Discussion on the use of the strain energy release rate for fatigue delamination characterization

Cyclic-fatigue crack growth in composite and adhesively-bonded structures: The FAA slow crack growth approach to certification and the problem of similitude

“…In this context a recent paper [49] has shown that for the delamination growth in composites the da/dN versus ΔG curves can also be a function of the initial damage size. To illustrate this effect in [49] test data associated with delamination growth in CFRP specimens at an R= 0.…”

“…To illustrate this effect in [49] test data associated with delamination growth in CFRP specimens at an R= 0. Figure 18 Plot of da/dN versus ∆� for delamination growth in DCB tests using an unidirectional CFRP laminate for three different initial sizes of delamination [ 49].…”

Fatigue delamination of composite materials – approach to exclude large scale fibre bridging

“…1.E-06 development of fibre bridging [21]. The increase of fibre bridging in newly created crack lengths is compensated by the pull-out and failure of bridging fibres at the pre-crack side.…”

“…One should note that the length of the DCB specimen should be sufficiently long to extract at least six to seven curves from that specimen. This could be equivalent to about 70 mm crack extension range [21] [22]. Here, it is recommended to adopt the specimen geometry described in [21] [22], in which the test procedure has been explained before.…”

A model for cathodic blister growth in coating degradation using mesomechanics approach

“…The mode adjusted driving force F for crack propagation depends on the elastic energy release rate G and a dimensionless mode mix function f c ð Þ [58],…”