On plane stress loading case
On plane stress loading case
(OP)
What is the difference between biaxial loading case and plane stress loading case?
Thanks
Thanks
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On plane stress loading case
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RE: On plane stress loading case
As my old man said to me..
Biaxial does not mean the same as plane.
RE: On plane stress loading case
i think biaxial is plane strain case, which is different from plane stress case.
regards,
sendy.
RE: On plane stress loading case
personally I think it is exactly the same as bi-axial stress.
on the other hand, plane strain implies stress in three directions, usually in thick plates where there is enough material to restrain (prevnet) the plate straining in the thickness direction by creating a stress in the thickness direction.
RE: On plane stress loading case
clear as mud ?
RE: On plane stress loading case
Garland E. Borowski, PE
Borowski Engineering & Analytical Services, Inc.
Lower Alabama SolidWorks Users Group
Magnitude The Finite Element Analysis Magazine for the Engineering Community
RE: On plane stress loading case
"if the panel is thick there will be 2D strain (at the mid-plane of the plate)"
why 2D strain only... if;e.g, you subject a cube to the stresses SigmaX and SigmaY and left the faces normal to Z axis free of Stresses (this is biaxial loading/BC case.. is not it?), then you will have variant strain along the Z axis (due to Poission ratio effect) but your stress along z axis will be zero.
Please correct me if I am wrong
RE: On plane stress loading case
BUT a cube is not a good example of the point I was making (because you're not talking about a size, and size is important). If you have a plate 10"x10"x1" thick and you apply bi-axial in-plane loads to it, I would say that this is going to develop a 3D stress field. If you have a sheet 10" x10"x0.01" then under bi-axial loads this sheet will exhibit 2D stress (ie 3D strain) 'cause there's not enough material to restrain deflections in the thickness direction caused by poission effects).
bi-axial loads can produce bi-axial (plane) stress or tri-axial stress (plane strain).
RE: On plane stress loading case
RE: On plane stress loading case
I change my mind that biaxial loading on a specimen is not necessary plain strain case.
I think what rb1957 said is correct: bi-axial loads can give rise to either plane stress or plane strain conditions depending on the thickness of the panel and the constraint conditions.
For soildynamics: at your post 8.8.2007 12:17, I think there is something missing. A cube is not the same as thick panel. For a think panel, you can say it's plane strain problem.
For a cube under biaxial loading, i think it'll be plain stress as GBor also said. Imagine the cube is vertically loaded compression pressure while horizontal pressure 1 is kept constant and no loading pressure for the other horizontal direction.
regards.
RE: On plane stress loading case