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Influence of Spatially Distributed Out-of-Plane CFRP Fiber Waviness on the Estimation of Knock-Down Factors Based on Stochastic Numerical Analysis

Schuster, Andreas and Degenhardt, Richard and Willberg, Christian and Wille, Tobias (2022) Influence of Spatially Distributed Out-of-Plane CFRP Fiber Waviness on the Estimation of Knock-Down Factors Based on Stochastic Numerical Analysis. Journal of Composites Science, 6 (12). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/jcs6120353. ISSN 2504-477X.

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Official URL: https://www.mdpi.com/2504-477X/6/12/353

Abstract

The presence of waviness defects in CFRP materials due to fiber undulation affects the structural performance of composite structures. Hence, without a reliable assessment of the resulting material properties, the full weight-saving potential cannot be exploited. Within the paper, a probabilistic numerical approach for improved estimation of material properties based on spatially distributed fiber waviness is presented. It makes use of a homogenization approach to derive viable knock-down factors for the different plies on the laminate level for reference material and is demonstrated for a representative tension loadcase. For the stochastic analysis, a random field is selected which describes the complex inner geometry of the plies in the laminate model and is numerically discretized by the Karhunen–Loeve expansion methods to fit into an FE model for the strength analysis. Conducted analysis studies reveal a substantial influence of randomly distributed waviness defects on the derived knock-down factors. Based on a topological analysis of the waviness fields, the reduction of the material properties was found to be weakly negatively correlated related to simple geometrical properties such as maximum amplitudes of the waviness field, which justifies the need for further subsequent sensitivity studies.

Item URL in elib:https://elib.dlr.de/190631/
Document Type:Article
Title:Influence of Spatially Distributed Out-of-Plane CFRP Fiber Waviness on the Estimation of Knock-Down Factors Based on Stochastic Numerical Analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schuster, AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-9919-9640UNSPECIFIED
Degenhardt, RichardUNSPECIFIEDhttps://orcid.org/0000-0002-9766-9418UNSPECIFIED
Willberg, ChristianUNSPECIFIEDhttps://orcid.org/0000-0003-2433-9183UNSPECIFIED
Wille, TobiasUNSPECIFIEDhttps://orcid.org/0009-0009-5777-2822UNSPECIFIED
Date:22 November 2022
Journal or Publication Title:Journal of Composites Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:6
DOI:10.3390/jcs6120353
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2504-477X
Status:Published
Keywords:composite materials; out-of-plane waviness; knock-down factors; stochastic analysis; random field; Karhunen–Loeve expansion
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Structural Materials and Design
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems
Deposited By: Schuster, Andreas
Deposited On:28 Nov 2022 08:46
Last Modified:19 Oct 2023 11:26

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