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FE-BASED PREDICTION OF PROCESS INDUCED DISTORTIONS AND RESIDUAL STRESSES FOR CFRP FRAMES

Liebisch, Martin and Hein, Robert and Wille, Tobias (2015) FE-BASED PREDICTION OF PROCESS INDUCED DISTORTIONS AND RESIDUAL STRESSES FOR CFRP FRAMES. 5th EASN Association international Workshop on Aerostructures, Manchester. (Unpublished)

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Abstract

This paper deals with a simulation strategy for the prediction of process-induced distortions and residual stresses of composite frames. The mechanical material behavior is described by a viscoelastic material model depending on temperature and degree of cure. For the description of the reaction kinetic a phenomenological based model considering chemical and diffusion-controlled reactions is introduced. To this, reaction model parameters are fitted to isothermal and dynamic DSC measurements. The thermal expansion and chemical shrinkage are characterized by thermal mechanical analysis and using the contact angle measurement method. The required mechanical material parameters are derived by dynamic mechanical analyses. The simulation strategy is demonstrated for a CFRP frame of an aircraft fuselage. Based on a sequentially coupled temperature-displacement analysis temperature and degree of cure distributions are determined. Corresponding process-induced distortions and occurring residual stresses are calculated and analyzed. The results of the process-induced distortions are used to derive a compensated tooling design. An analogous simulation with the compensated design shows the applicability of this approach.

Item URL in elib:https://elib.dlr.de/98637/
Document Type:Conference or Workshop Item (Speech)
Title:FE-BASED PREDICTION OF PROCESS INDUCED DISTORTIONS AND RESIDUAL STRESSES FOR CFRP FRAMES
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Liebisch, Martinmartin.liebisch (at) dlr.dehttps://orcid.org/0000-0001-5423-7511
Hein, RobertFA-STMUNSPECIFIED
Wille, TobiasFA-STMUNSPECIFIED
Date:September 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:Process simulation, Process-induced distortions, Residual Stresses.
Event Title:5th EASN Association international Workshop on Aerostructures
Event Location:Manchester
Event Type:international Conference, Workshop
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation, L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Liebisch, Martin
Deposited On:19 Oct 2015 08:33
Last Modified:10 Dec 2018 21:13

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