FAILURE MODES

Glass Epoxy

Boron Epoxy

	mpa	(ksi)
	139	20
	278	40
	405	59
	417	60
X-radiographs of a [0/904]scarbon/epoxy laminate under uniaxial tensile loading at various applied stress levels.

Fracture surfaces of [±20]_s laminate under axial tensile loading.

Failure patterns of boron/epoxy panels with hole having the same layup but different stacking sequences

Failure pattern in carbon/epoxy specimen with 1.91 cm (0.75 in.)
hole under equal biaxial tensile loading.