Multilinear Isotropic Hardening

- June 22, 2022 at 1:10 pm
  
  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 [
  " rel="nofollow noopener noreferrer" target="_blank">https://
  " rel="nofollow noopener noreferrer" target="_blank">
  ], 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 [

" rel="nofollow noopener noreferrer" target="_blank">

], 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? Or should I use (0, yield strength) even though this value is 0.002?

Regards, Albin

June 22, 2022 at 1:42 pm

Subashni Ravichandran

Ansys Employee

Albin Linderstam

This Forum is meant for support on Ansys Discovery products only. For queries related to other Ansys products please post them on Ansys Customer Portal

June 22, 2022 at 1:48 pm

albin.linderstam
Subscriber

Subashni Oh sorry! I'm a bit confused of all forum updates lately.

Viewing 1 reply thread

You must be logged in to reply to this topic.

Ansys Innovation Space

Boost Ansys Fluent Simulations with AWS

Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.

Earth Rescue – An Ansys Online Series

The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog

Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.

Trending discussions