Hoop stress
Hoop stress
(OP)
Hi,
Can anybody help me. I have got stress in X and Y direction with SAMCEF software (I use cartesian coordinate systems) and i would like to deternime the hoop stress. Can anybody tell me how to get hoop stress from principal stress (X and Y).
Can anybody help me. I have got stress in X and Y direction with SAMCEF software (I use cartesian coordinate systems) and i would like to deternime the hoop stress. Can anybody tell me how to get hoop stress from principal stress (X and Y).





RE: Hoop stress
RE: Hoop stress
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Hoop stress
if you have a cylinder (or a curved surface) and a pressure, then you can calc hoop stress ('cause you'll have R, t, and p)
another day in paradise, or is paradise one day closer ?
RE: Hoop stress
RE: Hoop stress
Can't you generate a cylindrical coordinate system?
RE: Hoop stress
another day in paradise, or is paradise one day closer ?
RE: Hoop stress
RE: Hoop stress
RE: Hoop stress
RE: Hoop stress
so you should have one element aligned to the tangential direction (and so telling you hoop stress).
or you can calc hoop stress by hand. (and compare to your model results)
another day in paradise, or is paradise one day closer ?
RE: Hoop stress
This is my model. I have found that (in one element) X stress = 67.7 MPa
Y stress = 334 MPa
Z stress = 11.1 MPa
How can i calcul hoop stress ?
RE: Hoop stress
RE: Hoop stress
I would like to calcul stress in element num 218 as shown in thee figure.
[cos theta -sin theta 0 ]
[sin theta cos theta 0]
[0 0 1]
To obtain stress in cylindric cordinate system should i multiply this matrix * the vector [ stress (x), stress (y) , stress(z)] to obtein the stress in cylindric system?
RE: Hoop stress
Given your latest sketch of the cylinder (your 30NOV15, 16:58 post), why don’t you consider the following. At any given Z plane (latitude), and in (or very near to) the X plane, won’t the Y stress component be the hoop stress? At the same Z plane, and in (or very near to) the Y plane, the X stress component should be the hoop stress, and it should be essentially equal to the Y hoop stress you found previously. At any other location on the circle you have to do some adjusting and summing of the stress components (X & Y) to transform them to be pointing in a radial and circumferential direction. The Z stress component should be the same all the way around. The above, assumes of course, an infinitely long cylinder in the Z direction, without any anomalies which cause significant stress changes. You shot a major bull when you modeled this cylinder by not taking advantage of symmetry, by not placing the Z axis at the center of rotation of the cylinder, and by not using polar (or cylindrical) coordinates to model it. Remember, a computer program does not a thinking engineer make.
RE: Hoop stress
and doesn't provide a local option ??
with such lousy results, pick an element where the global axes align with the hoop direction. previous posts about using vector summing also apply.
another day in paradise, or is paradise one day closer ?
RE: Hoop stress