Citation
Hassan, Mohd Nizam
(2018)
Influence of stiffener on aluminium perforated plates subjected to in-plane shear loading.
Masters thesis, Universiti Putra Malaysia.
Abstract
Shear buckling is an important phenomenon as it enables the design becomes more
efficient structures which would be possible if the critical buckling load is treated as
the maximum allowable load. This is particularly significant in aerospace industry
where lightweight, strength and reliability structures are known as the important factors
need to be considered when designing and producing the aircraft. A literature review
reveals that although there were many information available regarding to the buckling
strength of elastic plates, but there is just few information available concerning the
effect of shear buckling on the perforated plate. Therefore, the aim of this research was
to study the effect of stiffener on aluminium perforated plates when subjected to shear
loading.
The research was conducted by using numerical method or known as finite element
simulation software which was ABAQUS/CAE 6.10, since this tool were known as the
most suitable technique for solving the problems. Aluminium 7075-T6 was the
materials which have been selected and used throughout the study. Besides, the
geometry of the model which was chosen for this study was square plate and
rectangular plate. Before proceed to the main study, the mesh convergence analysis of
non-perforated square plates and non-perforated rectangular plates were conducted to
verify the method implemented in the research were correct and acceptable. The value
of shear buckling coefficient then was validated by comparing the numerical data
gained from the analysis with the theoretical data obtained from the literature study.
After that, the shear buckling behaviors of perforated plates were studied by varying
the diameter of holes and the quantity of holes on the plate structures. Further study
was conducted into the buckling performance of perforated plates with stiffener under
shear load.
Based on the study, it was found that the design of perforation on the plate structures
reduced the strength of that plate structures. However, when the stiffeners was added
around the circular hole on the plates regions, it was noted that generally by the
presence of the stiffeners improves the strength structure of the plates when compared
with perforated plates. Finally, a full study of all design was finally undertaken which
emphasizing the addition of stiffener have an effect on the buckling performance of the
structure. The research was concludes with evaluations of the analysis and suggestions
for future study direction.
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