PSI - Issue 25

Victor Rizov / Procedia Structural Integrity 25 (2020) 88–100 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 11. The strain energy release rate in non-dimensional form plotted against the non-dimensional time (curve 1 – at /

0.5 3 1    , curve 2

/ 1.0 3 1    and curve 3 - /

2.0 3 1    ).

– at

2 1 / E E ratio. It should be

The curves in Fig. 9 show that the strain energy release rate decreases with increasing of

0  t (Fig. 9) is due to the instantaneous elastic strain that is simulated

noted that the strain energy release rate at

j E (Fig. 1c).

by the spring

Fig. 12. The strain energy release rate in non-dimensional form plotted against the bending moment, M (curve 1 – obtained by the viscoelastic model shown in Fig. 1d, curve 2 - obtained by to the viscoelastic model shown in Fig. 1a, curve 3 - obtained by the viscoelastic model shown in Fig. 1c and curve 4 - obtained by the viscoelastic model shown in Fig. 1b). 1 3 / p p E E ratios on the delamination fracture behaviour is evaluated too. The rheological model shown in Fig. 1c is applied. The beam with a delamination crack located between layers 2 and 3 is analyzed (Fig. 4a). The strain energy release rate in non-dimensional form is plotted against 1 3 / p p   ratio in The effect of 1 3 / p p   and