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

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material Ar real
stress linear
modulus 0.00025
possions_ratio 0.25
end
mass_density
body_force
end
material cubic real
stress cubic
c11 0.00030
c12 0.00010
c44 0.00010
end
mass_density
body_force
end
material damped real
stress damped_cubic
c11 0.00030
c12 0.00010
c44 0.00010
gamma 0.1
end
mass_density
body_force
end