Spider Web-Inspired Transparent Impact-Absorbing Composite

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

doi:10.2139/ssrn.3667137

Cited by 1 publication

(8 citation statements)

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“…Due to the similar refractive indexes of the PC fiber and PDMS [26], the fiber is almost invisible inside PDMS when the specimen is at rest (see Fig. 2a i).…”

Section: Resultsmentioning

confidence: 99%

“…We first fixed VF at 1929.3 mm/min. Then we measured the volume flow rate correction factor C1 (0.82) and the fiber expansion factor C2 (1.09) experimentally [26]. The speed ratio ve/vm is proportional to the ratio of two independent g-code parameters LE/LD:…”

Section: Microstructured Fiber Printingmentioning

confidence: 99%

“…The energy dissipation can be further increased by introducing molecular-level sacrificial bonds into the matrix [22]. Recently, we demonstrated large inelastic deformation and high energy dissipation in elastomer composites under low-velocity impact [26] by combining the widely used elastomer PDMS and the microstructured thermoplastic fibers with sacrificial bonds and hidden lengths [27,28]. The microstructured fibers with sacrificial bonds and hidden lengths are made by instabilityassisted fused filament fabrication (IFFF) as shown in Fig.…”

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confidence: 99%

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confidence: 99%

“…Embedding the microstructured fibers in PDMS produces a transparent elastomer composite with graceful failure and superior damage tolerance [26]. Although large inelastic deformation and high energy dissipation were demonstrated in the elastomer composite under impact loading [26], the composite's fracture mechanism and damage tolerance under static loading remain to be investigated. In this work, we perform uniaxial tensile tests of the alternating fiber composite specimens in the pure shear geometry [31] with and without a precrack to understand the interactions between crack propagation, bond breaking and fiber unfolding.…”

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Toughening elastomers via microstructured thermoplastic fibers with sacrificial bonds and hidden lengths

Zou¹,

Therriault²,

Gosselin³

2021

Extreme Mechanics Letters

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Soft materials capable of large inelastic deformation play an essential role in highperformance nacre-inspired architectured materials with a combination of stiffness, strength and toughness. The rigid "building blocks" made from glass or ceramic in these architectured materials lack inelastic deformation capabilities and thus rely on the soft interface material that bonds together these building blocks to achieve large deformation and high toughness. Here, we demonstrate the concept of achieving large inelastic deformation and high energy dissipation in soft materials by embedding microstructured thermoplastic fibers with sacrificial bonds and hidden lengths in a widely used elastomer. The microstructured fibers are fabricated by harnessing the fluid-mechanical instability of a molten polycarbonate (PC) thread on a commercial 3D printer. Polydimethylsiloxane (PDMS) resin is infiltrated around the fibers, creating a soft composite after curing. The failure mechanism and damage tolerance of the composite are analyzed through fracture tests. The high energy dissipation is found to be related to the multiple fracture events of both the sacrificial bonds and elastomer matrix. Combining the microstructured fibers and straight fibers in the elastomer composite results in a ~ 17 times increase in stiffness and a ~ 7 times increase in total energy to failure compared to the neat elastomer. Our findings in applying the

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“…Due to the similar refractive indexes of the PC fiber and PDMS [26], the fiber is almost invisible inside PDMS when the specimen is at rest (see Fig. 2a i).…”

Section: Resultsmentioning

confidence: 99%

Section: Microstructured Fiber Printingmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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