"Hi Michael:
I have checked like you suggested and result are 5.2 mm for deflection and 25,6 MPa for sigma YY, which is in line with other calculations.
Nevertheless it might be a little bit tricky to predict when the boundary conditions are working…"
Simulate Early, Simulate Often... In Rhino
Jose Cristos's Discussions
Linear Edge restrains
5 Replies
Hi all,I am trying to model a plate with uniform pressure and simply suppported at its four edges.So I create the plate 2000x1000x25 mm, put the pressure load and restrain the two consecutive edges…Continue
Started this discussion. Last reply by Jose Cristos Mar 13.
Plots Interpretation
9 Replies
Hello:I´m trying to interpretate SnS plots and compare them to analythical values for a clamped beam under distributed load.Special concern about Shear stress XZ as I work with composites and for…Continue
Started this discussion. Last reply by Bob Johansson May 25, 2012.
Stress coordinate system
1 Reply
Hello:What is the coordinate system stresses are refered to? The Rhino universal or any other local?Continue
Started this discussion. Last reply by Michael Freytag Mar 13, 2012.
Out of Plane Shear
2 Replies
Hello!I´m using SnS for aprox. calculation of structures in composites. Although SnS only works with isotropic materials, it provides me with a very useful approximate value for deflection and…Continue
Started this discussion. Last reply by Jose Cristos Jan 24, 2012.
Jose Cristos's Page
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Michael Freytag replied to Jose Cristos's discussion 'Linear Edge restrains'
"Jose-
Edge restraints are inherently non-physical (stress= force/area, area=zero), so I'm always skeptical of the stress results in their neighborhood. That said, I too am also seeing the odd "clamping" behavior, which suggests…"
Jose Cristos replied to Jose Cristos's discussion 'Linear Edge restrains'
"Hi Michael,
I can see that the wrong effect happens no more.
Solid 6016 Aluminium plate, 15 mm. 2000x1000 mm plate under 0.0132 MPa pressure. Supported on two linear edges X, Y, Z restricted and other two just Z restricted (four linear edges).
Two…"
Michael Freytag replied to Jose Cristos's discussion 'Linear Edge restrains'
"Jose,
Thank you for pointing out this bug.
I found the source of the trouble and corrected it. Download the latest version (1.6.1.3) from here and let me know if it works better.
~Michael"
Michael Freytag replied to Jose Cristos's discussion 'Linear Edge restrains'
"Jose,
I am also seeing that behavior here. I don't have an explanation, but I suspect a bug. I will let you know what I find.
~Michael"
Jose Cristos posted a discussion
Linear Edge restrains
Hi all,I am trying to model a plate with uniform pressure and simply suppported at its four edges.So I create the plate 2000x1000x25 mm, put the pressure load and restrain the two consecutive edges in x, y and z directions and the other two edges just in z direction.I get a strange result in which the dflection is like the plate moves paralell in opposite direction to load pressure.I tried different linear edge restrain arragemet and loads (pressure, scaler)Does any one have an idea if I am…See More
Bob Johansson replied to Jose Cristos's discussion 'Plots Interpretation'
"HI:
I guess I'm thinking of a beam with depth and you are thinking of a flat panel
which would be a layer in a composite, so here is my reference so we are comparing apples
and apples. I will try a calculation and post it…"
Jose Cristos replied to Jose Cristos's discussion 'Plots Interpretation'
"My believe is that it is not t= thickness but b=beam width.
It would be brilliant if Mike could give us his thoughts!
"
Bob Johansson replied to Jose Cristos's discussion 'Plots Interpretation'
"HI:
I have experienced similar problem discrepancies between my computer analysis and
hand calculations which I used to check my results on various projects. Previously, I found the problem
was the way I was contraining or holding…"
Bob Johansson replied to Jose Cristos's discussion 'Plots Interpretation'
"Sorry, that was a typo
T = VQ/It
it was a bad hair day.
Mike probably has lots to say about shear stress
because its his specialty.
"
Jose Cristos replied to Jose Cristos's discussion 'Plots Interpretation'
"Yes, like in a panel suported at four sides. Then we have Sxz and Syz."
Jose Cristos replied to Jose Cristos's discussion 'Plots Interpretation'
"Hi Bob: Thanks for your reply. Yes I agree with you. Just replace the T at the denominator for beam width. If the beam is in the X direction and the thickness in Z, then this shear is Sxz, "out-of plane shear", usually called. At a…"
Bob Johansson replied to Jose Cristos's discussion 'Plots Interpretation'
"If the stress element is three dimensional then there
would be horizontal shear in two horizontal directions
providing for static equalibriaum."
Bob Johansson replied to Jose Cristos's discussion 'Plots Interpretation'
"Looking at a stress element in a beam loaded under vertical shear, there has to be a horizontal shear component to offset the vertical shear for static equalibrium to occur
"
Bob Johansson left a comment for Jose Cristos
"Looking at a stress element in a beam loaded under vertical shear, there has to be a horizontal shear component to offset the vertical shear for static equalibrium to occur."
Bob Johansson replied to Jose Cristos's discussion 'Plots Interpretation'
"Are you asking about the meaning of the horizontal shear stress that exists in a
beam? This is important in composite beams because each layer of the beam is fastened
together and the strength of the fastening mechanisim has to be sufficient to…"
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Comment Wall (1 comment)
- At 11:47am on May 23, 2012,
Bob Johansson said… Looking at a stress element in a beam loaded under vertical shear, there has to be a horizontal shear component to offset the vertical shear for static equalibrium to occur.
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