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material_orthotropic.dat
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			material elastic_orthotropic [
			name = test_mat_1
			rho = 3.8328782866680342684 # density in g/mol/A^2
			E1 = 10. # young's in kcal/mol/A^3
			E2 = 1. # young's in kcal/mol/A^3
			nu12 = 0.33333333333333333333 # poisson's ratio
			G12 = 3.6702824005625512938 # shear modulus in kcal/mol/A^3
			]