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Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

Sheep wool is an eco-friendly, renewable, and totally recyclable material increasingly used in textiles, filters, insulation, and building materials. Recently, wool fibers have become good alternatives for reinforcement of polymer composites and filaments for 3D printing. Wool fibers are susceptible...

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Autores principales: Starkova, Olesja, Sabalina, Alisa, Voikiva, Vanda, Osite, Agnese
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9269294/
https://www.ncbi.nlm.nih.gov/pubmed/35808696
http://dx.doi.org/10.3390/polym14132651
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author Starkova, Olesja
Sabalina, Alisa
Voikiva, Vanda
Osite, Agnese
author_facet Starkova, Olesja
Sabalina, Alisa
Voikiva, Vanda
Osite, Agnese
author_sort Starkova, Olesja
collection PubMed
description Sheep wool is an eco-friendly, renewable, and totally recyclable material increasingly used in textiles, filters, insulation, and building materials. Recently, wool fibers have become good alternatives for reinforcement of polymer composites and filaments for 3D printing. Wool fibers are susceptible to environmental degradation that could shorten their lifetime and limit applications. This study reports on the mechanical properties of sheep wool fibers under the impact of humid air and UV irradiation. The results of single fiber tensile tests showed a noticeable gauge length effect on the fibers’ strength and failure strain. Long (50 mm) fibers possessed about 40% lower characteristics than short (10 mm) fibers. Environmental aging decreased the elastic modulus and strength of the fibers. Moisture-saturated fibers possessed up to 43% lower characteristics, while UV aging resulted in up to a twofold reduction of the strength. The most severe degradation effect is observed under the coupled influence of UVs and moisture. The two-parameter Weibull distribution was applied for the fiber strength and failure strain statistical assessment. The model well predicted the gauge length effects. Moisture-saturated and UV-aged fibers were characterized by less extensive strength dependences on the fiber length. The strength and failure strain distributions of aged fibers were horizontally shifted to lower values. The results will contribute to be reliable predictions of the environmental durability of sheep wool fibers and will extend their use in technical applications.
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spelling pubmed-92692942022-07-09 Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers Starkova, Olesja Sabalina, Alisa Voikiva, Vanda Osite, Agnese Polymers (Basel) Article Sheep wool is an eco-friendly, renewable, and totally recyclable material increasingly used in textiles, filters, insulation, and building materials. Recently, wool fibers have become good alternatives for reinforcement of polymer composites and filaments for 3D printing. Wool fibers are susceptible to environmental degradation that could shorten their lifetime and limit applications. This study reports on the mechanical properties of sheep wool fibers under the impact of humid air and UV irradiation. The results of single fiber tensile tests showed a noticeable gauge length effect on the fibers’ strength and failure strain. Long (50 mm) fibers possessed about 40% lower characteristics than short (10 mm) fibers. Environmental aging decreased the elastic modulus and strength of the fibers. Moisture-saturated fibers possessed up to 43% lower characteristics, while UV aging resulted in up to a twofold reduction of the strength. The most severe degradation effect is observed under the coupled influence of UVs and moisture. The two-parameter Weibull distribution was applied for the fiber strength and failure strain statistical assessment. The model well predicted the gauge length effects. Moisture-saturated and UV-aged fibers were characterized by less extensive strength dependences on the fiber length. The strength and failure strain distributions of aged fibers were horizontally shifted to lower values. The results will contribute to be reliable predictions of the environmental durability of sheep wool fibers and will extend their use in technical applications. MDPI 2022-06-29 /pmc/articles/PMC9269294/ /pubmed/35808696 http://dx.doi.org/10.3390/polym14132651 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Starkova, Olesja
Sabalina, Alisa
Voikiva, Vanda
Osite, Agnese
Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers
title Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers
title_full Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers
title_fullStr Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers
title_full_unstemmed Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers
title_short Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers
title_sort environmental effects on strength and failure strain distributions of sheep wool fibers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9269294/
https://www.ncbi.nlm.nih.gov/pubmed/35808696
http://dx.doi.org/10.3390/polym14132651
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