The reliability of impact simulations for aircraft components made with triaxial braided carbon fiber composites is currently limited by inadequate material property data and lack of validated material models for analysis. Improvements to standard quasi-static test methods are needed to account for the large unit cell size and localized damage within the unit cell. The deformation and damage of a triaxial braid composite material was examined using standard in-plane tension, compression, and shear tests. Some modifications to standard test specimen geometries are suggested, and methods for measuring the local strain at the onset of failure within the braid unit cell are presented. Deformation and damage at higher strain rates is examined using ballistic impact tests on 61 cm (24 in) x 61 cm (24 in) x 3.2 mm (0.125 in) composite panels. Digital image correlation techniques were used to examine full field deformation and damage during both quasi-static and impact tests. An impact analysis method is presented that utilizes both local and global deformation and failure information from the quasi-static tests as input for the material model. Improvements that are needed in test and analysis methods for better predictive capability are examined.
Characterization of triaxial braided composite material properties for impact simulation
Kennzeichnung der Materialeigenschaften von dreiachsig umflochtenem Verbundwerkstoff für Stoßsimulationen
AHS International, Annual Forum, 65 ; 2507-2528
2009
22 Seiten, 32 Bilder, 4 Tabellen, 26 Quellen
Aufsatz (Konferenz)
Englisch
Characterization of Triaxial Braided Composite Material Properties for Impact Simulation
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