Simulation of GPHE diagonal based on full material history
(2021) In TFHF-5000 FHLM01 20211Department of Construction Sciences
Solid Mechanics
- Abstract
- The objectives for this thesis is to further develop a finite element analysis methodology where the material history is evaluated in every step. The processing of the plate from coil to fully formed plate mounted in a heat exchanger should be taken into consideration. Material phenomena such as necking and springback are important to capture.
The first attempt was to do the simulation in ANSYS. This was not possible due to bugs in the software. The analysis was therefore carried out in LS-PrePost with LS-Dyna as a solver. A forming simulation, a springback analysis and a gasket simulation were performed where the springback simulation was an addition to the method, lacking from the current method performed at Alfa Laval. The forming... (More) - The objectives for this thesis is to further develop a finite element analysis methodology where the material history is evaluated in every step. The processing of the plate from coil to fully formed plate mounted in a heat exchanger should be taken into consideration. Material phenomena such as necking and springback are important to capture.
The first attempt was to do the simulation in ANSYS. This was not possible due to bugs in the software. The analysis was therefore carried out in LS-PrePost with LS-Dyna as a solver. A forming simulation, a springback analysis and a gasket simulation were performed where the springback simulation was an addition to the method, lacking from the current method performed at Alfa Laval. The forming and gasket simulation was performed with similar setup and settings as the current method with some changes to fit the purpose of this dissertation. To capture material phenomena, two material models were evaluated, Barlat 91 and YLD2000, and possible improvements to the finite element analysis was tested. The forming and the springback of the plate was analysed with the material models with 5, 7 and 11 integration points.
Even though ANSYS is a more user-friendly software, the LS-Dyna method was the favourable workflow. LS-Dyna is better suited to work with metal forming and the mapping of stresses and strains between the simulations, which were important to capture the material history, were successful.
The mapping of the stresses and strains for the plates were successful and in the final gasket simulation, residual stresses and plastic strains were present, meaning that the material history is taken into consideration at the final stage. The simulations also showed different results depending on the material model and number of integration points but further analysis with physical tests are necessary to determine which model is the most similar to the actual plate. (Less) - Popular Abstract
- The world’s population is steadily increasing. While the standard of living is rising rapidly for many, the earth’s natural resources are declining and large amounts of waste are being generated. Renewable energy contributes to our planet’s long-term sustainability and brings significant benefits to our climate, our health and our economy. Heat exchangers play an important role in the growth of renewable energy.
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9046545
- author
- Gunnarsson, Anna LU and Hoang, Jenny LU
- supervisor
- organization
- course
- FHLM01 20211
- year
- 2021
- type
- H3 - Professional qualifications (4 Years - )
- subject
- publication/series
- TFHF-5000
- report number
- TFHF-5242
- language
- English
- id
- 9046545
- date added to LUP
- 2021-06-16 16:39:08
- date last changed
- 2021-06-16 16:39:08
@misc{9046545,
abstract = {{The objectives for this thesis is to further develop a finite element analysis methodology where the material history is evaluated in every step. The processing of the plate from coil to fully formed plate mounted in a heat exchanger should be taken into consideration. Material phenomena such as necking and springback are important to capture.
The first attempt was to do the simulation in ANSYS. This was not possible due to bugs in the software. The analysis was therefore carried out in LS-PrePost with LS-Dyna as a solver. A forming simulation, a springback analysis and a gasket simulation were performed where the springback simulation was an addition to the method, lacking from the current method performed at Alfa Laval. The forming and gasket simulation was performed with similar setup and settings as the current method with some changes to fit the purpose of this dissertation. To capture material phenomena, two material models were evaluated, Barlat 91 and YLD2000, and possible improvements to the finite element analysis was tested. The forming and the springback of the plate was analysed with the material models with 5, 7 and 11 integration points.
Even though ANSYS is a more user-friendly software, the LS-Dyna method was the favourable workflow. LS-Dyna is better suited to work with metal forming and the mapping of stresses and strains between the simulations, which were important to capture the material history, were successful.
The mapping of the stresses and strains for the plates were successful and in the final gasket simulation, residual stresses and plastic strains were present, meaning that the material history is taken into consideration at the final stage. The simulations also showed different results depending on the material model and number of integration points but further analysis with physical tests are necessary to determine which model is the most similar to the actual plate.}},
author = {{Gunnarsson, Anna and Hoang, Jenny}},
language = {{eng}},
note = {{Student Paper}},
series = {{TFHF-5000}},
title = {{Simulation of GPHE diagonal based on full material history}},
year = {{2021}},
}