I am new to UMAT in Abaqus and want to create UMAT for "shell" elements for an isotropic and anisotropic material, can anyone suggest any reference material, book, or website link which can help me.
also, watch this demo: https://www.youtube.com/watch?v=96sfwnvLHkA
This package contains tutorial videos for the UMAT subroutine, required files for the modeling and writing of the subroutine, examples of isotropic materials and shell elements, etc.
And if your model is orthotropic, and shell element or continuum shell or anything than 3D continuum solid, check the link below: