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Need help in resolving an ABAQUS error about degrees of freedom of a temp-disp process

voloacastefan's picture

ABAQUS - DEGREE OF FREEDOM 11 AND AT LEAST ONE OF DEGREES OF FREEDOM 1 THRU 6 MUST BE ACTIVE IN THE MODEL FOR *COUPLED TEMP-DISP. CHECK THE PROCEDURE AND ELEMENT TYPES USED IN THIS MODEL.  

Hi,

I’m trying to learn ABAQUS to simulate temperature-displacement problems.So, I’ve started on a simple example: two plates in contact, the 2nd presses and moves on the 1st plate (which is fixed).Could anyone tell me why the program gives me this error:

DEGREE OF FREEDOM 11 AND AT LEAST ONE OF DEGREES OF FREEDOM 1 THRU 6 MUST BE ACTIVE IN THE MODEL FOR *COUPLED TEMP-DISP. CHECK THE PROCEDURE AND ELEMENT TYPES USED IN THIS MODEL. 

Let me tell you what I’ve made:

1.       I draw two plates (3D)

2.       At proprieties: - two materials (for each plate) – I specified: density, elastic proprieties, conductivity, specific heat;- create two section for each material;- assign those sections for each plate.

3.       Assembly – I positioned plates one above other to make possible the contact

4.       Interaction – I let the program to find contact pairs (with small sliding in Kinematic contact method). There I declare the Contact Property – penalty for tangential behavior, hard contact for normal behavior and heat generation with default values.The contact takes place in the Initial Step

5.       Steps – there I made three steps:

-   Initial one

-  1st  pressure

-  2nd velocity

-  3rd temp-disp

The fact is that I tried to work with abaqus static (same error) and with abaqus explicit. Now I remain on Explicit (dynamic explicit).

6.       Loads:

- BC bottom surface of 1st element ENCASTRE (initial step)

- pressure on the top of 2nd element (1st step - pressure)

- BC velocity for the 2nd element (the one who is pressed) (2nd step - velocity)

- BC temperature – Ex: 20 Cdgr (3rd step – temp-disp)

7.       Then I run the program. If I let the 3rd step it gives me that Error message.If I run the program without 3rd step works good and let me see the movement of the plate and the mechanical stress.

 

 

Thanks for your attention 

Regards,

Stefan Voloaca

sagar

sagar

sagar

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