The Open Collections site will be undergoing maintenance 8-11am PST on Tuesday Dec. 3rd. No service interruption is expected, but some features may be temporarily impacted.
- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Theses and Dissertations /
- Efficient methods for non-linear thermochemical analysis...
Open Collections
UBC Theses and Dissertations
UBC Theses and Dissertations
Efficient methods for non-linear thermochemical analysis of composite structures undergoing autoclave processing Rasekh, Ali
Abstract
Composite structures are increasingly being used in different industries. Their manufacturing imparts some challenges for the industry: most importantly prediction and control of the process to specification. The usual numerical solutions typically based on the use of the finite element analysis are not very suitable for large parts, especially when there is a need for quick estimation of the results for preliminary design and optimization. Therefore, there is a need both to have enhanced solutions that reduce the modeling effort for computer simulation of large and complex structures and also to simplify the solution and provide easy to use methodologies for quick estimations based on tables and charts. In the present work, a simple methodology is developed to estimate the temperature distribution in a thermoset polymer matrix composite slab placed on a tool and subjected to cycles of temperature ramp and hold leading to the curing of the composite and generation of heat due to the internal chemical reactions. Supplementary diagrams are also generated to set limits on the method. A modified finite element solution for heat transfer is also introduced that reduces the mesh generation and computational effort. This "higher order shell element" uses enhanced shape functions and efficient methods for spatial and temporal integrations in order to reduce the computational run times. The developed methods provide the design engineer with efficient analysis tools for predicting the temperature in a composite part. The simple diagrams and tables can be used for preliminary estimation of the temperature distribution in the part at each stage of the material development. The enhanced finite element methodology developed here can be used to reduce the amount of effort necessary in mesh generation and refinements necessary to achieve accurate solutions for thermochemical modelling of complex composite structures during processing.
Item Metadata
Title |
Efficient methods for non-linear thermochemical analysis of composite structures undergoing autoclave processing
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
2007
|
Description |
Composite structures are increasingly being used in different industries. Their manufacturing
imparts some challenges for the industry: most importantly prediction and control of the
process to specification. The usual numerical solutions typically based on the use of the finite
element analysis are not very suitable for large parts, especially when there is a need for
quick estimation of the results for preliminary design and optimization. Therefore, there is a
need both to have enhanced solutions that reduce the modeling effort for computer
simulation of large and complex structures and also to simplify the solution and provide easy
to use methodologies for quick estimations based on tables and charts.
In the present work, a simple methodology is developed to estimate the temperature
distribution in a thermoset polymer matrix composite slab placed on a tool and subjected to
cycles of temperature ramp and hold leading to the curing of the composite and generation of
heat due to the internal chemical reactions. Supplementary diagrams are also generated to set
limits on the method.
A modified finite element solution for heat transfer is also introduced that reduces the mesh
generation and computational effort. This "higher order shell element" uses enhanced shape
functions and efficient methods for spatial and temporal integrations in order to reduce the
computational run times.
The developed methods provide the design engineer with efficient analysis tools for
predicting the temperature in a composite part. The simple diagrams and tables can be used
for preliminary estimation of the temperature distribution in the part at each stage of the
material development. The enhanced finite element methodology developed here can be used to reduce the amount of effort necessary in mesh generation and refinements necessary to
achieve accurate solutions for thermochemical modelling of complex composite structures
during processing.
|
Genre | |
Type | |
Language |
eng
|
Date Available |
2011-02-03
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
DOI |
10.14288/1.0063235
|
URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
|
Campus | |
Scholarly Level |
Graduate
|
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.