Acoustic Emission Monitoring of Carbon Fibre Reinforced Composites with Embedded Sensors for In-Situ Damage Identification

Piezoelectric sensors can be embedded in carbon fibre-reinforced plastics (CFRP) for continuous measurement of acoustic emissions (AE) without the sensor being exposed or disrupting hydro- or aerodynamics. Insights into the sensitivity of the embedded sensor are essential for accurate identification of AE sources. Embedded sensors are considered...

Free edge delamination in carbon-epoxy laminates: A novel numerical/experimental approach

Effect of cooling rate on interlaminar fracture energy and shear strength of APC-2 laminates

The effect of cooling rate on some mechanical properties of APC-2/AS4 composite was investigated over the range between 1 and 70° C/min. Preconsolidated unidirectional laminates were reprocessed in a hot platen press at controlled cooling rates. Double Cantilever Beam specimens and End Notch Flexure specimens were used to determine the mode I...

A non-linear finite element approach for the analysis of mode-I free edge delamination in composites

Garteur compression behaviour of advanced CFRP

The susceptibility of currently used CFRP to impact damage has stimulated the development of improved composites. This new generation of composites usually shows increased toughness and damage tolerance as well as improved tensile performance. This is generally not matched, however, by a similar improvement in compressive properties which then...

Hygrothermal Effects in Continuous Fibre Reinforced Composites: Part I: Thermal and Moisture Diffusion in Composite Materials

This report is the first in a series of literature reviews in which hygrothermal effects on aerospace composite materials (CM) are examined. This first report (Part I) deals primarily with fundamental aspects of the diffusion of moisture into, and from, composite materials. The effects of temperature under both steady state and transient...

Flight simulation fatigue crack propagation in metal/carbon-epoxy laminates

Flight simulation fatigue crack propagation tests with gust spectrum loading were carried out on laminates of (i) aluminium alloy 2024-T3/carbon-epoxy, (ii) aluminium alloy 7475-T761/carbon-epoxy and (iii) titanium alloy Ti-6Al-4V/carbon-epoxy with nominal weight savings of 30% and 40% as compared to equivalent 2024-T3 Alclad and 7475-T761...

A short note on the interpretation of X-ray radiographs of carbon fibre reinforced composites

The present report describes the X-ray radiography and subsequent destructive investigation according to metallographic techniques of specimens that were taken from experimental mixed—laminate test panels. Clues for the interpretation of radiopraphs of carbon fibre reinforced composites are given.

Thermal conductance measurement of honeycomb sandwich panels with carbon fibre reinforced plastic face sheets

Determination of the thermal conductivity of carbon fibre reinforced plastic sheet material