Writing UMAT subroutine for vesco elastic material i.a Asphalt concrete

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Writing UMAT subroutine for vesco elastic material i.a Asphalt concrete

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Hi all,
      I am writing umat subroutine for asphalt concrete i.e vesco elastic material. I am done with the elastic part but dont know how to write the vesco elastic part. If anyone know the matrices needed for the 2nd portion or anything else that could help me in writing it, just forward it to me.
I will be very thankful.
Regards...