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Method for determining the strain rate sensitivity factor for the Johnson-Cook model in Charpy tests

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Published/Copyright: November 21, 2017
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Materials Testing
From the journal Materials Testing Volume 59 Issue 11-12

Abstract

The basis for the study was the necessity to design a supporting structure of the road infrastructure subjected to high strain rates occurring during vehicle accidents. Mathematical models of hardening due to the high strain rates are reviewed. Commonly used methods for determining constants for one of the models, i. e., Johnson-Cook model are characterized. The main section of the study presents a proposed method for determining the strain rate sensitivity of the material. It is a hybrid method which requires Charpy tests using unnotched specimens and a series of calculations using the finite element method to simulate the tests. Several variants of strain measurement of specimen subjected to failure in Charpy tests, as required for the proposed method are analyzed. Using the suggested method, a strain rate sensitivity factor was obtained with a value similar to the value obtained using the split Hopkinson pressure bar technique. The advantages of the suggested method compared to the existing methods are the high availability of the instruments, simple and quick processing of the results and significantly lower costs.

Kurzfassung

Die Basis für die diesem Beitrag zugrunde liegende Studie bestand in der Notwendigkeit, eine Stützstruktur für die Fahrbahninfrastruktur auszulegen, die hohen Dehnraten infolge von Fahrzeugunfällen ausgesetzt ist. Mathematische Modelle der Verfestigung aufgrund der hohen Dehnraten werden überprüft. Die gewöhnlich angewandten Verfahren zur Bestimmung der Konstanten für eines der Modelle, dem Johnson-Cook-Modell, werden charakterisiert. Der Hauptteil der Studie stellt ein propagiertes Verfahren vor, um die Dehnratensensitivität des Werkstoffes zu bestimmen. Hierbei handelt es sich um ein Hybridverfahren, das Charpy-Tests mit einer ungekerbten Probe und eine Reihe von Berechnungen unter Verwendung der Finite Elemente Methode erfordert, um den Versuch zu simulieren. Verschiedene Varianten der Dehnungsmessung der Proben, die einem Versagen im Charpy-Test ausgesetzt waren und die für das propagierte Verfahren erforderlich waren, werden analysiert. Unter Anwendung des vorgeschlagenen Verfahrens wurde ein Faktor der Dehnratensensitivität ermittelt, der einen Wert ähnlich dem Wert hat, der mittels des Split-Hopkinson-Versuches erhalten wurde. Der Vorteil des vorgeschlagenen Verfahrens im Vergleich zu existierenden Verfahren besteht in der hohen Verfügbarkeit der Instrumente, einer einfachen und schnellen Verarbeitung der Ergebnisse und signifikant niedrigeren Kosten.

*Correspondence Address, Prof. Eng. Dariusz Skibicki, UTP University of Science and Technology in Bydgoszcz, Kaliskiego 785-796 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 interested in particular 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. Eng. Dariusz Skibicki obtained his basic education in the area of Mechanical Engineering at the University of Science and Technology in Bydgoszcz, Poland in 1992. He started to work on multiaxial fatigue of materials in 2000 and defended his PhD. After receiving the doctorate degree, his scope of interest has been enlarged by encompassing the fatigue of materials with problems of defining nonproportionality measures. Now, he is Assistant Professor at the University of Bydgoszcz in Poland, where he deals mainly with FEM problems.

Prof. Eng. Wojciech Moćko obtained his basic education in the area of Electronics at Warsaw University of Technology, Poland in 2004. In 2008, he defended his PhD thesis with the title “Application of Image Sensors for Colorimetric Analysis”. He is an employee of the Institute of Motor Transport since 2003. Currently, he is working at ITS Material Research Center, Warsaw, Poland.

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Published Online: 2017-11-21
Published in Print: 2017-11-15

© 2017, Carl Hanser Verlag, München

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Determination of global and local cleavage fracture characteristics of high strength bolt steels
  5. Electroplating Ni-doped Mn-Co films on AISI 430 stainless steel as interconnects in solid oxide fuel cells (SOFC)
  6. Influence of surface microstructure and chemical compositions on grooving corrosion of carbon steel welded joints
  7. Method for determining the strain rate sensitivity factor for the Johnson-Cook model in Charpy tests
  8. Optimizing the visibility of X-ray phase grating interferometry
  9. Friction and wear properties of nano-carbon reinforced Cu/Ti3SiC2/C nanocomposites
  10. Influence of austenization temperature on microstructure and mechanical properties of a new ultra-high strength low alloyed steel
  11. Microstructural and mechanical characterization of the parabolic spring steel 51CrV4
  12. Comparison of deep drawability of AA5754-H22 and AA6061-T6 aluminum alloys for automotive applications
  13. Transformation of ferrite/carbide into austenite during continuous heating of a 100Cr6 bearing steel
  14. Effect of TiO2 nanoparticles on the microstructure evolution and crystallographic texture in magnesium
  15. Mechanical behavior of single-lap and double-lap adhesive joined composite parts
  16. FE simulation of plastic collapse and geometrical factors affecting the bending response of a tubular aluminum beam
  17. Effect of spark plasma sintering temperature on structure and phase composition of Ti-Al-Nb-based alloys
  18. Behavior of a graphene/epoxy composite used as thermal interface material for LED heat dissipation
  19. Introducing gear ratings and AGMA conversion factors for the steel spur gear design under bending fatigue
  20. Partial replacement of carbon black by nanoclay in butyl rubber compounds for tubeless tires
  21. Wear behavior of an epoxy/HNT composite
  22. Characterization and properties of industrial polymer matrix composite sanitarywares
  23. Normal deformation measurement of free surfaces on rocks under biaxial compression
https://doi.org/10.3139/120.111098

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Determination of global and local cleavage fracture characteristics of high strength bolt steels
  5. Electroplating Ni-doped Mn-Co films on AISI 430 stainless steel as interconnects in solid oxide fuel cells (SOFC)
  6. Influence of surface microstructure and chemical compositions on grooving corrosion of carbon steel welded joints
  7. Method for determining the strain rate sensitivity factor for the Johnson-Cook model in Charpy tests
  8. Optimizing the visibility of X-ray phase grating interferometry
  9. Friction and wear properties of nano-carbon reinforced Cu/Ti3SiC2/C nanocomposites
  10. Influence of austenization temperature on microstructure and mechanical properties of a new ultra-high strength low alloyed steel
  11. Microstructural and mechanical characterization of the parabolic spring steel 51CrV4
  12. Comparison of deep drawability of AA5754-H22 and AA6061-T6 aluminum alloys for automotive applications
  13. Transformation of ferrite/carbide into austenite during continuous heating of a 100Cr6 bearing steel
  14. Effect of TiO2 nanoparticles on the microstructure evolution and crystallographic texture in magnesium
  15. Mechanical behavior of single-lap and double-lap adhesive joined composite parts
  16. FE simulation of plastic collapse and geometrical factors affecting the bending response of a tubular aluminum beam
  17. Effect of spark plasma sintering temperature on structure and phase composition of Ti-Al-Nb-based alloys
  18. Behavior of a graphene/epoxy composite used as thermal interface material for LED heat dissipation
  19. Introducing gear ratings and AGMA conversion factors for the steel spur gear design under bending fatigue
  20. Partial replacement of carbon black by nanoclay in butyl rubber compounds for tubeless tires
  21. Wear behavior of an epoxy/HNT composite
  22. Characterization and properties of industrial polymer matrix composite sanitarywares
  23. Normal deformation measurement of free surfaces on rocks under biaxial compression
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