PSI - Issue 28

Victor Rizov et al. / Procedia Structural Integrity 28 (2020) 1212–1225 Author name / Structural Integrity Procedia 00 (2019) 000–000

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It is useful to compare the longitudinal fracture behaviour of the beam obtained by using the two viscoelastic models shown in Fig. 2 at a given value of time.

0.4  s , curve 2 – at

0.6  s

Fig. 6. The strain energy release rate in non-dimensional form presented in a function of n (curve 1 – at

and curve 3 – at 0.8  s ). For this purpose, the strain energy release rate in non-dimensional form obtained by the two models is presented in a function of 3 1 / R R ratio in Fig. 8 (it should be noted that 3 1 / R R ratio characterizes the location of the crack in radial direction).

0.6  m , curve 2 – at

0.7  m

Fig. 7. The strain energy release rate in non-dimensional form presented in a function of h (curve 1 – at

and curve 3 – at 0.8  m ). One can observe in Fig. 8 that the strain energy release rate obtained by using the viscoelastic model shown in Fig. 2b is higher compared to that found by the viscoelastic model shown in Fig. 2a. The curves shown in Fig. 8 indicate also