General Mechanical

General Mechanical

Plastic Strain User Defined Commands

    • drdmsthesis
      Subscriber

      Hi, 

      What are the physical interpretations of NLEPEQ and EPPLEQV_RST? Is NLEPEQ used in case of a time-history, cyclic load case as plastic strain accuumulates after every cycle? Alternatively, would EPPLEQV_RST be the equivalent plastic strain after a sub-step for a single load in a static analysis? Would that imply that a NLEPEQ and EPPLEQV_RST must give the same values in a single load, static analysis?  

      Thank you

    • Joshua Smith
      Subscriber

      Sort of, my understanding EPPLEQV_RST is the equivalent plastic strain at that point in time. NLEPEQ calculates the accumulation of plastic strain across each load step. They are typically treated as equivalent when loading increases monotonically but I suppose if you have cyclical loading, they may differ.

       

      From ASME Local Failure documentation:

    • drdmsthesis
      Subscriber

      Thanks Joshua, the available information on these UDFs are thin. 

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