def __init__(self, PD_deck, PD_problem, y):
self.len_x = len(PD_problem.x)
self.Modulus = PD_deck.get_elastic_material_properties()
self.compute_ext_state(PD_deck, PD_problem, y)
self.compute_ext_state(PD_deck, PD_problem, y )
self.compute_T(PD_deck, PD_problem, y)
self.compute_Ts(PD_deck, PD_problem)
