Is there a way to output B Matrix using input deck cards

1

Hi,

Is it possible to output the B matrix to a result file using input deck cards in CalculiX, similar to how we can output the stiffness matrix using the *FREQUENCY card?

Thanks!!
Anoop

2

Only the stiffness and mass matrcies can be outputted this way. But since CalculiX is open-source, maybe you could find a way to extract it by looking at the source code where it’s computed.

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3

Thank you @Calc_em for the response.

4

Keep in mind that the B matrix will be based on solid elements, not 1D or 2D simplifications.

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5

Do you mean the composite coupling matrix? I don’t think CCX has that because the composites are solids with stress, rather than shells with force and moment per unit width.

6

I think that the OP means the strain-displacement matrix commonly used in literature when forming the stiffness matrix.

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7

Can anyone identify the file or subroutine within the CalculiX source code where the B-matrix and the constitutive matrix (material property matrix) are computed?

8

Not sure is that easy, I’d start reading carefully chapter 10 of the manual, then try to pull the thread from here…

imagen
imagen679×606 124 KB

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