The experimentally established dependence of the critical crack-tip opening displacement on the type of loading [1,2] indirectly shows that the crack-tip opening displacement also depends on the type of loading. The analytic representation of the crack-tip opening displacement for the case of uniaxial tension of a plate is well-known [3]. In what follows, we present a theoretically substantiated relation taking into account the influence of the biaxiality of loading on the crack-tip opening displacement. The influence of the biaxiality of loading on K_I is studied in [4].
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