analysis

[A]

hello guys
im doing force analysis for my team on ansys workbench and facing some problems..example,

suppose im doing analysis on a square block and applying force on 1 side perpendicular to it and for constraint-
1 fixing other side
2 giving frictionless support on other side or giving displacement support in which im giving 0 displacement for opposite side

shouldn't answer be the same???im getting it different..i mean different stress values

[Sormaz]

How different are they?

I would not expect them to be exactly the same.

Think about the effect end constraints have on buckling...is a fixed end the same as a free end?

[Kimbury]

We're done here.

[A]

but if i apply frictionless support to the opposite face,
will it not act as a fixed support for the force in direction perpendicular to the face??

[exFSAE]

Wouldn't it be more appropriate to ask this of your instructors? Or your ANSYS reseller?

[Sormaz]

Originally posted by A:
but if i apply frictionless support to the opposite face,
will it not act as a fixed support for the force in direction perpendicular to the face??
"I don't need to learn this stuff because I can just have the computer do it"

I think you need to meet our friend Poisson

Agreed with exFSAE, this would be a great question for a professor. Try your mechanics of materials guy (the one who teaches you about stress and strain)

[onemaniac]

Originally posted by Sormaz:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by A:
but if i apply frictionless support to the opposite face,
will it not act as a fixed support for the force in direction perpendicular to the face??
"I don't need to learn this stuff because I can just have the computer do it"
</div></BLOCKQUOTE>

Reminds me of what Pat Clarke said in many design review presentations.
"Garbage in garbage out"

A, fixing a face and supporting against a force are two very different things.

[A]

dude the thing is that is the only force im applying...in that case shouldn't it be same??

[Boffin]

But where/how is that force going to be resisted in each case?

[onemaniac]

Originally posted by A:
dude the thing is that is the only force im applying...in that case shouldn't it be same??

Fixing a face is fixing the elements on the surface area, there is no degree of freedom for the surface elements.
On the other hand if you put a friction less support (sliding support) it still gives the surface elements DOF in the remaining other 2 axes.
Why it makes a difference?
If you cared, could have used Sormaz's hint and taken a minute to think about this.


by Sormaz:
I think you need to meet our friend Poisson

Open your mechanics of materials text book or at least google Poisson Effect...