Material Question

[davidrudlstorfer]

class MaterialEulerBernoulli(_MaterialBeamBase):
    """Holds material definition for Euler Bernoulli beams."""

    def __init__(self, **kwargs):
        super().__init__(
            material_string="MAT_BeamKirchhoffTorsionFreeElastHyper", **kwargs
        )

    def dump_to_list(self):
        """Return a list with the (single) item representing this material."""
        area, mom2, _, _ = self.calc_area_stiffness()
        if self.area is None and self.mom2 is None:
            area, mom2, _, _ = self.calc_area_stiffness()
        elif self.area is not None and self.mom2 is not None:
            area = self.area
            mom2 = self.mom2
        else:
            raise ValueError(
                "Either all relevant material parameters are set "
                "by the user, or a circular cross-section will be assumed. "
                "A combination is not possible"
            )
        data = {
            "YOUNG": self.youngs_modulus,
            "DENS": self.density,
            "CROSSAREA": area,
            "MOMIN": mom2,
        }
        return {"MAT": self.i_global + 1, self.material_string: data}

@isteinbrecher @ALL is it correct that this material is called MaterialEulerBernoulli but the actual material is BeamKirchhoffTorsionFreeElastHyper? I'm unfortunately a bit clueless here

[isteinbrecher]

Yes that is correct. The corresponding beam elements are called BEAM3EB. I think this is for historic reasons, but the commonly used name for these beam elements in the people using 4C is Euler-Bernoulli. From a theory point of view these are torsion free KL beam elements.