Assessment of Fracture Behaviour under Impact Loading with Simultaneous Recording of Acoustic Emission

Marcus Schoßig; Christian Bierögel; Wolfgang Grellmann

doi:10.3139/120.110410

Article

Assessment of Fracture Behaviour under Impact Loading with Simultaneous Recording of Acoustic Emission

Marcus Schoßig , Christian Bierögel and Wolfgang Grellmann

Published/Copyright: May 26, 2013

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From the journal Materials Testing Volume 55 Issue 2

Abstract

The objective of this paper is the assessment of the toughness of glass fiber-reinforced polypropylene and polybutene-1 by means of fracture mechanics concepts to describe the resistance against unstable crack initiation for these materials. In addition, the acoustic emissions during the instrumented Charpy impact test were recorded, which allows the characterization of the damage kinetics. For this purpose, the recorded transient signals of the acoustic sensor were analyzed with the wavelet transform. Thus, it was possible to describe the onset of the damage in the time domain, as well as the load F_s and the corresponding deflection f_s. In dependence on the bonding conditions of the materials, the damage onset was detected for polypropylene before and for polybutene-1 at the transition from elastic to elastic-plastic behaviour.

Kurzfassung

Ziel des vorliegenden Beitrages ist die Bewertung der Zähigkeit von glasfaserverstärkten Polypropylen und Polybuten-1-Werkstoffen mit Hilfe bruchmechanischer Konzepte zur Beschreibung des Widerstands gegenüber instabiler Rissinitiierung. Zusätzlich wurden die schädigungssensitiven Schallemissionen im instrumentierten Kerbschlagbiegeversuch aufgezeichnet, um eine Bewertung der Schädigungskinetik unter schlagartiger Beanspruchung durchzuführen. Hierzu wurden die aufgezeichneten Hochfrequenzsignale des akustischen Sensors mit Hilfe der Wavelet-Transformation in den Frequenzraum überführt. Damit konnte der Schädigungsbeginn durch die Messgrößen Kraft F_s und Durchbiegung f_s bestimmt werden. In Abhängigkeit von den Haftungsbedingungen der Werkstoffe wurde der Schädigungsbeginn für Polypropylen vor und für Polybuten-1 beim Übergang vom elastischen zum elastisch-plastischen Werkstoffverhalten beobachtet.

Dr.-Ing. Marcus Schoßig was born in Halle (Saale) in 1978. He studied material science from 1998 until 2003 at the Martin-Luther University Halle-Wittenberg, Germany and received his PhD in 2010. At the moment he works at the Hochschule Merseburg, Germany – University of Applied Sciences on the field of fiber-reinforced plastics, nondestructive testing as well as aging of polymers by artificial weathering.

Dr.-Ing. Christian Bierögel was born in 1953 in Dresden. From 1974 until 1978 he studied material science at the TH Leuna-Merseburg, Germany and received his diploma here in 1978. He finished his PhD in 1984. Since 1992 he is senior associate scientist in the field of material testing and the leader of the accredited test laboratory “Mechanische Prüfung von Kunststoffen”. He works on the field of nondestructive testing, hybrid methods of polymer diagnostics as well as polymer testing for medicine and pharmacy.

Prof. Dr. Wolfgang Grellmann was born in 1949 in Ammendorf, Germany and studied physics at the Martin-Luther University Halle-Wittenberg, Germany from 1968–1974. He received his diploma in physics 1974 and the PhD in 1978 with the work “Determination of micro hardness on glasses and ceramics” at the same university. In 1986, he received his habilitation in material science with the work “Evaluation of crack resistance behaviour of polymers with fracture mechanical values” and since 1995 he is head of the professorship “Materials testing/materials diagnostics” at the Department/Centre of Engineering Sciences at the Martin-Luther University Halle-Wittenberg, Germany. Prof. Grellmann is manager of the “Polymer Service GmbH Merseburg”, scientific-technical director of the “Kunststoff-Kompetenzzentrum Halle-Merseburg” and chairman of the foundation “Akademie Mitteldeutsche Kunststoffinnovationen” as well as an expert of the “Industrie- und Handelskammer Halle-Dessau”.

References

1 W.Grellmann, S.Seidler (Eds.): Polymer Testing, Carl Hanser Verlag, Munich (2007)10.3139/9783446433595Search in Google Scholar

2 W.Grellmann, S.Seidler: Fracture toughness measurements in engineering plastics, W. Grellmann, S. Seidler (Eds.): Polymer Testing, Carl Hanser Verlag, Munich (2007), pp. 231–283Search in Google Scholar

3 K.Friedrich: Fracture Mechanical Behaviour of Short Fiber-Reinforced Thermoplastics, VDI Fortschrittsberichte R. 18, Nr. 18, Düsseldorf (1984)Search in Google Scholar

4 B.Lauke, B.Schultrich, W.Pompe: Theoretical Considerations of Toughness of Short-fibre Reinforced Thermoplastics. Akademie der Wissenschaften der DDR – Zentralinstitut für Festkörperphysik und Werkstoffforschung, Dresden, DDR (1988)Search in Google Scholar

5 K.Friedrich (Ed.): Application of Fracture Mechanics to Composite Materials, Volume 6, Composite Materials Series, Elsevier, Amsterdam (1989)Search in Google Scholar

6 S.Seidler, W.Grellmann: Zähigkeit von teilchengefüllten und kurzfaserverstärkten Polymerwerkstoffen, VDI Fortschrittsberichte R. 18, Nr. 92, Düsseldorf (1991)Search in Google Scholar

7 S.Seidler: Anwendung des Risswiderstandskonzeptes zur Ermittlung strukturbezogener bruchmechanischer Werkstoffkenngrößen bei dynamischer Beanspruchung, VDI Fortschrittsberichte R. 18, Nr. 231, Düsseldorf (1997)Search in Google Scholar

8 M.Schoßig: Bewertung der Schädigungsmechanismen von kurzglasfaserverstärkten Polyolefinen durch simultane Aufzeichnung der Schallemissionen unter quasistatischer und dynamischer Beanspruchung, Vieweg+Teubner, Springer Fachmedien Wiesbaden GmbH (2011)10.1007/978-3-8348-9924-8_3Search in Google Scholar

9 C.Bierögel: Hybrid methods of polymer diagnostics, W. Grellmann, S. Seidler (Eds.), Polymer Testing, Carl Hanser Verlag, Munich (2007), pp. 495–50910.3139/9783446433595.009Search in Google Scholar

10 F.Schemm, F.v.d.Vliet, J.Grasmeder: Polybutene (PB-1) – Fascinating Polyolefin, 7. Würzburger Kunststoffrohrtage, Proceedings, Dezember 12–13, 2001, pp. 1–18Search in Google Scholar

11 F.Schemm, J.Grasmeder, K.Könnecke, F.v.d.VlietPolybutene-1 Piping Systems: Material-specific Properties and Typical Applications, Wiesbadener Kunststoffrohrtage, Proceedings, April 25–26, 2002, pp. 1–11Search in Google Scholar

12 M.Schoßig, A.Zankel, C.Bierögel, P.Pölt, W.Grellmann: ESEM investigations for assessment of damage kinetics of short glass fibre-reinforced thermoplastics – Results of in situ tensile tests coupled with acoustic emission analysis, Composites Science and Technology71 (2011), pp. 257–265Search in Google Scholar

13 M.Schoßig, A.Zankel, C.Bierögel, P.Pölt, W.Grellmann: ESEM investigations for assessment of damage kinetics of short glass fibre-reinforced thermoplastics – Correlations between frequency ranges and damage mechanisms with the help of wavelet transform, Composites Science and Technology (2012), in preparation10.1016/j.compscitech.2010.12.004Search in Google Scholar

14 D.Kalkhof: Schallemissionsanalyse zur Bestimmung der Rißinitiierung beim instrumentierten Kerbschlagbiegeversuch, Materialprüfung28 (1986), pp. 267–27110.1515/mt-1986-280910Search in Google Scholar

15 J.P.Tronskar, M. A.Mannan, M.O.Lai: Application of acoustic emission for measuring crack initiation toughness in instrumented Charpy impact testing, Journal of Testing and Evaluation31 (2003), pp. 222–233Search in Google Scholar

16 H.Richter: Ermittlung zähbruchmechanischer Kennwerte unter schlagartiger Belastung mittels Schallemission, Dissertation, Forschungszentrum Rossendorf, Dresden (2000)Search in Google Scholar

17 M.Schoßig, W.Grellmann, T.Mecklenburg: Characterization of the fracture behaviour of glass-fiber reinforced thermoplastics based on PP, PE-HD and PB-1, Journal of Applied Polymer Science115 (2010), pp. 2093–2102Search in Google Scholar

18 W.Grellmann, S.Seidler, W.Hesse: Procedure for determining the crack resistance behaviour using the instrumented Charpy impact test, W. Grellmann, S. Seidler (Eds.): Deformation and Fracture Behaviour of Polymers, Springer, Berlin (2001), pp. 71–86Search in Google Scholar

19 M.Schoßig, C.Bierögel, W.Grellmann: Prüfung von Kunststoffen – Schallemissionsanalyse – Prozedur zur Validierung von AE-Sensoren, PSM-AE: 2010-01, http://www.polymerservice-merseburg.de/fileadmin/sachverstaendigenbuero/pdfs/prozeduren/prozedur_ae-sensor.pdfSearch in Google Scholar

20 P.Goupillaud, A.Grossmann, J.Morlet: Cycle-octave and related transforms in seismic analysis, Geoexploration23 (1984), pp. 85–102Search in Google Scholar

21 B.B.Hubbard: Wavelets – Die Mathematik der kleinen Wellen, Birkhäuser Verlag, Basel (1997)Search in Google Scholar

22 C.Blatter: Wavelets – Eine Einführung, Friedrich Vieweg & Sohn Verlag, Braunschweig (2003)10.1007/978-3-663-11817-6Search in Google Scholar

23 H.Suzuki, T.Kinjo, Y.Hayashi, M.Takemoto, K.Ono: Wavelet transform of acoustic emission signals, Journal of Acoustic Emission14 (1996), pp. 69–84Search in Google Scholar

24 C.U.Grosse, H.-J.Ruck, G.Bahr: Analyse von Schallemissionssignalen unter Verwendung der Wavelet-Transformation, 13. Kolloquium Acoustic Emission (AE) Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. (DGZfP) Proceedings, Jena, September 27–28, 2001, pp. 41–50.Search in Google Scholar

Published Online: 2013-05-26

Published in Print: 2013-02-01

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https://doi.org/10.3139/120.110410