research

Hello everyone,

I have a basic question in ABAQUS. For developing a user element in ABAQUS, the strain-displacement tensor, or the so-called B-matrix, needs to be calculated in the UEL subroutine. Applying the B-matrix on the displacement vector gives rise to the strain vector. However, we know that there are more than one strain measure for corresponding, or in other words, different conjugate stress measures.

 What is here not clear for me is what type of strain tensor is calculated by applying B on the displacement vector: (eps=B.d) what is eps here?

Hi!

Can please help me regarding usage of VGETVRM? I am trying to get material point data of EVF in an eulerian analysis using VUSDFLD but failed. Details is below:

parameter( nrData=6 )

character*3 cData(maxblk*nrData)

dimension rData(maxblk*nrData), jData(maxblk*nrData)

do k = 1, nblock

c jStatus = 1

call vgetvrm('EVF',rdata,jData,cData,jStatus)

EVF=rdata(1)

FIELD(k,1)=EVF

stateNew(k,1)=FIELD(k,1)

Hi All,

I would like to know if anyone has had the opportunity to investigate cellular rubbers rheology. I am thinking of characterizing the viscoelastic properties of cellular rubber during cure and after cure in the rheometer, using ASTM D6601. What I am expecting is a distorted cellular structure due to very constrained foam expansion during the blowing agent's decomposition, so the results would obviously be different than the ones obtained from a DMTA machine.

Would like to hear from anyone with some rheology / viscoelastic characterization experience.