material elastic [
	 name    = bulk
	 rho     = 2500
	 nu      = 0.29
	 E       = 70e9
#	 finite_deformation = 1
]

material cohesive_exponential [
	 name = coh1
	 sigma_c = 1.5e6
	 beta = 1
	 delta_c = 1e-4
	 exponential_penalty = true
	 contact_tangent = 1.0
]

material cohesive_exponential [
	 name = coh2
	 sigma_c = 1.5e6
	 beta = 1
	 delta_c = 1e-4
	 exponential_penalty = true
	 contact_tangent = 1.0
]

material cohesive_exponential [
	 name = coh3
	 sigma_c = 1.5e6
	 beta = 1
	 delta_c = 1e-4
	 exponential_penalty = true
	 contact_tangent = 1.0
]

material cohesive_exponential [
	 name = coh4
	 sigma_c = 1.5e6
	 beta = 1
	 delta_c = 1e-4
	 exponential_penalty = true
	 contact_tangent = 1.0
]

material cohesive_exponential [
	 name = coh5
	 sigma_c = 1.5e6
	 beta = 1
	 delta_c = 1e-4
	 exponential_penalty = true
	 contact_tangent = 1.0
]

material cohesive_exponential [
	 name = interface
	 sigma_c = 1.5e6
	 beta = 1
	 delta_c = 1e-4
	 exponential_penalty = true
	 contact_tangent = 1.0
]

mesh parameters [

     	cohesive_surfaces = coh1,coh2,coh3,coh4,coh5,interface

]