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

Development of Virtual Micro-Models for Prediction of Macroscopic Properties of Ceramic Matrix Composites (CMCs) and Optimization of Manufacturing Process

Kosin, Marvin and Jain, Neraj (2018) Development of Virtual Micro-Models for Prediction of Macroscopic Properties of Ceramic Matrix Composites (CMCs) and Optimization of Manufacturing Process. Master's, Ruhr Universität Bochum, Institut für Bauweisen und Strukturtechnologie.

Full text not available from this repository.

Abstract

The Finite Element Method (FEM) is used to obtain the stress distribution in the material as a reaction to the thermal load which is applied. A Cohesive Zone Model (CZM) approach is used to implement fracture behavior of the material. Material specific input parameters for the simulations are determined by experiments and taken from literature. Scanning Electron Microscope (SEM) images show that the developed models represent the behavior of the physical material in an excellent way. According to this study, the presence of initial defects prior to the pyrolysis and a homogeneous distribution of these defects in the matrix are crucial for the formation of an ordered crack pattern. A homogeneous defect distribution leads to defined growth of segmentation cracks. Defect types which mainly govern the crack development are stress induced microcracks which appear during curing of a thermosetting resin to CFRP. The influence of the interface strength and the interface area are also studied. A strong interface and a low interface area support the growth of segmentation cracks. The courses of the porosity and crack density increase fit well to other findings in literature. The porosity increases in a linear fashion. The crack density increases linearly before approaching a constant value. This study shows that a weak fiber/matrix Interface leads to a higher porosity and crack density increase during pyrolysis.

Item URL in elib:https://elib.dlr.de/126028/
Document Type:Thesis (Master's)
Title:Development of Virtual Micro-Models for Prediction of Macroscopic Properties of Ceramic Matrix Composites (CMCs) and Optimization of Manufacturing Process
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kosin, Marvinmarvin.kosin (at) rub.deUNSPECIFIED
Jain, NerajNeraj.Jain (at) dlr.dehttps://orcid.org/0000-0002-7853-1894
Date:October 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:101
Status:Unpublished
Keywords:CMC, cohesive Zone, pyrolysis, process simulation
Institution:Ruhr Universität Bochum, Institut für Bauweisen und Strukturtechnologie
Department:Materials Science and Simulation, Keramische Verbundstrukturen
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 - Structures and Materials (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Jain, Neraj
Deposited On:18 Jan 2019 14:15
Last Modified:18 Jan 2019 14:15

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.