Additive and Multiplicative Plasticity Solution

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.

0 Kiranraj Shetty over 6 years ago

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 yupiter.manurung over 6 years ago

Thank you for your reply.

How to define in MSC Marc?
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0 Kiranraj Shetty over 6 years ago

You can set it in the parameter section of Marc input file.

LARGE STRA,1: additive decomposition updated Lagrange procedure

LARGE STRA,2: multiplicative decomposition updated Lagrange procedure

LARGE STRA,4: the optimal choice of formulation flags is automatically determined by the program

Refer Vol. C - LARGE STRAIN entry for more details.
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0 yupiter.manurung over 6 years ago

Thank you very much, it helps a lot.
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