30-implementin…

material_stiffness_reduction.dat
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			material iterative_stiffness_reduction [
			name = test_mat_2
			rho = 2.7e-9 # density
			E = 60e9 # young's modulus
			nu = 0.3 # poisson's ratio
			Sc = 5.7e6
			prescribed_dam = 0.1
			max_damage = 0.9999
			Gf = 160
			crack_band_width = 1
			max_reductions = 10
			]