The Experts below are selected from a list of 7209 Experts worldwide ranked by ideXlab platform
M C Lafariefrenot - One of the best experts on this subject based on the ideXlab platform.
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assessment of thermo oxidative induced chemical strain by inverse analysis of shrinkage profiles in unidirectional composites
Composite Structures, 2016Co-Authors: Marco Gigliotti, M Minervino, M C LafariefrenotAbstract:Abstract The present paper focuses on the assessment of thermo-oxidative induced chemical strain in HTS/TACTIX carbon/epoxy Organic Matrix Composites for High Temperature Applications, by inverse analysis of shrinkage profiles in unidirectional composites. First, measurement of matrix shrinkage in composites surface is carried out by Interferometric Microscopy for virgin samples (initial state) and for samples aged under oxygen pressure and air at atmospheric pressure: then, a model based on thermodynamics with Internal Variables and ABAQUS numerical simulations carried out on unidirectional composite realistic samples are employed for inverse identification of thermo-oxidative induced chemical strain and its evolution during conditioning. The identification is performed successfully and validated against chemical shrinkage profiles developing in Pure Resin systems. The model is then used for calculating thermo-oxidative induced stresses related to chemical shrinkage inelastic strains and for the prediction of the observed fibre/matrix debonding scenario. A Rayleigh-Ritz method is also developed for rapid prediction of matrix shrinkage in composite materials.
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thermo oxidative induced shrinkage in organic matrix composites for high temperature applications effect of fibre arrangement and oxygen pressure
Composite Structures, 2016Co-Authors: Marco Gigliotti, M Minervino, M C LafariefrenotAbstract:Abstract The present paper focuses on thermo-oxidative induced chemical shrinkage in HTS/TACTIX carbon/epoxy Organic Matrix Composites for High Temperature Applications, providing an insight on the effect of the fibre arrangement and of the oxygen pressure as an accelerating parameter. In particular, measurement of matrix shrinkage in composites surface is carried out by Interferometric Microscopy for virgin samples (initial state) and for samples aged under oxygen pressure and air at atmospheric pressure: some discussion about the “structural” effect (arrangement of fibres, fibre volume fraction) on matrix shrinkage development of unidirectional composites is provided; a link between the measured surface matrix shrinkage and the evolution of the surface elastic indentation modulus measured in Pure Resin samples can be clearly established: moreover, it is shown that matrix shrinkage development in composites can be conveniently accelerated by the employment of oxygen pressure, as in Pure Resin systems.
Hao Bai - One of the best experts on this subject based on the ideXlab platform.
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a transparent skin inspired composite film with outstanding tear resistance based on flat silk cocoon
Advanced Materials, 2020Co-Authors: Weiwei Gao, Hao BaiAbstract:Flexible and transparent substrates play a fundamental role as a mechanical support in advanced electronic devices. However, commonly used polymer films, such as polydimethylsiloxane, show low tear resistance because of their crack sensitivity. Herein, inspired by the excellent mechanical robustness of the skin and its fibrous structure, an epoxy-Resin-based composite with a flat silk cocoon as a reinforcing fiber network is fabricated. With only 1 wt% of silk fiber, the tensile strength and modulus of the as-prepared composite film are considerably increased by 300% and 612% compared to those of Pure Resin, while still maintaining flexibility and transparency. More importantly, the composite shows remarkable tear resistance: without fracture after ≈30 000 tensile cycles. The potential application of such transparent composite films as mechanically robust substrates for flexible electronics is also demonstrated. In addition, this study represents a bioinspired strategy to construct high-performance functional composite materials.
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A Transparent, Skin‐Inspired Composite Film with Outstanding Tear Resistance Based on Flat Silk Cocoon
Advanced materials (Deerfield Beach Fla.), 2020Co-Authors: Weiwei Gao, Hao BaiAbstract:Flexible and transparent substrates play a fundamental role as a mechanical support in advanced electronic devices. However, commonly used polymer films, such as polydimethylsiloxane, show low tear resistance because of their crack sensitivity. Herein, inspired by the excellent mechanical robustness of the skin and its fibrous structure, an epoxy-Resin-based composite with a flat silk cocoon as a reinforcing fiber network is fabricated. With only 1 wt% of silk fiber, the tensile strength and modulus of the as-prepared composite film are considerably increased by 300% and 612% compared to those of Pure Resin, while still maintaining flexibility and transparency. More importantly, the composite shows remarkable tear resistance: without fracture after ≈30 000 tensile cycles. The potential application of such transparent composite films as mechanically robust substrates for flexible electronics is also demonstrated. In addition, this study represents a bioinspired strategy to construct high-performance functional composite materials.
Marco Gigliotti - One of the best experts on this subject based on the ideXlab platform.
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assessment of thermo oxidative induced chemical strain by inverse analysis of shrinkage profiles in unidirectional composites
Composite Structures, 2016Co-Authors: Marco Gigliotti, M Minervino, M C LafariefrenotAbstract:Abstract The present paper focuses on the assessment of thermo-oxidative induced chemical strain in HTS/TACTIX carbon/epoxy Organic Matrix Composites for High Temperature Applications, by inverse analysis of shrinkage profiles in unidirectional composites. First, measurement of matrix shrinkage in composites surface is carried out by Interferometric Microscopy for virgin samples (initial state) and for samples aged under oxygen pressure and air at atmospheric pressure: then, a model based on thermodynamics with Internal Variables and ABAQUS numerical simulations carried out on unidirectional composite realistic samples are employed for inverse identification of thermo-oxidative induced chemical strain and its evolution during conditioning. The identification is performed successfully and validated against chemical shrinkage profiles developing in Pure Resin systems. The model is then used for calculating thermo-oxidative induced stresses related to chemical shrinkage inelastic strains and for the prediction of the observed fibre/matrix debonding scenario. A Rayleigh-Ritz method is also developed for rapid prediction of matrix shrinkage in composite materials.
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thermo oxidative induced shrinkage in organic matrix composites for high temperature applications effect of fibre arrangement and oxygen pressure
Composite Structures, 2016Co-Authors: Marco Gigliotti, M Minervino, M C LafariefrenotAbstract:Abstract The present paper focuses on thermo-oxidative induced chemical shrinkage in HTS/TACTIX carbon/epoxy Organic Matrix Composites for High Temperature Applications, providing an insight on the effect of the fibre arrangement and of the oxygen pressure as an accelerating parameter. In particular, measurement of matrix shrinkage in composites surface is carried out by Interferometric Microscopy for virgin samples (initial state) and for samples aged under oxygen pressure and air at atmospheric pressure: some discussion about the “structural” effect (arrangement of fibres, fibre volume fraction) on matrix shrinkage development of unidirectional composites is provided; a link between the measured surface matrix shrinkage and the evolution of the surface elastic indentation modulus measured in Pure Resin samples can be clearly established: moreover, it is shown that matrix shrinkage development in composites can be conveniently accelerated by the employment of oxygen pressure, as in Pure Resin systems.
M Minervino - One of the best experts on this subject based on the ideXlab platform.
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assessment of thermo oxidative induced chemical strain by inverse analysis of shrinkage profiles in unidirectional composites
Composite Structures, 2016Co-Authors: Marco Gigliotti, M Minervino, M C LafariefrenotAbstract:Abstract The present paper focuses on the assessment of thermo-oxidative induced chemical strain in HTS/TACTIX carbon/epoxy Organic Matrix Composites for High Temperature Applications, by inverse analysis of shrinkage profiles in unidirectional composites. First, measurement of matrix shrinkage in composites surface is carried out by Interferometric Microscopy for virgin samples (initial state) and for samples aged under oxygen pressure and air at atmospheric pressure: then, a model based on thermodynamics with Internal Variables and ABAQUS numerical simulations carried out on unidirectional composite realistic samples are employed for inverse identification of thermo-oxidative induced chemical strain and its evolution during conditioning. The identification is performed successfully and validated against chemical shrinkage profiles developing in Pure Resin systems. The model is then used for calculating thermo-oxidative induced stresses related to chemical shrinkage inelastic strains and for the prediction of the observed fibre/matrix debonding scenario. A Rayleigh-Ritz method is also developed for rapid prediction of matrix shrinkage in composite materials.
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thermo oxidative induced shrinkage in organic matrix composites for high temperature applications effect of fibre arrangement and oxygen pressure
Composite Structures, 2016Co-Authors: Marco Gigliotti, M Minervino, M C LafariefrenotAbstract:Abstract The present paper focuses on thermo-oxidative induced chemical shrinkage in HTS/TACTIX carbon/epoxy Organic Matrix Composites for High Temperature Applications, providing an insight on the effect of the fibre arrangement and of the oxygen pressure as an accelerating parameter. In particular, measurement of matrix shrinkage in composites surface is carried out by Interferometric Microscopy for virgin samples (initial state) and for samples aged under oxygen pressure and air at atmospheric pressure: some discussion about the “structural” effect (arrangement of fibres, fibre volume fraction) on matrix shrinkage development of unidirectional composites is provided; a link between the measured surface matrix shrinkage and the evolution of the surface elastic indentation modulus measured in Pure Resin samples can be clearly established: moreover, it is shown that matrix shrinkage development in composites can be conveniently accelerated by the employment of oxygen pressure, as in Pure Resin systems.
Weiwei Gao - One of the best experts on this subject based on the ideXlab platform.
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a transparent skin inspired composite film with outstanding tear resistance based on flat silk cocoon
Advanced Materials, 2020Co-Authors: Weiwei Gao, Hao BaiAbstract:Flexible and transparent substrates play a fundamental role as a mechanical support in advanced electronic devices. However, commonly used polymer films, such as polydimethylsiloxane, show low tear resistance because of their crack sensitivity. Herein, inspired by the excellent mechanical robustness of the skin and its fibrous structure, an epoxy-Resin-based composite with a flat silk cocoon as a reinforcing fiber network is fabricated. With only 1 wt% of silk fiber, the tensile strength and modulus of the as-prepared composite film are considerably increased by 300% and 612% compared to those of Pure Resin, while still maintaining flexibility and transparency. More importantly, the composite shows remarkable tear resistance: without fracture after ≈30 000 tensile cycles. The potential application of such transparent composite films as mechanically robust substrates for flexible electronics is also demonstrated. In addition, this study represents a bioinspired strategy to construct high-performance functional composite materials.
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A Transparent, Skin‐Inspired Composite Film with Outstanding Tear Resistance Based on Flat Silk Cocoon
Advanced materials (Deerfield Beach Fla.), 2020Co-Authors: Weiwei Gao, Hao BaiAbstract:Flexible and transparent substrates play a fundamental role as a mechanical support in advanced electronic devices. However, commonly used polymer films, such as polydimethylsiloxane, show low tear resistance because of their crack sensitivity. Herein, inspired by the excellent mechanical robustness of the skin and its fibrous structure, an epoxy-Resin-based composite with a flat silk cocoon as a reinforcing fiber network is fabricated. With only 1 wt% of silk fiber, the tensile strength and modulus of the as-prepared composite film are considerably increased by 300% and 612% compared to those of Pure Resin, while still maintaining flexibility and transparency. More importantly, the composite shows remarkable tear resistance: without fracture after ≈30 000 tensile cycles. The potential application of such transparent composite films as mechanically robust substrates for flexible electronics is also demonstrated. In addition, this study represents a bioinspired strategy to construct high-performance functional composite materials.
