As solid laminate structure becomes increasingly common in primary aircraft structure, the need for accurate assessment of porosity has increased. Porosity is a known detrimental condition that affects the performance of these materials under load. The studies summarized in this paper demonstrated shortcomings in traditional and experimental approaches to porosity quantification. Known-porosity calibration specimens (so-called 'golden standards') are expensive and enable accurate quantification only if void morphology is similar to the production parts being tested. Engineered 'pseudo standards' also must replicate naturally-occurring void morphologies if a system-independent correlation to actual porosity levels is desired. Attenuation curves based on known-porosity specimens must be linked to particular transducer/instrument combinations to remain valid. Only velocity measurements seem to offer a system-independent measure of porosity content, but in this case the nominal part thickness must be known at every measurement point. Velocity measurement is practical for inspection of relatively uniform shapes such as 1- stiffeners, blade stiffeners, and hat stiffeners.
Approaches to porosity assessment in composites
Lösungsansatz zur Bewertung der Porosität in Verbundwerkstoffen
2008
8 Seiten, 5 Bilder, 21 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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