تلخیص
This research paper presents a comparative
numerical analysis to study the effect of drilling a center hole in an
aluminum sheet on the static loading, linear buckling and modal
characteristics of the sheet and compare it with a same sheet with
no drill in it under the same boundary conditions. ANSYS
workbench 15 was used to perform the analysis by using its static
structural, linear buckling and modal modules on an Aluminum
alloy (AA2024-T3) sheet. For analysis of drill geometry, Four
models namely a neat sheet without drill, a sheet with circular
drill, a sheet with triangular drill and a sheet with square drill
were also developed. All drilled models had the same drill area and
were subjected to the same loading conditions as the neat sheet. An
overall reduction in mechanical and vibrational characteristic of
the drilled sheet was observed as compared to its neat counterpart
which was reflected by a 70%increase in the maximum generated
stress and an 11% increase in the corresponding deformation
along with the reduction in buckling load multipliers and modal
natural frequencies. It was observed that the stress generated in
the metallic sheet with a center drill was directly proportional to
the number of stress risers even if the drill area was same. A 68%
increase in stress generated for circular, 71% for triangular and
76% for square drill was observed compared to the neat sample.
The maximum stress was generated on the stress risers
perpendicular to the loading direction.
Zaigham Saeed Toor. (2021) Effect of Drill on Mechanical and Modal Characteristics of Aluminum Sheet, Journal of Space Technology , Volume 11, Issue 1.
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