Abstract
This study proposes to design a road support structure subjected to high-strain-rate loading occurring during vehicle collisions. The strain-rate affects both the hardening process and the material failure process. For modeling the strain-rate influence on material, various mathematical material models are used including the Johnoson-Cook model. The main goal of the study is to presenta method for determining the parameters for the Johnson-Cook damage model, a hybrid method which requires Charpy impact tests on a standard specimen with an annular notch and a series of calculations using finite element method simulating the test. The advantages of the presented method compared to existing methods are the high availability of the equipment, simple and quick processing of results and significantly lower costs.
Kurzfassung
Die diesem Beitrag zugrunde liegende Studie hatte zum Ziel, einen Weg aufzuzeigen, um Strukturen, die Beanspruchungen durch hohe Dehnraten bei Fahrzeugkollisionen ausgesetzt sind, zu unterstützen. Die Dehnrate beeinflusst beides, den Verfestigungsprozess und den Schädigungsprozess des Werkstoffes. Um den Einfluss der Dehnrate auf den Werkstoff zu modellieren, werden unterschiedliche mathematische Materialmodelle, wie beispielsweise das Johnson-Cook-Modell verwandt. Das Hauptziel der Studie bestand darin, ein Verfahren zu präsentieren, mit dem die Parameter für das Johnson-Cook-Schädigungsmodell bestimmt werden können. Hierbei handelt es sich um ein Hybridverfahren, das Kerbschlagversuche nach Charpy erfordert, und zwar mittels einer Standardprobe mit einem umlaufenden Kerb, sowie eine reihe von Berechnungen mittels der Finite Elemente Methode (FEM). Die Vorteile des hier vorgestellten Verfahrens bestehen in einer hohen Verfügbarkeit der Versuchseinrichtungen, in der einfachen und schnellen Erarbeitung der Ergebnisse und deutlich geringeren Kosten.
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