Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Development and implementation of high temperature resistant resin systems that can be used with fiber/fabric reinforcement for use in missile/rocket applications
Download
index.pdf
Date
2017
Author
Kaya Deniz, Tuğba
Metadata
Show full item record
Item Usage Stats
166
views
56
downloads
Cite This
Motor case of a rocket/missile system is exposed to hot and high pressure gases. Its structural components such as control surfaces, outer casing are exposed to mechanical loads and aerodynamic heating due to the high velocity of the system. Therefore reinforced resin matrix polymeric composite materials are needed. These materials are applied inside and outside of the rocket/missile system in order to resist the aforementioned conditions. Considering the increasing difficulties in design criteria, rocket/missile systems that can carry its mission in harsh environments should be manufactured. This necessitates resins that possess advanced thermal and mechanical properties and high Tg than the currently used composite materials. Due to their strategic importance for the defense industry, international treaties limit importing these resins from other countries. In this thesis, fiber/fabric reinforced composite materials were manufactured from benzoxazine derivatives. The manufactured composite materials were confirmed by accomplishing laboratory scale thermal and mechanical tests. Synthesis of benzoxazine monomers was achieved in high yields under optimized reaction conditions by using phenol, aldehyde and amine derivatives. The characterization of these compounds was made via NMR and FTIR). Polymerization of these monomers was studied under appropriate curing conditions. The thermal and mechanical properties of obtained thermoset materials were examined. The composite materials were manufactured from these resins, which possessed desired thermal and mechanical properties (char yield %30, Tg 150 C).
Subject Keywords
Gums and resins.
,
Fire resistant polymers.
,
Glass transition temperature.
,
Materials
URI
http://etd.lib.metu.edu.tr/upload/12620859/index.pdf
https://hdl.handle.net/11511/26323
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Designing heat exchanger with spatially variable surface area for passive cooling of PEM fuel cell
Ozden, Ender; Tolj, Ivan; Barbir, Frano (2013-03-01)
The purpose of this work was to design a heat exchanger for a Polymer Electrolyte Membrane (PEM) fuel cell, which would ensure such a temperature profile along the fuel cell cathode channel resulting in close to 100% relative humidity along the channel without external humidification. To achieve this, 3D numerical simulations of a single PEM fuel cell were performed using commercial Computational Fluid Dynamics (CFD) software (ANSYS Fluent). Based on the simulation results a variable surface area finned hea...
Prediction of Pressure Variation at an Elbow Subsequent to a Liquid Slug Impact by Using Smoothed Particle Hydrodynamics
DİNÇER, Ali Ersin; Bozkuş, Zafer; TIJSSELING, A. S. (2018-06-01)
Liquid slug flow driven by pressurized air in an inclined pipe with a downstream elbow is investigated numerically. As the liquid slug hits the elbow, the impact pressure and the associated force generated at the elbow may damage pipe supports as well as the pipe itself. It is essential for the design engineers of pipeline systems to accurately predict the pressure trace during the impact for safe operation. The slug arrival velocity and slug length (i.e., mass) at the elbow directly affect that pressure. I...
Numerical investigation of protection measures against water hammer in the Yeşilvadi hydropower plant
Dursun, Samet; Bozkuş, Zafer (null; 2014-10-25)
Pressurized hydraulic systems are vulnerable to water hammer, which is an unsteady hydraulic problem. Changes of direction or velocity of the water in the system cause sudden increase in pressure and pipeline may collapse or burst. The purpose of this paper is to analyze pressure relief valves (PRV), which are used as protection measures against water hammer, numerically and compare the results with measured field data of a run-of-river hydropower plant project. The hydropower system is investigated numeric...
Development of anodes for direct oxidation of methane fuel in solid oxide fuel cells
Akdeniz, Yelda; Timurkutluk, Bora; Timurkutluk, Cigdem (2016-06-22)
In addition to pure hydrogen, solid oxide fuel cells (SOFCs) can utilize hydrocarbons as a fuel. However, conventional Ni-based anodes exhibit an excellent catalytic activity towards the hydrocarbon cracking reaction and thus the carbon deposition occurs in the anode. The deposited carbons quickly deactivate the anode irreversibly by covering the active surface of the anode catalyst. As a result, a significant degradation in the cell performance can be seen. In this study, the anode structure is modified by...
Mathematical expression of the temperature profile and experimental determination of compression heating of ethylene glycol during high hydrostatic pressure processing
Buzrul, S.; Alpas, Hami; Largeteau, A.; Demazeau, G. (Informa UK Limited, 2007-03-01)
In this study, we aimed to describe the temperature profile in the pressure vessel and the compression heating during high hydrostatic pressure (HHP) processing. Regression coefficients (R-2), root mean square error (RMSE) values and residual plots suggested that fourth-order polynomial function produced reasonable fits to define the temperature profile for all the pressures studied (300-600 MPa). If all the coefficients of this empirical model are determined, initial and final temperatures, a value close t...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
T. Kaya Deniz, “Development and implementation of high temperature resistant resin systems that can be used with fiber/fabric reinforcement for use in missile/rocket applications,” Ph.D. - Doctoral Program, Middle East Technical University, 2017.