HELP how to calculate membrane stress in a section
HELP how to calculate membrane stress in a section
(OP)
Hello everyone. I have a problem in calculating the first step in FAQ794-982: How to calculate the membrane and bending stresses in a section:
" 1)Take the average of each stress component. In formula:
σim=( ∫σi dx )/t
where t is the thickness (length of segment), x=0 to t is the abscissa along the thickness and i=1 to 6.
Now you have a single set of six (membrane) stress components"
I start with 2 matrix 3x3 (points start/stop SCL):
σ(xx) σ(xy) σ(xz)
S= σ(xy) σ(yy) σ(yz)
σ(xz) σ(yz) σ(zz)
The rotation matrix is A (3x3)
The new Stress tensor is rotated in local cordinates and is: Sn= A(transposed)*S*A (2 matrix for points start/stop SCL)
How can i do this calculate? σim=( ∫σi dx )/t
The result is 2 matrix? (all the elements of matrix Sn /t ?)
surely wrong
Thanks
" 1)Take the average of each stress component. In formula:
σim=( ∫σi dx )/t
where t is the thickness (length of segment), x=0 to t is the abscissa along the thickness and i=1 to 6.
Now you have a single set of six (membrane) stress components"
I start with 2 matrix 3x3 (points start/stop SCL):
σ(xx) σ(xy) σ(xz)
S= σ(xy) σ(yy) σ(yz)
σ(xz) σ(yz) σ(zz)
The rotation matrix is A (3x3)
The new Stress tensor is rotated in local cordinates and is: Sn= A(transposed)*S*A (2 matrix for points start/stop SCL)
How can i do this calculate? σim=( ∫σi dx )/t
The result is 2 matrix? (all the elements of matrix Sn /t ?)
surely wrong
Thanks





RE: HELP how to calculate membrane stress in a section
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