Dislocations Faster than the Speed of Sound

摘要: It is thought that dislocations cannot surpass the sound barrier at shear wave velocity because energy spent in radiation has a singularity there. Atomistic simulations show can move faster than speed of if they are created as supersonic strong stress concentration and subjected to high stresses. This behavior important for understanding low-temperature deformation processes such mechanical twinning may be relevant dynamics tectonic faults. The motion 2 times understood from linear elastic analysis, but many peculiarities dominated by nonlinear effects require realistic atomistic description.