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Question reg ABAQUS-VUMAT and Updated Lagrangian formulation.

Hello all,

I am working on implementing a viscoelastic constitutive model from a hyperelastic stored energy potential (for finite-elasticity) and a dissipation potential (for the viscouls evolution). The elastic constitutive relation, hence derived from the stored energy potential is rate-independent and it is expressed as T(Cauchy's Stress) = f(B), where B is the Left-cauchy green deformation tensor.

The evolution equation is derived out in an objective rate form, which I am integrating over time using a 2nd order accurate explicit method.

My question:

1. How does I let ABAQUS know/(How do I toggle) to use Updated Lagrangian formulation, given that I code my constitutive relation in the format mentioned above?

 

Thank you.

Srikanth

Research Scholar

Department of Mechanical Engineering

IIT Madras, India.

Is updated lagrangian formulation automatically toggled while solving in ABAQUS/Explicit wherein NLGEOM is ON by default? 

 

Regards.

Srikanth 

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