# 4.38. Modular Failure

The modular failure capability consists of a suite of failure models (Tearing Parameter, Johnson-Cook Failure, Wilkins, Modular Failure, Modular BCJ Failure) that are available to several of modular material models. These failure models are briefly defined in this chapter, but other references (e.g. [[1], [2], [3]]) provide a more complete description. Modular failure is currently available to the following material models: J2 plasticity, Hosford plasticity, Hill plasticity, and Barlat plasticity.

Additionally, an anisotropic failure capability has been implemented (Section 4.38.6). This is compatible with the modular failure models listed here, plus several additional models in development.

    #
    # Optional Failure Definitions
    #    Following only need to be defined if intend to use failure model
    #
    FAILURE MODEL = TEARING_PARAMETER | JOHNSON_COOK_FAILURE | WILKINS
                    | MODULAR_FAILURE | MODULAR_BCJ_FAILURE

    CRITICAL FAILURE PARAMETER = <real>

[1]

Edmundo Corona and Benjamin Reedlunn. A review of macroscopic ductile failure criteria. Technical Report SAND2013-7989, Sandia National Laboratories, Albuquerque, NM and Livermore, CA, 2013.

[2]

B.T. Lester and W.M. Scherzinger. Failure formulations in modular plasticity models. Memo to distribution SAND2019-9678R, Sandia National Laboratories, Albuquerque, NM and Livermore, CA, 2019.

[3]

B.T. Lester and W.M. Scherzinger. Modular growth and nucleation formulations in modular plasticity models. Memo to distribution SAND2020-7404R, Sandia National Laboratories, Albuquerque, NM and Livermore, CA, 2020.