| This paper investigates the change in stress fields at crack tips in alkali-halide crystals under the influence of electromagnetic radiation in visible, ultraviolet and X-ray wavelength ranges. It is shown that electromagnetic radiation causes the relaxation of mechanical stress in crack tips. The relaxation is caused by reversible motion of dislocations into a crack cavity. It is established that the largest stress relaxation is observed under the influence of X-ray radiation. |
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