PSI - Issue 26

Victor Rizov et al. / Procedia Structural Integrity 26 (2020) 86–96 Rizov / Structural Integrity Procedia 00 (2019) 000 – 000

95

10

gF gC K K / ratio (curve 1 – at

/ gC m m

0.5

= gF

Fig. 7. The strain energy release rate in non-dimensional form plotted against

, curve 2

/ gC m m

/ gC m m

1.0

2.0

= gF

= gF

– at

and curve 3 – at

).

The strain energy release rate in non-dimensional form is plotted against d g f f / ratio in Fig. 6 at three l g f f / ratios. The ratios, d g f f / and l g f f / , characterize the continuous variation of f in the width and height directions of the beam cross-section, respectively. One can observe in Fig. 6 that the strain energy release rate increases with increasing of d g f f / and l g f f / ratios. The influence of continuous material inhomogeneity along the length of the beam on the fracture behaviour is analyzed by conducting calculations of the strain energy release rate at various gF gC K K / and gF gC m m / ratios. The results of these calculations are illustrated in Fig. 7 where the strain energy release rate in non-dimensional form is plotted against gF gC K K / ratio at three gF gC m m / ratios. The curves in Fig. 7 show that the strain energy release rate decreases with increasing of gF gC K K / and gF gC m m / ratios.

dF dC s s / ratio (curve 1 - at

/ dC f f

0.5

= dF

, curve 2 – at

Fig. 8. The strain energy release rate in non-dimensional form plotted against

/ dC f f

/ dC f f

1.0

2.0

= dF

= dF

and curve 3 - at

).