10 um x 10 um, 1GPa tensile stress, initial 5 wppm uniform hydrogen distribution in bulk 300 K, diffusion constant =10^-11, fracture toughness = 3.0 MPa m^1/2 for saturated segregation, 4.5 MPa m^1/2 for no hydrogen case. time step = 2 ms, total 2 sec
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