@staticmethod
def plastic_table(nominal=None):
    """
        Plasticity tables.

        Tables with plastic stress-strain curve values for different steels
        given a steel name, e.g 'S355'

        Parameters
        ----------
        nominal : string [optional]
            Steel name. Default value, 'S355'

        Attributes
        ----------

        Notes
        -----

        References
        ----------

        """
    if nominal is None:
        nominal = 'S235'
    if nominal is 'S355':
        table = (381.1, 0.0), (391.2, 0.0053), (404.8, 0.0197), (418.0, 0.0228
            ), (444.2, 0.031), (499.8, 0.0503), (539.1, 0.0764), (562.1, 0.1009
            ), (584.6, 0.1221), (594.4, 0.1394), (5961, 1.0)
    if nominal is 'S650':
        table = (760.0, 0.0), (770.0, 0.022), (850.0, 0.075), (900.0, 0.1), (
            901.0, 1.0)
    return table
