Cargando…

Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites

Weld lines are a common defect generated in injection molding, which apparently affects the performance of final products, but the available reports on carbon fiber-reinforced thermoplastics are still rather few. In this study, the effects of injection temperature, injection pressure, and fiber cont...

Descripción completa

Detalles Bibliográficos
Autores principales: Wang, Xianpeng, Bao, Zuguo, Gao, Donglin, Huang, Shiyao, Huang, Li, Chen, Qiuren, Zhao, Hailong, Han, Weijian, Xu, Yahong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10255623/
https://www.ncbi.nlm.nih.gov/pubmed/37299275
http://dx.doi.org/10.3390/polym15112476
_version_ 1785056916879179776
author Wang, Xianpeng
Bao, Zuguo
Gao, Donglin
Huang, Shiyao
Huang, Li
Chen, Qiuren
Zhao, Hailong
Han, Weijian
Xu, Yahong
author_facet Wang, Xianpeng
Bao, Zuguo
Gao, Donglin
Huang, Shiyao
Huang, Li
Chen, Qiuren
Zhao, Hailong
Han, Weijian
Xu, Yahong
author_sort Wang, Xianpeng
collection PubMed
description Weld lines are a common defect generated in injection molding, which apparently affects the performance of final products, but the available reports on carbon fiber-reinforced thermoplastics are still rather few. In this study, the effects of injection temperature, injection pressure, and fiber content on the mechanical properties of weld lines were studied for carbon fiber-reinforced nylon (PA-CF) composites. The weld line coefficient was also calculated by comparing specimens with and without weld lines. The tensile and flexural properties of PA-CF composites significantly increased with the rise of fiber content for specimens without weld lines, while injection temperature and pressure demonstrated slight influences on mechanical properties. However, the existence of weld lines had negative influences on the mechanical properties of PA-CF composites due to poor fiber orientation in weld line regions. The weld line coefficient of PA-CF composites decreased as fiber content increased, indicating that the damage of weld lines to mechanical properties increased. The microstructure analysis showed that there were a large number of fibers distributed vertically to flow direction in weld lines regions, which could not play a reinforcing role. In addition, increasing injection temperature and pressure facilitated fiber orientation, which improved the mechanical properties of composites with low fiber content, while weakening composites with high fiber content instead. This article provides practical information for product design containing weld lines, which helps to optimize the forming process and formula design of PA-CF composites with weld lines.
format Online
Article
Text
id pubmed-10255623
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-102556232023-06-10 Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites Wang, Xianpeng Bao, Zuguo Gao, Donglin Huang, Shiyao Huang, Li Chen, Qiuren Zhao, Hailong Han, Weijian Xu, Yahong Polymers (Basel) Article Weld lines are a common defect generated in injection molding, which apparently affects the performance of final products, but the available reports on carbon fiber-reinforced thermoplastics are still rather few. In this study, the effects of injection temperature, injection pressure, and fiber content on the mechanical properties of weld lines were studied for carbon fiber-reinforced nylon (PA-CF) composites. The weld line coefficient was also calculated by comparing specimens with and without weld lines. The tensile and flexural properties of PA-CF composites significantly increased with the rise of fiber content for specimens without weld lines, while injection temperature and pressure demonstrated slight influences on mechanical properties. However, the existence of weld lines had negative influences on the mechanical properties of PA-CF composites due to poor fiber orientation in weld line regions. The weld line coefficient of PA-CF composites decreased as fiber content increased, indicating that the damage of weld lines to mechanical properties increased. The microstructure analysis showed that there were a large number of fibers distributed vertically to flow direction in weld lines regions, which could not play a reinforcing role. In addition, increasing injection temperature and pressure facilitated fiber orientation, which improved the mechanical properties of composites with low fiber content, while weakening composites with high fiber content instead. This article provides practical information for product design containing weld lines, which helps to optimize the forming process and formula design of PA-CF composites with weld lines. MDPI 2023-05-27 /pmc/articles/PMC10255623/ /pubmed/37299275 http://dx.doi.org/10.3390/polym15112476 Text en © 2023 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
Wang, Xianpeng
Bao, Zuguo
Gao, Donglin
Huang, Shiyao
Huang, Li
Chen, Qiuren
Zhao, Hailong
Han, Weijian
Xu, Yahong
Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites
title Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites
title_full Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites
title_fullStr Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites
title_full_unstemmed Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites
title_short Mechanical Properties of Weld Lines in Injection-Molded Carbon Fiber-Reinforced Nylon (PA-CF) Composites
title_sort mechanical properties of weld lines in injection-molded carbon fiber-reinforced nylon (pa-cf) composites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10255623/
https://www.ncbi.nlm.nih.gov/pubmed/37299275
http://dx.doi.org/10.3390/polym15112476
work_keys_str_mv AT wangxianpeng mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT baozuguo mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT gaodonglin mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT huangshiyao mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT huangli mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT chenqiuren mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT zhaohailong mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT hanweijian mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites
AT xuyahong mechanicalpropertiesofweldlinesininjectionmoldedcarbonfiberreinforcednylonpacfcomposites