A study of Mode-I delamination cracks by high-magnification moiré interferometry

• Delamination cracks in carbon-fibre/epoxy composites loaded in Mode-I have been studied by high-magnification moiré interferometry. The moiré interferometer has the capability of switching between laser illumination for acquiring the displacement field and white-light illumination for visualisation of the underlying microstructure. Four specimens with different stacking geometries have been investigated. The delamination cracks have been simulated by using Teflon films. The resulting displacement fields have been compared to numerical solutions calculated by the finite-element method. The comparisons indicate that the Teflon films for some of the specimens did not delaminate fully. Otherwise the agreement is good, confirming that the displacement field around such cracks is satisfactorily described by linear-elastic fracture mechanics. The agreement was improved when a matrix-rich region in front of the crack tip was included in the finite-element model.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Teknisk mekanik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Applied Mechanics (hsv//eng)

Nyckelord

Experimentell mekanik

Experimental Mechanics

Publikations- och innehållstyp

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