐driven methods) to further enhance the design optimization procedure of lattice structured materials.

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Out-of-plane load-bearing and mechanical energy absorption properties of flexible density-graded TPU honeycombs

Cited by 8 publications

References 30 publications

Modular Soft Robotic Actuators from Flexible Perforated Sheets

Modular Soft Robotic Actuators from Flexible Perforated Sheets

Density graded polymer composite foams

Recent Advancements in Design Optimization of Lattice‐Structured Materials

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