code: def elasprepFD(self):
      
      self.dx4 = self.dx**4
      self.D = self.E*self.Te**3/(12*(1-self.nu**2))
docs: dx4, D = elasprepFD(dx,Te,E=1E11,nu=0.25)
      
      Defines the variables (except for the subset flexural rigidity) that are
      needed to run "coeff_matrix_1d"