Spiderweb-Inspired, Transparent, Impact-Absorbing Composite

Zou, Shibo; Therriault, Daniel; Gosselin, Frédérick P.

doi:10.1016/j.xcrp.2020.100240

Cited by 16 publications

(12 citation statements)

References 57 publications

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“…23 LRC has already been exploited to fabricate porous structures. [24][25][26][27][28] Results in the literature indicate that LRC can realize stiffness changes of more than one order of magnitude. 24,28 .…”

Section: Introductionmentioning

confidence: 99%

3D printing of soft fluidic actuators with graded porosity

2022

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Section: Introductionmentioning

confidence: 99%

3D printing of soft fluidic actuators with graded porosity

2022

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“…A biological prototype of spider silk is shown in Figure 1 a. It is both elastic and rigid, and can be considered to be composed of two parts: a semi-amorphous domain and a nanocrystal [ 19 ]. When bio-inspired spider silk is stretched by force, the semi-amorphous domain part inside the bio-inspired spider silk becomes elastic, and the spiral part inside it is stretched by force.…”

Section: Resultsmentioning

confidence: 99%

“…Zou et al successfully designed a transparent composite material with super-impact resistance using the SBHL strategy. Zou et al’s biologically inspired spider webs are able to dissipate a significant amount of energy, as they absorb impact and seize the projectile like a natural spider web [ 19 ]. Qin et al created spider-web mimics composed of elastic thin filaments and investigated the mechanical response of the elastic web under a variety of loading conditions [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Bio-Inspired 4D Printing of Dynamic Spider Silks

Tian

Yang

et al. 2022

Polymers

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Spider silks exhibit excellent mechanical properties and have promising application prospects in engineering fields. Because natural spider silk fibers cannot be manufactured on a large scale, researchers have attempted to fabricate bio-inspired spider silks. However, the fabrication of bio-inspired spider silks with dynamically tunable mechanical properties and stimulation–response characteristics remains a challenge. Herein, the 4D printing of shape memory polyurethane is employed to produce dynamic bio-inspired spider silks. The bio-inspired spider silks have two types of energy-absorbing units that can be adjusted, one by means of 4D printing with predefined nodes, and the other through different stimulation methods to make the bio-inspired spider silks contract and undergo spiral deformation. The shape morphing behaviors of bio-inspired spider silks are programmed via pre-stress assemblies enabled by 4D printing. The energy-absorbing units of bio-inspired spider silks can be dynamically adjusted owing to stress release generated with the stimuli of temperature or humidity. Therefore, the mechanical properties of bio-inspired spider silks can be controlled to change dynamically. This can further help in developing applications of bio-inspired spider silks in engineering fields with dynamic changes of environment.

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“…LRC has already been exploited to fabricate porous structures 24,25,26,27,28 . Results in the literature indicate that LRC can realize stiffness changes of more than one order of magnitude 24,28 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it has been shown to be feasible to print different patterns by proper selection of process parameters. 25,26,28 Such an approach has been applied to AM processes extrude molten materials that solidify in the process, such as glass 25 and thermoplastics 27,28 . Although these initial results indicate that porous structures can be realized with LRC and AM, its application to soft robotics has, to the knowledge of the authors, not yet been explored.…”

Section: Introductionmentioning

confidence: 99%

Direct 3D Printing of Soft Fluidic Actuators with Graded Porosity

Willemstein¹,

Kooij²,

Sadeghi³

2022

Preprint

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New additive manufacturing methods are needed to realize more complex soft robots. One example is soft fluidic robotics, which exploits fluidic power and stiffness gradients. Porous structures are an interesting type for this approach, as they are flexible and allow for fluid transport. Within this work, the Infill-Foam (InFoam) is proposed to print structures with graded porosity by liquid rope coiling (LRC). By exploiting LRC, the InFoam method could exploit the repeatable coiling patterns to print structures. To this end, only the characterization of the relation between nozzle height and coil radius and the extruded length were necessary (at a fixed temperature). Then by adjusting the nozzle height and/or extrusion speed the porosity of the printed structure could be set. The InFoam method was demonstrated by printing porous structures using styrene-ethylene-butylene-styrene (SEBS) with porosities ranging from 46% to 89%. In compression tests, the cubes showed large changes in modulus (more than 200 times), density (-89% compared to bulk), and energy dissipation. The InFoam method combined coiling and normal plotting to realize a large range of porosity gradients. This grading was exploited to realize rectangular structures with varying deformation patterns, which included twisting, contraction, and bending. Furthermore, the InFoam method was shown to be capable of programming the behavior of bending actuators by varying the porosity. Both the output force and stroke showed correlations similar to those of the cubes. Thus, the InFoam method can fabricate and program the mechanical behavior of a soft fluidic (porous) actuator by grading porosity.

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Spiderweb-Inspired, Transparent, Impact-Absorbing Composite

Cited by 16 publications

References 57 publications

3D printing of soft fluidic actuators with graded porosity

3D printing of soft fluidic actuators with graded porosity

Bio-Inspired 4D Printing of Dynamic Spider Silks

Direct 3D Printing of Soft Fluidic Actuators with Graded Porosity

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