elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

A MICROMECHANICAL APPROACH TO STUDY THE DAMAGE EVOLUTION OF EPOXY BASED COMPOSITES UNDER FATIGUE LOADING

Krause, Daniel (2015) A MICROMECHANICAL APPROACH TO STUDY THE DAMAGE EVOLUTION OF EPOXY BASED COMPOSITES UNDER FATIGUE LOADING. In: 20th International Conference on Composite Materials. 20th International Conference on Composite Materials, 19.-24. Jul. 2015, Copenhagen, Denmark.

[img] PDF (Paper) - Registered users only
682kB

Abstract

In this contribution, a novel approach to study the matrix crack evolution on a micromechanical level is introduced. For the micromechanical analysis, material models for the fibers, the matrix, and the fiber-matrix-interface are needed. In uniaxial mechanical tests, the epoxy based resin is found to behave viscoplastically. A rheological model is developed and calibrated using cyclic tensile test data. Uniaxial fatigue tests are used to derive a direction-independent failure criterion based on the hysteresis energy. While the interface properties are set to be equal with the neat resin ones, the fibers are idealized to behave elastically and with no damage. Utilizing a cycle jump and degradation framework, an RVE of a fiber-reinforced composite is created. The damage observed in the RVE shows a single, dominant crack perpendicular to the loading direction with a distinct degradation of the effective stiffness in the loading direction. Further investigations regarding the element, and cycle jump size as well as the fiber architecture (volume fraction, radius, RVE size, …) are identified as next steps.

Item URL in elib:https://elib.dlr.de/98389/
Document Type:Conference or Workshop Item (Speech)
Title:A MICROMECHANICAL APPROACH TO STUDY THE DAMAGE EVOLUTION OF EPOXY BASED COMPOSITES UNDER FATIGUE LOADING
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Krause, DanielUNSPECIFIEDUNSPECIFIED
Date:2015
Journal or Publication Title:20th International Conference on Composite Materials
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Fatigue, Composites, Simulation, Material Modelling
Event Title:20th International Conference on Composite Materials
Event Location:Copenhagen, Denmark
Event Type:international Conference
Event Dates:19.-24. Jul. 2015
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Krause, Dr. Daniel
Deposited On:05 Oct 2015 09:01
Last Modified:05 Oct 2015 09:01

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.