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Additive and Multiplicative Plasticity Solution

yupiter.manurung
I am trying to simulate "Forming to Welding" and "Welding to Forming". I heard that we have to do Additive Plasticity Solution for "Forming to Welding" and Multiplicative Plasticity Solution for "Welding to Forming". My questions are:
 
(1) What do these (Additive and Multiplicative Plasticity Solution) mean actually? Do we need to use this?
(2) How to do that in MSC Marc?
 
Thank you.
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    Additive Decomposition , This is an incremental approach where ,
    total incremental strain = incremental thermal strain + incremental elastic strain + incremental plastic strain
     
    In Multiplicative Decomposition, the strain measure is based on the deformation gradient
     
    F = Fe * F(theta) * Fp
     
    where F(theta) is the thermal deformation gradient,
    Fe is the elastic deformation gradient and
    Fp is the plastic deformation gradient.
     
    When there is no plasticity (e.g. rubber elasticity), Fp is unity.
     
    In the .out file you can see which method has been used.
     
    You can set the plasticity procedure in Mentat under job properties >Large strain > Advanced options > Updated Lagrange > Plasticity procedure.
     
    Or in marc input file use propitiate value for N in LARGE STRA, N card
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  • 0
    Additive Decomposition , This is an incremental approach where ,
    total incremental strain = incremental thermal strain + incremental elastic strain + incremental plastic strain
     
    In Multiplicative Decomposition, the strain measure is based on the deformation gradient
     
    F = Fe * F(theta) * Fp
     
    where F(theta) is the thermal deformation gradient,
    Fe is the elastic deformation gradient and
    Fp is the plastic deformation gradient.
     
    When there is no plasticity (e.g. rubber elasticity), Fp is unity.
     
    In the .out file you can see which method has been used.
     
    You can set the plasticity procedure in Mentat under job properties >Large strain > Advanced options > Updated Lagrange > Plasticity procedure.
     
    Or in marc input file use propitiate value for N in LARGE STRA, N card
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