General Mechanical

General Mechanical

Question on viscoelasticity

    • twata
      Subscriber
      When we define a viscoelastic material model as a combination of elastic or hyperelastic material and Prony series, what do the elastic/hyperelastic constants represent - the long term or the instantaneous response?n
    • HuiLiu
      Ansys Employee
      The elastic or the hyperelastic terms represent the instantaneous (at t=0 s) response, or in other words, it represents the high strain-rate response.n
    • sivaavs
      Subscriber
      Our group has been working hard for the past three months to figure out how to implement a large strain viscoelastic material model in AUTODYN. We are all new to using AUTODYN/ANSYS. I know that ABAQUS supports a user subroutine UMAT where the user can write his/her own code to give a fourth order modulus tensor as an input. Is there such a feature in AUTODYN? All that I get to see is a few subroutines such as usrstr.f90, usrero.f90 etc. In usrstr.f90, one can give only the flow stress equation, which is relevant for elasto-plastic materials. Ours is a rate dependent elastomeric material, which needs both hyperelasticity and viscoelasticity.nnCan one of you please help us?n
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