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DOFs in Abaqus

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Posts: 3
Topic starter
(@krisbran4)
New Member
Joined: 11 years ago

Hi,

I got a simple 2D problem (a rectangular shell, static general, CPS4R element), with 557 nodes, each of them have 2 DOFs (U1 and U2), [B]according to the data file[/B]. But when I print out the ELEMENT STIFFNESS MATRIX, for each element it is a 12x12 matrix which means the rotational DOF about z axis is also taken into account. How can I omit this 3rd DOF? Can I?

Thank you.

2 Replies
Posts: 3998
(@jorgen)
Member
Joined: 4 years ago

How do you print the element stiffness matrix?

-Jorgen

2 Replies
Posts: 3
Topic starter
(@krisbran4)
New Member
Joined: 11 years ago

[QUOTE=Jorgen,10146]How do you print the element stiffness matrix?

-Jorgen

Hi,

Using

*ELEMENT MATRIX OUTPUT, ELSET=ALL ELT FOR SDT, STIFFNESS=YES

But the problem despite what I said above is the assembling which would be time consuming. Another input command which is available from ABAQUS 6.7-1 is:

*MATRIX GENERATE, one could get the global stiffness, mass or load matrix in a .mtx file. But I am wondering why I cant get the file after the run. Can someone help me plz 🙂

[url] https://www.sharcnet.ca/Software/Abaqus610/Documentation/docs/v6.10/book [/url]...

Here is the keywords:

*HEADING

**

**

** STEP: Step-1

**

*Step, name=Step-1

*Static

1., 1., 1e-05, 1.

*MATRIX GENERATE, STIFFNESS, MASS, LOAD

**

** BOUNDARY CONDITIONS

**

** Name: BC-1 Type: Displacement/Rotation

*Boundary

_PickedSet5, 2, 2

** Name: BC-2 Type: Displacement/Rotation

*Boundary

_PickedSet6, 1, 1

_PickedSet6, 6, 6

**

** LOADS

**

** Name: Load-1 Type: Pressure

*LOAD CASE, NAME=LC1

*Dsload

_PickedSurf4, P, -20.

*END LOAD CASE

**

** OUTPUT REQUESTS

**

*Restart, write, frequency=0

**

** FIELD OUTPUT: F-Output-1

**

*Output, field, variable=PRESELECT

**

** HISTORY OUTPUT: H-Output-1

**

*Output, history, variable=PRESELECT

*End Step

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