changes-to…

material.dat
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			material elastic [
			name = upper
			rho = 1.0 # density
			E = 1e3 # young's modulu
			nu = 0.3 # poisson's ratio
			]

			material elastic [
			name = lower
			rho = 1.0 # density
			E = 1e3 # young's modulu
			nu = 0.3 # poisson's ratio
			]

			contact_detector [
			type = explicit
			master = contact_bottom
			slave = contact_top
			projection_tolerance = 1e-10
			max_iterations = 100
			extension_tolerance = 1e-5
			]

			contact_resolution penalty_linear [
			name = contact_top
			mu = 0.0
			epsilon_n = 4e5
			epsilon_t = 1e5
			is_master_deformable = false
			]