material viscoelastic_maxwell [
	 name = anything
	 rho  = 7800     # density
	 Einf = 15e6      # young's modulus
	 nu   = 0.0     # poisson's ratio
	 Eta = [40e6]       # viscosity
         Ev  =[10e6]      # viscous stiffness
	 Plane_Stress = 0
]