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# 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.

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