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Abaqus-Change material properties using field variable in the second step.

Submitted by gamal.mohamed on

Hello everyone,

 I am using Abaqus 6.12. 

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I have problem to change
the material properties in my model. I need your help, i spend more than week
to solve this problem. please try to help me.

 I want to change the
material properties in the second step. I use the *field key words, but
i might perform a mistake that is why, it did not work. i find that the in the
second step the young's modulus still the one which i used in the first ste.

the model is so simple, it is a block, i squeeze this block, i made a set its name is all. I name this set when i define the section. I read some posts that the name of the set should correspond to the instance (assembly) i try to use this name, but it did not work also. 

*Material ,
name=Material-1

*Elastic, dependencies=1

 3E+06, 0.3, ,  0.

30000., 0.3, ,  1.

 *Initial
conditions,type=field,variable=1

All,0

 ** STEP: Step-1

*Step, name=Step-1

*Static

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

 ** STEP: Step-2

*Step, name=Step-2

*Static

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

*Field, variable=1

All,1

 Thank you.

 

Dear All,

 I attached part of input file,the begining of the input file is nodal co-ordinates and element connectivity, i did not attach this part. the model is so simple, it is a uniaxial compression for a block. i wish if any one can help me find the error in the input file,i.e, why i could not change the material properties in the second step using the *filed keyword.

 

*Nset, nset=_PickedSet2, internal, generate

    1,  1331,     1

*Elset, elset=_PickedSet2, internal, generate

    1,  1000,     1

*Nset, nset=Nall, generate

    1,  1331,     1

** Section: Section-1

*Solid Section, elset=_PickedSet2, material=Material-1

*End Part

****

** ASSEMBLY

**

*Assembly, name=Assembly

** 

*Instance, name=Part-1-1, part=Part-1

*End Instance

** 

*Nset, nset=_PickedSet4, internal, instance=Part-1-1, generate

   11,  1331,    11

*Elset, elset=_PickedSet4, internal, instance=Part-1-1, generate

   10,  1000,    10

*Elset, elset=__PickedSurf5_S6, internal, instance=Part-1-1, generate

   1,  991,   10

*Surface, type=ELEMENT, name=_PickedSurf5, internal

__PickedSurf5_S6, S6

*End Assembly

**

** MATERIALS

**

*Material, name=Material-1

*Elastic, dependencies=1

 3000., 0.3, ,  0.

3000., 0.3, ,  1.

**

** BOUNDARY CONDITIONS

**

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

*Boundary

_PickedSet4, 1, 1

_PickedSet4, 2, 2

_PickedSet4, 3, 3

**



*Initial conditions, type=field, variable=1

Nall,0

*Amplitude, name=fieldstep

0.0, 1.0, 1, 1.0

** ----------------------------------------------------------------

**

** STEP: Step-1

**

*Step, name=Step-1

*Static

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

**

** LOADS

**

** Name: Load-1   Type: Pressure

*Dsload

_PickedSurf5, P, 1000.

**

** 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

** ----------------------------------------------------------------

**

** STEP: Step-2

**

*Step, name=Step-2

*Static

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

*field, variable=1, Amplitude=fieldstep

Nall,1

**

** 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

 

Mon, 04/15/2013 - 04:10 Permalink