Hello.
I modeled a complex ring in abaqus and with adding below command in keyword, extracted Stiffness matrix with Coordinate format. But output is a .mtx file that listed stiffness for each node (or element). What to do i to assemble this file to reaching to Global stiffness matrix (stiffness matrix for whole part, i mean m(d2x/dt2)+Kx=F)?
*STEP, name=exportmatrix
*MATRIX GENERATE, STIFFNESS
*MATRIX OUTPUT, STIFFNESS, FORMAT=MATRIX INPUT
*END STEP
Hello Mohammad Javad
With these commands, it looks like you have extracted global (assembled) stiffness matrix.
Thanks Mr. Victor J. Аdlucky from your answer.
unfortunately it's not global and it's for each node. the output file is large (about 55 MB) and i capture a picture from it and attach it.
I want the 6×6 stiffness matrix for whole model to doing equivalenting this model to a spring-damper for another analysis.
Mohammad Javad Once you have applied the boundary conditions, your system has 32802 DOFs. Are you interested in modal matrices and corresponding mode shapes?
Nils Wagner no. By above code, the stiffness matrix output has a lot of values that each of them is for a node and it's DOF. I want Stiffness matrix that is for whole model not for each node. For example if i applied a force in x direction, stiffness of whole model for tension in x direction is K=f/dx. Tension matrix in x,y,z direction. Could i explain well?
Mohammad Javad
I'm afraid that Abaqus can not do what you expect. You want to replace complex multimass model by "equivalent" one-element model. This is rather non-formal then routine procedure.
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