Varying Damping in Explicit Analysis
Varying Damping in Explicit Analysis
(OP)
I am looking to linearly vary the Rayleigh beta damping coefficient of a material. The Abaqus manual (http://xn--90ajn.xn--p1ai/library/abaqus_doc/Docum...) seems to indicate this is possible for an Explicit analysis by changing the inp, but I am missing some details. How do I do this process and how can I chekc that I did it correctly after?





RE: Varying Damping in Explicit Analysis
RE: Varying Damping in Explicit Analysis
RE: Varying Damping in Explicit Analysis
The temperature dependency has the advantage, that you could use Abaqus/CAE to define the spatial variation of the temperature with an Analytical Field in the load module. This would lead to the same variation of the damping.
For the field variable you would have to write a user subroutine to define the spatial variation. I've heard the support for field variables in A/CAE will come in the next release.
RE: Varying Damping in Explicit Analysis
For reference, the modified part of the .inp is:
CODE -->
CODE -->
subroutine vusdfld( c Read only variables - 1 nblock, nstatev, nfieldv, nprops, ndir, nshr, 2 jElem, kIntPt, kLayer, kSecPt, 3 stepTime, totalTime, dt, cmname, 4 coordMp, direct, T, charLength, props, 5 stateOld, c Write only variables - 6 stateNew, field ) c include 'vaba_param.inc' c dimension jElem(nblock), coordMp(nblock,*), 1 direct(nblock,3,3), T(nblock,3,3), 2 charLength(nblock), props(nprops), 3 stateOld(nblock,nstatev), 4 stateNew(nblock,nstatev), 5 field(nblock,nfieldv) character*80 cmname c c Local arrays from vgetvrm are dimensioned to c maximum block size (maxblk) c parameter( nrData=6 ) character*3 cData(maxblk*nrData) dimension rData(maxblk*nrData), jData(maxblk*nrData) c do k=1,nblock y = coordMp(k,2) beta=0.000025d0*y+0.0002d0 field(k,1) = beta stateNew(k,1) = beta field(k,1) = stateNew(k,1) end do c return endRE: Varying Damping in Explicit Analysis
RE: Varying Damping in Explicit Analysis
CODE
What will tell FORTRAN what y and beta are supposed to be?
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RE: Varying Damping in Explicit Analysis