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Analytical Approaches to Model the Stiffness Reduction in Multi-Layered Carbon Fiber Composites with Process-Induced Defects

Chrupalla, David and Hartung, Daniel and Khattab, Imad Al-Din (2010) Analytical Approaches to Model the Stiffness Reduction in Multi-Layered Carbon Fiber Composites with Process-Induced Defects. Tenth International Conference on Computational Structures Technology 2010, 14.09. - 17.09. 2010, Valencia, Spanien.

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Abstract

In this paper, we will present analytical models which enable the characterisation of defects in composite materials. First, a study is introduced to determine the reduction of the material stiffness with analytical models. An analytical model based on the Eshelby theory and a three-dimensional laminate theory has been developed to predict the influence of voids on the material properties of a multi-layered fiber composites. Moreover, an efficient analytical approach is presented to account for the influence of fiber waviness on material stiffnesses of multi-layered fiber composites. The fiber waviness is approximated by periodic functions. Effective material stiffnesses are obtained by inserting the functions into transformation equations and integrating over wavelength and height of the laminate. The results of the analytic studies as a basis for future work will be presented.

Document Type:Conference or Workshop Item (Paper)
Title:Analytical Approaches to Model the Stiffness Reduction in Multi-Layered Carbon Fiber Composites with Process-Induced Defects
Authors:
AuthorsInstitution or Email of Authors
Chrupalla, DavidUNSPECIFIED
Hartung, DanielUNSPECIFIED
Khattab, Imad Al-DinUniversität Magdeburg
Date:September 2010
Refereed publication:Yes
In ISI Web of Science:No
Keywords:Faserverbundwerkstoffe, Effects of Defects, Porosität, Faserwelligkeit, Analytische Modelle, Effektive Materialsteifigkeit
Event Title:Tenth International Conference on Computational Structures Technology 2010
Event Location:Valencia, Spanien
Event Type:international Conference
Event Dates:14.09. - 17.09. 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Doris Ries
Deposited On:26 Nov 2010 10:59
Last Modified:26 Nov 2010 10:59

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