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Problem in Extracting Mass Matrix in Abaqus

hello,

I am trying to extract mass and stifness matrices of a simple beam using abaqus. The stiffness matrix works fine but when i requested the mass matrix to be exctraced the section in the ASCII related to mass matrix is empty. here my script:

*HEADING

 

Fixed Beam

ELEMENT: B21

*NODE

1, 0., 0.

11, 1000., 0.

*NGEN,NSET=allnodes

1,11

*ELEMENT,TYPE=B21

1,1,2

*ELGEN,ELSET=elset

1,10

*BEAM SECTION,SECTION=RECT,ELSET=elset,MATERIAL=Concrete

200., 300.,

*MATERIAL,NAME=Concrete

*DENSITY

0.24,

*ELASTIC

30000,0.15

*BOUNDARY

1,ENCASTRE

*STEP,PERTURB

*STATIC

*CLOAD

5,2,-1000                                                         

*FILE FORMAT,ASCII

*EL PRINT,FREQ=0

*EL FILE,FREQ=0

*OUTPUT,FIELD,FREQ=0

*OUTPUT,FIELD

*ELEMENT OUTPUT

*ELEMENT MATRIX OUTPUT,ELSET=elset,MASS=YES,OUTPUTFILE=USER,FILENAME=Test

*ELEMENT MATRIX OUTPUT,ELSET=elset,MASS=YES,OUTPUT FILE=RESULTS FILE

*ELEMENT MATRIX OUTPUT,ELSET=elset,MASS=YES,OUTPUTFILE=USER

*END STEP

 

Please Advise

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