Generation of R-Curve from 4ENF Specimens: An Experimental Study

Table 2

Influence of inner span on critical mode II interlaminar fracture toughness of carbon/epoxy 4ENF specimens.

Method	Inner span (mm)	(kJ/m^2)
		NL	5% or max	Propagation
4ENF [39]	50	0.682	0.902	1.002
	70	0.854	1.011	1.047
4ENF [12]	50	0.525	0.692	0.767
	70	0.563	0.666	0.690
SENF [24, 25]		1.041	1.261	1.225