 | | From: | dmartin at newarts.com | | Subject: | Re: Question on mechanics of material (Clarification) | | Date: | 7 Jan 2005 12:13:57 -0800 |
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 | Shear stresses (including concentration effects) will probably be a
maximum at 45 degrees compared to +/- a few degrees.
This is covered pretty well in Timeshenko , "Theory of Elasticity."
Things really depend a lot on what you mean by "failure". A slot
perpendicular to the loading axis will develop high local shear
stresses at its pointy end.
These stresses may cause local plastic flow that'll in effect blunt the
slot's tip but not lead to macroscopic failure. Is this ok?
Dave
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| | From: | Philip | | Subject: | Re: Question on mechanics of material (Clarification) | | Date: | Fri, 07 Jan 2005 12:23:26 -0800 |
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| dmartin@newarts.com wrote:
> Shear stresses (including concentration effects) will probably be a
> maximum at 45 degrees compared to +/- a few degrees.
>
> This is covered pretty well in Timeshenko , "Theory of Elasticity."
>
> Things really depend a lot on what you mean by "failure". A slot
> perpendicular to the loading axis will develop high local shear
> stresses at its pointy end.
>
> These stresses may cause local plastic flow that'll in effect blunt the
> slot's tip but not lead to macroscopic failure. Is this ok?
>
> Dave
>
I suppose it is fine as it's the catastrophic type of failure i'm
worried about. Actually i left out some details in the description to
keep things easy. The cavity really runs all the way through the block
in the x-dir and most of the compression is taken by material in the
out-of-plane direction. In this geometry, tilting the cavity 90 degrees
of course dosen't make sense. With this new description, will it still
be worthwhile to make the cavity at say 30 or 60 degree to lower the
chances of shear failure?
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