In the works devoted to crack growth kinetics and the failure conditions in solid bodies, including the case of environment-induced cracking, one may find that the crack growth speed v in treated as if it is the function of the stress intensity factor (SIF) K at the crack tip. Such dependence is often shown on the graphs in K-v plane which are known for a wide range of experimental objects including silicate glass [1, 2, 3, 5] and solid metals embrittled by liquid metals [6, 7, 8, 9]. In the same manner, the criterion for crack starting or fracture can be given as K > Kcrit. In above cases, the SIF at the crack tip is treated as a sole parameter influencing crack behaviour. The SIF is then calculated using well-known solutions based on continuum mechanics. For a typical case of type I loading it gives
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