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Hi all,

I am looking for an algorithm to get the inverse of a 4^th rank tensor (e.g. the compliance tensor S_(ijkl) from elastic stiffness tensor C_{_(ijkl)}) S_(ijkl)=C_{_(ijkl)}^{^(-1)}

I am programming in FORTRAN, and for this purpose I wasn't able to find neither any algorithm nor any existing subroutine.

If anyone at this forum has any idea about this inversion, kindly guide me.

Best regards,

Mubeen.

I want to start a dynamic calculation in Abaqus in which, for every node, I specify the displacements, velocities and accelerations. I know that by the *IMPORT command, I can start a calculation with a deformed mesh, and that the velocities can be defined by in the *INITIAL CONDITIONS, but how to deal with non zero user defined accelerations? Have any body did that? Is it possible with a subroutine?

Thanks for any help

Hi,

I am trying to model asphalt concrete as viscoelastic mayterial in abaqus. As I have seen from past studies, people have used prony series parameters for time domain viscoelasticity and additionally also used elastic modulus from resilient modulus test data. As I already have dynamic modulus test data, I can calculate prony series parameter from it but the problem is with resilient modulus. Do I need to run resilient modulus test again to get the elastic parameter in abaqus or is there any other way to work with dynamic modulus test?

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Biomass is currently one of the latest sources of renewable energy. Biomass consists of plant matter that is specifically grown for its ability to generate heat or electricity. Mostly this would mean that Biomass consists of dead plant matter, but plants that are still alive can also generate heat and are therefore also included in the term Biomass.

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