Parametes from J2 plasticity model

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Ashok
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Joined: Tue Feb 19, 2019 8:59 pm
Location: IITM

Parametes from J2 plasticity model

Post by Ashok » Mon Jun 07, 2021 11:03 pm

Hi,
Can somebody tell me about the parameters in J2 plasticity.
nDMaterial('J2Plasticity', matTag, K, G, sig0, sigInf, delta, H)

What are delta and H ?
How to calibrate them from experimental stress-strain curve ?

mhscott
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Location: Corvallis, Oregon USA
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Re: Parametes from J2 plasticity model

Post by mhscott » Tue Jun 08, 2021 9:58 am

The math equations do not render, but delta is an exponential strain hardening parameter and H is a linear strain hardening parameter

https://opensees.berkeley.edu/wiki/inde ... y_Material

For linear strain hardening, you can set delta=0 then select H to match a desired plastic stiffness like what's described here:

https://portwooddigital.com/2021/05/19/ ... libration/

Ashok
Posts: 50
Joined: Tue Feb 19, 2019 8:59 pm
Location: IITM

Re: Parametes from J2 plasticity model

Post by Ashok » Tue Jun 08, 2021 9:39 pm

Thanks a lot !
I tried it - but it shows the message:
"More than 25 iterations in constituive subroutine J2-plasticity "

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