Crack Paths 2009

Delamination Damage

To model the delaminated cantilever beam, a section of the beam is given a reduced

flexural rigidity, as seen in Fig 6. Figures 7 to 9 illustrate the effect of varying

parameters on the acquired strain compatibility along the delaminated cantilever beam.

Firstly, the effect of incremental damage severity in the delaminated zone (Fig. 7),

secondly, the effect of the number of measurement points used to determine the least

squares fit of the out-of-plane displacement (2n + 1) (Fig. 8), and finally, the effect of

incremental growth of the delaminated section (Fig. 9). Table 2 details the specific

parameters use in each figure.

(b)

(a)

Figure 6. (a) Physical and (b) approximated model of the delaminated cantilever beam.

Table 2. Parameter used in Figs 7 to 9.

Figure

E2I2/E1I1

n

La/L

L b /L

0.4

7

0.8, 0.65 & 0.5

100

0.5

50, 100 &150 0.4

8

0.65

0.5

9

0.65

100

0.4

0.41, 0.45 & 0.5

(a)

(b)

(c)

Figure 7. Acquired strain compatibility (∆i) at a range of locations along the

delaminated cantilever beamfor three different reductions in modulus of elasticity and

momentof inertia in the delaminated section (E2I2/E1I1).

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