stress relieving holes for octogonal plate
stress relieving holes for octogonal plate
(OP)
Hi there!
I have an octogonal plate with a central hole, subjected to both compressive and tensile pressures. I've been trying to add stress relieving holes to the plate to reduce the stress. I've been using FEM to model it through trial and error. This is getting on my nerves - to do it without the understanding. I would like to seek the help from experts regarding stress relieving hole concepts such as size, location and force flow. any exerts able to help? thanks!
The picture of the plate with applied pressure can be seen below.
I have an octogonal plate with a central hole, subjected to both compressive and tensile pressures. I've been trying to add stress relieving holes to the plate to reduce the stress. I've been using FEM to model it through trial and error. This is getting on my nerves - to do it without the understanding. I would like to seek the help from experts regarding stress relieving hole concepts such as size, location and force flow. any exerts able to help? thanks!
The picture of the plate with applied pressure can be seen below.






RE: stress relieving holes for octogonal plate
RE: stress relieving holes for octogonal plate
tg
RE: stress relieving holes for octogonal plate
Trainguy - the loads can be considered uniformly distributed forces.
RE: stress relieving holes for octogonal plate
Is this a homework assignment question? Have your Prof. post his comments and suggestions.
RE: stress relieving holes for octogonal plate
RE: stress relieving holes for octogonal plate
moreliagtp...an elliptical hole will change the stress distribution, but will increase in some areas and decrease in others. You will likely see an increase in shear stress near the "corners" of the ellipse. This will increase the tendency for "oil canning" if the plate is thin.
I would suggest that you first consider an octagonal hole within the plate. Compute the stresses across the "flats" in each direction. Size the interior octagon to get the stresses to levels you want, circumscribe a circle within the inner octagonal...you'll be close.
Be careful of buckling in the compressive direction if your plate is relatively thin.