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Section force componets (SF)

Section force componets (SF)

Section force componets (SF)

(OP)
Hi all,

When all section force and moment components are printed in the .DAT file this is what I get:

ELEMENT PT FOOT- SF1 SF2 SF3 SF4 SF5 SF6 SM1 SM2 SM3
NOTE

(I´m using S4R shell elements)
Why appear 6 force components? (I thought that only 3 components should
appear, like with the moments)

What do these 6 components mean?

Thanks all

RE: Section force componets (SF)

If you have access to the HTML documetation, you can search it quickly!!!


From ABAQUS Analysis User's Manual
->23.6.7 Three-dimensional conventional shell element library  

  
"Section forces, moments, and transverse shear forces

Available for elements with displacement degrees of freedom.
SF1 Direct membrane force per unit width in local 1-direction.
 
SF2 Direct membrane force per unit width in local 2-direction.
 
SF3 Shear membrane force per unit width in local 1–2 plane.
 
SF4 Transverse shear force per unit width in local 1-direction (available only for S3/S3R, S3RS, S4, S4R, S4RS, S4RSW, S8R, and S8RT).
 
SF5 Transverse shear force per unit width in local 2-direction (available only for S3/S3R, S3RS, S4, S4R, S4RS, S4RSW, S8R, and S8RT).

The section force SF6, which is the integral of S33 through the shell thickness, is reported only for finite-strain shell elements and is zero because of the plane stress constitutive assumption. The total number of attributes written to the results file for finite-strain shell elements is 9; SF6 is the sixth attribute

SM1 Bending moment force per unit width about local 2-axis.
SM2 Bending moment force per unit width about local 1-axis.
SM3 Twisting moment force per unit width in local 1–2 plane."
 

RE: Section force componets (SF)

(OP)
Thank you very much for the answer xerf! I´m going to take a look to that part of the documentation

RE: Section force componets (SF)

(OP)
Hi all

After reading the documentation I have a question : I´m using S4R shell elements and I want to get the element section forces and moments (3 forces + 3 moments) like when you write " FORCE(SORT1,REAL,BILIN)=ALL " in the .BDF file in NASTRAN. How can I do this????

Because after reading the documentation I´ve realised that this components I get when SF is printed in the .DAT, are not the same that I get with NASTRAN (Except SF1 that coincides with NASTRAN´s Fx)

Thanks

RE: Section force componets (SF)

(OP)
The problem is solved. The force components I was looking for were SF1 SF2 SF3 as you have said. The problem was that I was using S4R elements and this 3 force components didn´t coincide with Nastran´s Fx Fy Fz. After changing to S4 elements this 3 force components were equal to Nastran´s components so the problem was solved.

Thanks all for your answers.

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