PSI - Issue 13

Ivan Shatskyi et al. / Procedia Structural Integrity 13 (2018) 1476–1481 Author name / Structural Integrity Procedia 00 (2018) 00 – 000

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Fig. 1. Forces and moments intensity factors for dyads of parallel defects: 1 – “slit–slit”, 2, 3 – “slit–crack”, 4 – “crack–crack”

Fig. 2. Distribution of contact forces on closed edges of the crack: ( а ) – “crack–slit”, ( b ) – “crack–crack”; t=x/l

4. Conclusions

The suggested calculation scheme allows researching the effects of interaction of contact cracks and narrow slits within the classic theory of plates. For the pair of interacting defects of varying nature it has been determined that closure of a crack increases the bending moments intensity in the neighbourhoods of the peaks of the crack, and also it produces coefficients of intensity of membrane forces in the tips of the defects in comparison with the case of two slits. The presence of the slit reinforces the stress field in the neighbourhoods of the crack in comparison with the case of two cracks, which is