lammps/examples/USER/atc/elastic/Ar_damped.mat

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material Ar metal
stress linear
modulus 0.00025e6
possions_ratio 0.25
end
mass_density constant
density 1.01202
end
body_force
end
material cubic metal
stress cubic
c11 0.00030e6
c12 0.00010e6
c44 0.00010e6
end
mass_density constant
density 1.01202
end
body_force viscous
gamma 1e0
end
end
material damped metal
stress damped_cubic
c11 0.00030e6
c12 0.00010e6
c44 0.00010e6
gamma 0.1e3
end
mass_density constant
density 1.01202
end
body_force
end