General Mechanical

General Mechanical

Is it possible to change the formulation to determine the equivalent SIF to a custom one?

    • Paul_Loeps
      Subscriber

      Hello reader,

      as written in the header, I want to use a custom formulation to determine the equivalent SIF and the crack-growth direction for a 2D mixed mode. Is it possible to change the formulations which are used by ANSYS?

      Thanks in advance.

    • Daniel Shaw
      Ansys Employee
      No. MAPDL uses the integration integral method to calculate the SIFs. You cannot specify a different method. See Section 2.4.2.4 in the MAPDL Fracture Analysis Guide.
      You can create a user defined crack-growth law. See Section 3.1.3.4 in the MAPDL Fracture Analysis Guide.
    • Paul_Loeps
      Subscriber
      Thanks for the fast answer Daniel.
      I don't want to change the method each SIF is calculated but the method how ANSYS calculates the averaged SIF. As much as I know, in the current version ANSYS calculates the equivalent SIF with the following equation:
      An determines the angle of the crack growth by:
      I want to change these two to the criterion formulated by Richard:
      I don't know whether it is possible to change it in an easy way or find the formulation in the related file.
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