![]() However, the case represents a more realistic situation with the plastic zone accumulating in the wake of the growing crack. Hence, the calculations are somewhat tedious and become intensive as the crack grows with changing glide to cleavage components depending on μ and the surface energy of the material. For most cases, depending on the value of μ, the emission of the second dislocation is prevented due to the back stress from the previously emitted dislocation. The same test is again done for the emission of the second dislocation on the glide plane, in contrast to further crack extension as an elastic crack. If the energy for emission is lower, then the crystal dislocation on the glide plane is allowed. further crack extension as a cleavage crack. Hence, during the calculations, at each crack increment, the total energy is compared for dislocation emission vs. The continuous elastic-plastic crack, on the other hand, starts emitting crystal lattice dislocations as it grows.
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