The study of bi-material notches is becoming a topical problem as they can model
geometrical or material discontinuities efficiently. Assessing the conditions for crack initiation in bimaterial
notches makes it necessary to calculate the generalized stress intensity factors H. In
contrast to the determination of the K factor for a crack in an isotropic homogeneous medium, for
the ascertainment of a generalized stress intensity factor (GSIF) there is no procedure incorporated
in the calculation systems. The calculation of these fracture mechanics parameters is not trivial and
requires certain experience. Nevertheless, the accuracy of the H-factor calculation directly
influences the reliability of the assessment of the singular stress concentrators. Direct methods of
the estimation of H factors usually require choosing the length parameter entering into the
calculation. Two types of direct methods of calculating the GSIFs are presented, tested and mutually
compared. Recommendations for reliable estimation of H factors are suggested.
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