Hello Everybody

Can anyone help a beginner to learn how to write a Umat/Vumat subroutine in ABAQUS step by step?

Thank you 

Hello Everybody

I can not find any theoric formula for ELPD in the ABAQUS theory manual and I need to know if we use eqivalent strees-equivalent strain and integrate to strain of fracture, does it give us plastic dissipation energy of an element?

Integrate[EQStress*d(EQStrain), {0,Fracture Strain}] ?

 Thank you all 

I need to write a Vumat subroutine in ABAQUS 6.11.1, and I dont know where should I begin from exactly? can anybody help me with the suitable version of Fortran for this version of ABAQUS and the steps I need to take for writing a SUBROUTINE in ABAQUS?

 Thank you guys