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Quantitative detection of damage in soft materials using mechano-fluorescence

Abstract : Engineering applications of soft materials, such as prosthetic ligaments, are limited by crack propagation initiated by a defect. A better understanding of dissipative mechanism at the crack tip will be invaluable to guide materials chemists to design and develop better soft and tough materials.We developed a method to visualize molecular chains scission based on mechano-fluorescence: fluorescence activation upon mechanically triggered bond scission. We mapped molecular damage in 3D and at high magnification by confocal microscopy. Chemistry, mechanics and physics were associated to give our multi scale approach. With the help of a calibration curve we directly quantified and mapped chains scission inside a series of model elastomers, from brittle to tough. Results obtained from this method challenge the actual molecular picture of fracture in soft material. Indeed, we proved that chain scission in elastomers occurs over a thickness of tens of microns around the crack plane and depends on strain rate and temperature as they are coupled to viscoelasticity. Theorists in physics and mechanics can use this solid experimental foundation to construct better molecular models of fracture.
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https://pastel.archives-ouvertes.fr/tel-02864025
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Submitted on : Wednesday, June 10, 2020 - 6:26:16 PM
Last modification on : Saturday, September 26, 2020 - 11:44:11 PM

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  • HAL Id : tel-02864025, version 1

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Juliette Slootman. Quantitative detection of damage in soft materials using mechano-fluorescence. Material chemistry. Université Paris sciences et lettres, 2019. English. ⟨NNT : 2019PSLET019⟩. ⟨tel-02864025⟩

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