Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP Structures
Using thermoplastics as the matrix in carbon fiber-reinforced polymers (CFRP) offers the possibility to make use of welded joints, which results in weight savings compared to conventional joining methods using mechanical fasteners. In this paper, the resulting temperature distribution in the materia...
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doaj-5ad78c37d0594e45827991f4b1ff3bb92021-02-03T00:00:17ZengMDPI AGJournal of Composites Science2504-477X2021-02-015454510.3390/jcs5020045Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP StructuresLukas Nagel0Alexander Herwig1Carsten Schmidt2Peter Horst3Institute of Aircraft Design and Lightweight Structures, Technische Universität Braunschweig, Ottenbecker Damm 12, 21684 Stade, GermanyInstitute of Aircraft Design and Lightweight Structures, Technische Universität Braunschweig, Ottenbecker Damm 12, 21684 Stade, GermanyInstitute of Production Engineering and Machine Tools, Leibniz Universität Hannover, Ottenbecker Damm 12, 21684 Stade, GermanyInstitute of Aircraft Design and Lightweight Structures, Technische Universität Braunschweig, Ottenbecker Damm 12, 21684 Stade, GermanyUsing thermoplastics as the matrix in carbon fiber-reinforced polymers (CFRP) offers the possibility to make use of welded joints, which results in weight savings compared to conventional joining methods using mechanical fasteners. In this paper, the resulting temperature distribution in the material due to resistance welding is investigated by transient finite element (FE) simulations. To examine the effects on the component structure, a numerical modeling approach is created, which allows determining the residual stresses caused by the welding process. It is shown that the area of the structure, especially near the joining zone, is highly affected by the process, especially in terms of residual stresses. In particular, the stresses perpendicular to the fiber direction show failure relevant values up to a maximum of 221 MPa, which might lead to the formation of microcracks in the matrix. In turn, that is assumed to be critical in terms of the fatigue of welded composite structures. Thus, the suggested modeling approach provides residual stresses that can be used to determine their effects on the strength, structural stability, and fatigue of such composite structures. In a subsequent step, these findings could play an important role in the design process of thermoplastic composite structures.https://www.mdpi.com/2504-477X/5/2/45resistance weldingfinite element modelingresidual stressthermoplasticspolymer–matrix composites (PMCs)thermomechanical behavior |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lukas Nagel Alexander Herwig Carsten Schmidt Peter Horst |
spellingShingle |
Lukas Nagel Alexander Herwig Carsten Schmidt Peter Horst Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP Structures Journal of Composites Science resistance welding finite element modeling residual stress thermoplastics polymer–matrix composites (PMCs) thermomechanical behavior |
author_facet |
Lukas Nagel Alexander Herwig Carsten Schmidt Peter Horst |
author_sort |
Lukas Nagel |
title |
Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP Structures |
title_short |
Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP Structures |
title_full |
Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP Structures |
title_fullStr |
Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP Structures |
title_full_unstemmed |
Numerical Investigation of Residual Stresses in Welded Thermoplastic CFRP Structures |
title_sort |
numerical investigation of residual stresses in welded thermoplastic cfrp structures |
publisher |
MDPI AG |
series |
Journal of Composites Science |
issn |
2504-477X |
publishDate |
2021-02-01 |
description |
Using thermoplastics as the matrix in carbon fiber-reinforced polymers (CFRP) offers the possibility to make use of welded joints, which results in weight savings compared to conventional joining methods using mechanical fasteners. In this paper, the resulting temperature distribution in the material due to resistance welding is investigated by transient finite element (FE) simulations. To examine the effects on the component structure, a numerical modeling approach is created, which allows determining the residual stresses caused by the welding process. It is shown that the area of the structure, especially near the joining zone, is highly affected by the process, especially in terms of residual stresses. In particular, the stresses perpendicular to the fiber direction show failure relevant values up to a maximum of 221 MPa, which might lead to the formation of microcracks in the matrix. In turn, that is assumed to be critical in terms of the fatigue of welded composite structures. Thus, the suggested modeling approach provides residual stresses that can be used to determine their effects on the strength, structural stability, and fatigue of such composite structures. In a subsequent step, these findings could play an important role in the design process of thermoplastic composite structures. |
topic |
resistance welding finite element modeling residual stress thermoplastics polymer–matrix composites (PMCs) thermomechanical behavior |
url |
https://www.mdpi.com/2504-477X/5/2/45 |
work_keys_str_mv |
AT lukasnagel numericalinvestigationofresidualstressesinweldedthermoplasticcfrpstructures AT alexanderherwig numericalinvestigationofresidualstressesinweldedthermoplasticcfrpstructures AT carstenschmidt numericalinvestigationofresidualstressesinweldedthermoplasticcfrpstructures AT peterhorst numericalinvestigationofresidualstressesinweldedthermoplasticcfrpstructures |
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1724290396376268800 |