Abstract
Small mass impacts pose a threat to modern lightweight materials even at low velocities. In this study we describe a test method with a suitable setup to access the materials impact response to masses below 500 g and velocities up to 20 m/s. The setup uses a highspeed camera and adapted semi-automatic image processing algorithms to extract the time-force history of the indenter. The results show good agreement to analytical impact models for hollow core sandwich structures.
Kurzfassung
Kugeleinschlagversuche an Sandwich-Strukturen bei geringen Stoßkörpermassen. Auch bei niedrigen Geschwindigkeiten stellt der Einschlag von geringen Massen eine hohe Belastung für Bauteile aus modernen Leichtbauwerkstoffen dar. In der diesem Beitrag zugrunde liegenden Studie werden eine Prüfmethode und Prüfeinrichtung beschrieben, mit der das Werkstoffverhalten beim Einschlag von Massen unter 500 g mit einer Geschwindigkeit von bis zu 20 m/s charakterisiert werden kann. Im Prüfaufbau kommen eine Hochgeschwindigkeitskamera sowie Bildverarbeitungsalgorithmen zum Einsatz, die es erlauben den Zeit-Kraft-Verlauf des Eindringkörpers zu ermitteln. Die Ergebnisse weisen eine gute Übereinstimmung mit analytischen Modellen zur Simulation des Einschlages in Sandwich-Strukturen aus Honeycomb-Materialien auf.
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