Three types of polycrystalline graphites, the size of which is 65 mm in diameter and 30 mm in thickness, are impacted by a 4 mm diameter steel sphere accelerated from 1200 m/s to 1900 m/s. Spallation on the back-surface of them were observed by a high speed shutter camera. After ejection of smaller fragments from the central parts, larger fragments of periphery are ejected. The fracture behavior depends on specimen's properties or microstructures. When the projectile does not penetrate through the specimens, specimen shows different fracture. The penetration of a projectile must play an important role on crack initiation and on fragment ejection. Spall area could be affected by graphite's particle size and their effective fracture energy.
High speed observation of impact fracture of carbon materials
Time Dependent Mechanical Response of Engineering Ceramics, Yamazaki International Symposium, 2 ; 121-124
1999
4 Seiten, 1 Bild, 1 Tabelle, 3 Quellen
Aufsatz (Konferenz)
Englisch
Graphit , polykristalliner Stoff , Dicke , Stoß (Schlag) , Abplatzen , Rückseite , Hochgeschwindigkeitsphotographie , Materialbruch , Eindringen , Risseinleitung , Korngröße , Bruchenergie , Geschwindigkeit , Anwendung in der Luft- und Raumfahrt , Schadenanalyse , Fraktographie , Bruchgefüge , Aufprall , angerissene Oberflächenschicht
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