What's Inside the Box? – Length‐Scales that Govern Fracture Processes of Polymer Fibers

Giesa, Tristan; Pugno, Nicola; Wong, Joyce Y.; Kaplan, David L.; Buehler, Markus J.

doi:10.1002/adma.201303323

Cited by 40 publications

(54 citation statements)

References 71 publications

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“…Note that we assume there are no defects in the original stress-free structure, and we might overestimate the elastic limit of 1 in the simulations. 28 We noted in our previous experiments 12 that the cocrystal looses the methanol solvent molecules from the lattice upon heating at above 333 K (60 1C) for about 10 minutes. Surprisingly, the dried cocrystal, 1 (dry), did not show any elastic property but broke easily under the applied stress in the experiment.…”

Section: View Article Onlinementioning

confidence: 98%

Molecular mechanics of elastic and bendable caffeine co-crystals

Chen

Ghosh

Reddy

et al. 2014

Phys. Chem. Chem. Phys.

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Complementing recent experimental results, here we report a computational study of remarkably flexible, elastically bendable caffeine cocrystals (cocrystal solvate 1), formed from caffeine (CAF), 4-chloro-3-nitrobenzoic acid (CNB), and methanol, and compare with its unsolvated brittle form, 1 (dry). We show that 1 is able to maintain stable cocrystal structures at temperatures between 100 K and 400 K. The tensile and compressive Young's modulus of 1 are close to ~10 GPa. The ultimate strength is more than 600 MPa in tensile and 400 MPa in compressive at temperature of 100 K. The simulation results of the structural and mechanical properties of 1 are in good agreement with our previous experimental work. Notably, before the ultimate tensile stress, the stress-to-strain curves of 1 show linear behavior, but 1 (dry) show nonlinear behavior. This study might explain the remarkable elasticity of 1 and is relevant to the design of high-performance organic materials with excellent self-healing or efficient stress dissipating properties.

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Section: View Article Onlinementioning

confidence: 98%

Molecular mechanics of elastic and bendable caffeine co-crystals

Chen

Ghosh

Reddy

et al. 2014

Phys. Chem. Chem. Phys.

Self Cite

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“…This was a precautionary step in an attempt to reduce the amount of imperfections during the extrusion process caused by the presence of moisture within the barrel [16]. As the polymers were drying the extruder was purged with polypropylene in order to remove any remaining polymer residue.…”

Section: Methodsmentioning

confidence: 99%

Extruded Monofilament and Multifilament Thermoplastic Stitching Yarns

McGarrigle

Rodgers

McIlhagger

et al. 2017

Fibers

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Carbon fibre reinforced polymer composites offer significant improvement in overall material strength to weight, when compared with metals traditionally used in engineering. As a result, they are replacing metals where overall weight is a significant consideration, such as in the aerospace and automotive industries. However, due to their laminate structure, delamination is a prime concern. Through-thickness stitching has been shown to be a relatively simple method of improving resistance to delamination. In this paper, monofilament and multifilament fibres of a similar overall diameter were characterised and their properties compared for their suitability as stitching yarns. Dissimilar to other published works which rely on commercially available materials, such as polyparaphenylene terephthalamide, criteria were produced on the required properties and two potentially promising polymers were selected for extrusion. It was found that although the multifilament fibres had a greater ultimate tensile strength, they began to yield at a lower force than their monofilament equivalent.

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“…The sudden accidental rupture happens in brittle fibers is of great concern for practical applications [1]. Ductile and damage-tolerant fibers (DDTFs), hence, are desired in many fields, such as aerospace engineering, civil engineering, and biomedical engineering [2][3][4]. DDTFs have a strong ability to sustain the main structure in the defect area safely before catastrophic damage happens [2].…”

Section: Introductionmentioning

confidence: 99%

Nanofibril Organization in Silk Fiber as Inspiration for Ductile and Damage-Tolerant Fiber Design

Lin

Zhang

et al. 2019

Adv. Fiber Mater.

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Ductile and damage-tolerant fibers (DDTFs) are desired in aerospace engineering, mechanical engineering, and biomedical engineering because of their ability to prevent the catastrophic sudden structural/mechanical failure. However, in practice, design and fabrication of DDTFs remain a major challenge due to finite fiber size and limited processing techniques. In this regard, animal silks can provide inspirations. They are hierarchically structured protein fibers with an elegant trade-off of mechanical strength, extensibility and damage tolerance, making them one of the toughest materials known. In this article, we confirmed that nanofibril organization could improve the ductility and damage-tolerance of silk fibers through restricted fibril shearing, controlled slippage and cleavage. Inspired by these strategies, we further established a rational strategy to produce polyamide DDTFs by combining electrospinning and yarn-spinning techniques. The resultant polymeric DDTFs show a silklike fracture resistance behavior, indicating potential applications in smart textile, biomedicine, and mechanical engineering.

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What's Inside the Box? – Length‐Scales that Govern Fracture Processes of Polymer Fibers

Cited by 40 publications

References 71 publications

Molecular mechanics of elastic and bendable caffeine co-crystals

Molecular mechanics of elastic and bendable caffeine co-crystals

Extruded Monofilament and Multifilament Thermoplastic Stitching Yarns

Nanofibril Organization in Silk Fiber as Inspiration for Ductile and Damage-Tolerant Fiber Design

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