General Mechanical

General Mechanical

Why are time hardening creep models so challenging to converge sometimes?

    • John Doyle
      Ansys Employee
      The time hardening creep models can sometimes be very challenging to converge because the time component can overwhelm the stress dependence - time marches on but the material algorithm can only adjust the stress to find the correct value of creep strain. For example, if a generalized time hardening is ecr = C1*sigma*t^r, then if t^r is large the material algorithm needs for find a very small value of sigma so that the creep strain is small enough to satisfy the constitutive equation. n The general guidance is that the time hardening formulations work best in constant stress or when the loading in the simulation is close to the experimental loading.n
    • Govindan Nagappan
      Ansys Employee
      Thank you for sharing this informationn
Viewing 1 reply thread
  • You must be logged in to reply to this topic.