Ultimate strength analysis of stiffened plate structures
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Naval architecture and ocean engineering (MPNAV), MSc
Publicerad
2022
Författare
Nwoye, McAnthony
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
An international benchmark study on which this thesis is based compared FEA results
to a reference experiment. The FEA results and experiment were in agreement with
respect to ultimate capacity but not for modes and location of failure. This thesis,
therefore, investigates possible factors that impact ultimate capacity, failure mode and
location. This was achieved analytically and by non-linear finite element analysis.
The method employed was to systematically alter the geometry used in the benchmark
study and then observe the changes that influenced the results. The ultimate capacity of
some of these models was also calculated by implementing existing empirical models
in python. The models were then subjected to linear and non-linear buckling analysis
in Abaqus. The results are presented as force–displacement curves and von Mises stress
plots.
The ultimate capacity was shown to be sensitive to longitudinal stiffener configuration,
longitudinal stiffener dimensions, bottom plate configuration and bottom plate
thickness. The empirical estimation of ultimate capacity was shown to be quite
conservative when compared to the FEA prediction. The failure location however was
found to be most sensitive to the bottom plate configuration. Models with uniform
bottom plate field thickness had an influence on the location of failure. Most
importantly, two of the models with uniform bottom plate fields studied predicted the
failure location recorded in the reference experiment. The effects of the boundary
conditions and direction of force application prescribed are also documented.
Beskrivning
Ämne/nyckelord
failure location , linear buckling analysis , non-linear finite element analysis , ultimate capacity