Finit elementanalys av cisterntak
Ladda ner
Typ
Examensarbete på kandidatnivå
Program
Publicerad
2020
Författare
Karlsson Widén, Oscar
Tegnemyr, Klas
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Cisterns are often used for storing liquids, these can in many cases be dangerous and are
therefore subjected to inspection. Calculation in connection with design control is in many
cases required and is largely performed using formula-based methods. For some parts of the
cistern, calculations with finite element analysis (FEA) can be meaningful. One concern for
these FEA calculations is the time required for the modeling of the design as well as the
execution of different load cases. By developing an FE model, which can easily be adjusted
to the desired dimensions and materials and can perform a realistic evaluation of the strength,
both time and money will be saved.
The FE model's analysis has been limited to contain only the roof of the cistern and should be
located in the Gothenburg area. The model is based on full contact surface between
neighboring parties, this being because it has been defined that welds should not be included
in the model, this is to simplify the model and then welds are not considered critical to the
design.
The work has been carried out at Chalmers premises in Lindholmen as well as DEKRA
industrial office on Gamlestadsvägen in Gothenburg. Where study of the supplied drawings
has laid the foundation for the development of a reliable FE model.
Through work in Solidworks, the model was developed which can easily be changed to the
desired dimensions and materials. Hand calculations have produced the load cases that will
be assigned to the model, which is based on excerpts from Eurocode standards. By
performing the hand-calculated verification calculations, the FE model's reliability could be
analyzed.
The FE model's finite element analysis was carried out in the Ansys program, where its
results have been analyzed against accepted Eurocode standards. The results of the work
show a simple adjustable FE model which, with the FEA, provides a good and credible
evaluation of the model's strength. The results from the verification calculations indicate that
the model is correctly loaded and shows a credible result. The evaluation of the result does
not take tilting and cracking into account.