Failure mechanisms of coiling fibers with sacrificial bonds made by instability-assisted fused deposition modeling

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

doi:10.1039/c8sm01589a

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…In our notched PDMS-alternating fiber composite, the sacrificial bonds break and voids form in a wide region between the clamps ahead of the crack tip, which is equivalent to intrinsic toughening Once the crack propagates, the fiber behind the crack tip is unloaded due to the exposing of the fiber loop. As fiber loop continues to unfold, the large-scale plastic deformation [30] along the fiber increases the energy dissipation behind the crack tip, which is equivalent to extrinsic toughening [44]. Even though the energy dissipation zone seems larger in our composite compared to the strip shape zone in tough elastomers with molecular sacrificial bonds, the volume fraction of sacrificial bonds in our composite is believed to be much lower than that in tough elastomers.…”

Section: Mechanical Testingmentioning

confidence: 84%

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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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Section: Mechanical Testingmentioning

confidence: 84%

“…After the bond breaking, the hidden length, i.e., the fiber loop, is released and unfolded. The unfolding of hidden lengths leads to large-scale plastic deformation along the fiber [30].…”

Section: Introductionmentioning

confidence: 99%

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

Zou¹,

Therriault²,

Gosselin³

2021

Extreme Mechanics Letters

Self Cite

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“…Similar to the rupture of sacrificial bonds in protein-based materials, such as spider silk, a properly designed sacrificial structure causes, upon the application of an external load, the unravelling of a hidden length, which is accompanied by an even significant release of energy, which sums up to the energy dissipated by the microfiber in normal condition, under loading, with a consequent increase of its toughness modulus [13]. The amount of the achievable toughness enhancement strongly depends on the design of the sacrificial structure, which can take the shape of intriguing topological, smart elements, such as loops or knots [14], as reported in past [15][16][17] and more recent [18,19] studies.…”

Section: Introductionmentioning

confidence: 96%

An insight into the toughness modulus enhancement of high-performance knotted microfibers through the correspondence analysis

Berardo¹,

Pantano²,

Pugno³

2021

Eng. Res. Express

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A variety of applications, spanning from structural or biomedical engineering to flexible electronics, require the development of materials able to withstand high load and, at the same time, accommodate high strain before failure. While strength and toughness are often self-excluding properties in man-made materials, they can be efficiently combined by nature, which provides source of inspiration for novel materials design. Herein this paper, we pursue a bio-inspired approach, based on the introduction of a mechanical sink, such as a running knot, to improve the toughness modulus of high-performance polymeric microfibres. These are then enriched with additional smart features, such as a viscoelastic coating, surface roughening or a combination of those, to amplify the beneficial effect of the knot introduction. The role played by all such features on the mechanical performances of the prepared fibre samples, namely load at failure and toughness modulus increase, is then evaluated through a statistical technique, known as correspondence analysis (CA). While this exploratory analysis is widely adopted in biology, ecology, neuroscience or genetics, applications in structural or mechanical engineering are still rare. Here, we show that CA can be a powerful tool for the design of materials provided with enhanced toughness without losing strength.

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An insight into additive manufacturing of fiber reinforced polymer composite

Zindani

Kumar

2019

International Journal of Lightweight Materials and Manufacture

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Failure mechanisms of coiling fibers with sacrificial bonds made by instability-assisted fused deposition modeling

Abstract: The nature of bond breaking and the loop unfolding process is revealed in microstructured coiling fibers with sacrificial bonds.

Cited by 5 publications

References 22 publications

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

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

An insight into the toughness modulus enhancement of high-performance knotted microfibers through the correspondence analysis

An insight into additive manufacturing of fiber reinforced polymer composite

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