PSI - Issue 25

Victor Rizov / Procedia Structural Integrity 25 (2020) 88–100

95

Author name / Structural Integrity Procedia 00 (2019) 000 – 000

8

the layers is q in both configurations. It is assumed that

0.008  q m and

4  M Nm. In the

0.020  b m,

first beam configuration, a delamination crack is located between layers 2 and 3 (Fig. 4a).

2 1 /   ratio (curve 1 - at /

0.5 3 1    , curve 2 – at

Fig. 6. The strain energy release rate in non-dimensional form plotted against

/ 1.0 3 1    and curve 3 – at /

2.0 3 1    ).

A delamination crack located between layers 1 and 2 is also analyzed (Fig. 4b). The strain energy release rate is presented in non-dimensional form by using the formula   G G E b N 1 /  .

Fig. 7. The strain energy release rate in non-dimensional form plotted against the non-dimensional time (curve 1 – at /

0.5 1   , curve  p

p

2

/

1.0 1   and curve 3 – at  p

/

2.0 1   ).  p

2 – at

p

p

2

2

The effect of the crack location is shown in Fig. 5 where the strain energy release rate in non-dimensional form