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Licensed Unlicensed Requires Authentication Published by De Gruyter September 26, 2018

Determination of the Johnson-Cook damage parameter D4 by Charpy impact testing

Bestimmung des Johnson-Cook Schädigungsparameters mittels Kerbschlagversuchen
Michał Stopel, Dariusz Skibicki and Artur Cichański Bydgoszcz
From the journal Materials Testing

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.


*Correspondence Address, Prof. Dr. Dariusz Skibicki, UTP University of Science and, Technology in Bydgoszcz, Kaliskiego 7, 85-796 Bydgoszcz, Poland, E-mail:

MSc Eng. Michał Stopel obtained his basic education in the area of Mechanical Engineering at the University of Science and Technology in Bydgoszcz, Poland in 2013. He started to work on his PhD thesis in the field of Machine Construction. He is particularly interested in dynamic loads and strain-rate dependent materials. He is an assistant at the University of Bydgoszcz in Poland, where he deals mainly with CAD and FEM problems.

Prof. Dr. Eng. Dariusz Skibicki, born in 1967, obtained his basic education in the area of Mechanical Engineering at the University of Science and Technology in Bydgoszcz, Poland in 1992. He started working on materials fatigue in 2000 when defending his PhD thesis. After receiving his doctorate degree, his scope of interest has been enlarged by encompassing materials fatigue and problems of loading nonproportionality. He also deals with the strain-rate influence of load on the strength properties of metals. Presently, he is Asociated Professor at the University of Bydgoszcz in Poland.

Dr. Eng. Artur Cichański, born in 1967, obtained his basic education in the area of Mechanical Engineering at the University of Science and Technology in Bydgoszcz, Poland in 1992. In 2000, he defended his PhD thesis concerning issues of material fatigue. Currently, he is an assistant professor at the University of Bydgoszcz in Poland. His main field of interest is FEM modelling of machine elements and trabecular bone structures.


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Published Online: 2018-09-26
Published in Print: 2018-10-27

© 2018, Carl Hanser Verlag, München