Multilinear Isotropic Hardening

- June 23, 2022 at 6:51 am
  
  albin.linderstam
  Subscriber
  
  Hello,
  I want to perform a analysis of a component using Plasticity.
  I’ve have a stress-strain curve from MMPDS, see attached image. According to MMPDS, the curve is a Engineering Stress-Strain.
  We have used similar analysis a long time ago, but that was in Ansys R15.0. However, in that version, the Total Strain was entered instead of Plastic Strain, see attached image.
  I’ve some questions regarding this; especially about preparding the correct table to input in Ansys
  1. Ramberg-Osgood Equation: I have E, Fty and n (see attached image), so I simply try to create a lot of stress-strain values from this equation using this parameters, but I don’t get the correct values. Is the method correct? In the second attached image, I show my values from this equation and parameters. According to the graph, 169ksi should give ~0.011, but I get ~0.085, so I’m way off. Cannot find out why.
  2. According to [
  ">https://
  ">
  ], True Stress-Strain is required; should I convert from Engineering to True stress-strain using the equations in attached image and then subtract the elastic strain (s/E) to only get the plastic strain?
  3. According to [

], the first point should be (0, yield strength), but how should I then include 0.2% plastic strain at yield point? There is a parameter called Offset, but I cannot modify the values. Should this parameter be used somehow?

Regards,

Albin

June 23, 2022 at 9:41 am

Erik Kostson

Ansys Employee

Hi Albin since you are a supported user plese create a support request (https://support.ansys.com/) and we will help you there with all these questions.

Closing this one here

All the best

Erik Kostson

June 23, 2022 at 9:43 am

Erik Kostson

Ansys Employee

@Peteroznewman this one is closed – supported user will recieve support via a proper channel.

June 23, 2022 at 9:51 am

Erik Kostson

Ansys Employee

Closed.

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