Accessible Requires Authentication Published by De Gruyter May 26, 2013

Small Mass Impact Testing of Sandwich Structures

Stefan Dietrich, Jan Kuppinger, Peter Elsner and Kay Weidenmann
From the journal Materials Testing

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.


Dipl.-Phys. Stefan Dietrich was born in 1983. He studied physics at Karlsruhe University from 2003 to 2008. During a one year stay at Heriot-Watt University (Edinburgh) in 2006 he graduated with a master's degree in optoelectronics and lasers. Since 2009 he works as scientific assistant at the Institute of Materials Science and Engineering I (IWK I) at Karlsruhe University in the workgroup “Hybrid Materials and lightweight structures”. The topic of his current work is on damage behaviour and damage characterization of sandwich composites.

Dipl.-Ing. Jan Kuppinger was born in 1981. He studied Mechanical Engineering at Stuttgart University from 2001 to 2006. Afterwards, he started working as scientific assistant at the Fraunhofer Institute for Chemical Technology (ICT) in Pfinztal. He works in the field of process- and manufacturing development for fibre reinforced polyurethanes and polyurethane sandwich structures.

Prof. Dr.-Ing. Peter Elsner, born 1956, got his Diploma in Material Science at the University of Erlangen and his doctor's degree in Mechanical Engineering from the University of Stuttgart. Since 2006 he is director of the Fraunhofer-Institute for Chemical Technology (ICT) in Pfinztal and holds the Chair for Polymer Technology at the Institute of Materials Science I at KIT Karlsruhe.

Dr.-Ing. Kay Weidenmann was born in 1978. He studied Materials Science at Stuttgart University from 1998 to 2003. Afterwards, he worked as scientific assistant at the Institute of Materials Science and Engineering I (IWK I) at the Karlsruhe Institute of Technology and got his doctor's degree in 2006 for his work on compound-extruded aluminium-based extrusions. Since 2007 he is lecturer at IWK I heading the workgroup “Hybrid Materials and lightweight structures” which was established under his guidance.


Refrences

1 J.Kuppinger, G.Kopp: Innovative sandwich structures for functionally integrated lightweight design, ATZ worldwide eMagazines (2009), No. 04, pp. 4449 Search in Google Scholar

2 U. K.Vaidya, A.Abraham, S.Bhide: Affordable processing of thick section and integral multi-functional composites, Composites Part A: Applied Science and Manufacturing (2001) 32, No. 8, pp. 11331142 Search in Google Scholar

3 T. A.Dawood, R. A.Shenoi, M.Sahin: A procedure to embed fibre bragg grating strain sensors into GFRP sandwich structures, Composites Part A: Applied Science and Manufacturing (2007) 38, No. 1, pp. 217226 Search in Google Scholar

4 J.Kim, S.Lee, K.Shin: Manufacturing and structural safety evaluation of a composite train carbody, Composite Structures (2007) 78, No. 4, pp. 468476 Search in Google Scholar

5 B. J.Ryu, K. B.Shin, Y.Lee, S. J.Lee: A study on flexural behaviors of sandwich composites with facesheets of unequal thickness, Korea Soc. Rail (2007), No. 10, pp. 201210 Search in Google Scholar

6 I. M.Daniel, P. M.Schubel, Jyi-JiinLuo: Impact and post impact behavior of composite sandwich panels, Composites Part A: Applied Science and Manufacturing (2007) 38, pp. 10511057 Search in Google Scholar

7 I. M.Daniel, P. M.Schubel, J.Luo: Low velocity impact behavior of composite sandwich panels, Composites Part A: Applied Science and Manufacturing (2005) 36, pp. 13891396 Search in Google Scholar

8 U. K.Vaidya, M. V.Hosur, D.Earl, S.Jeelani: Impact response of integrated hollow core sandwich composite panels, Composites Part A: Applied Science and Manufacturing (2000) 31, No. 8, pp. 761772 Search in Google Scholar

9 T.Anderson, E.Madenci: Experimental investigation of low-velocity impact characteristics of sandwich composites, Composite Structures50 (2000), No. 3, pp. 239247 Search in Google Scholar

10 L.Torre, J. M.Kenny: Impact testing and simulation of composite sandwich structures for civil transportation, Composite Structures50 (2000), No. 3, pp. 257267 Search in Google Scholar

11 P.Woolford: Guidance on the engineering acceptance of on-track machines, Railway Group Guidance Note (2004), 2(GM/GN2575), pp. 1290 Search in Google Scholar

12 M.Palik, F.Strümpel, W.Söchtig: From reaction processes to injection moulding – materials and process engineering that's right for your application, Proc. of the 9th International Conference on Fibre Reinforced Materials (2006), pp. B71B79 Search in Google Scholar

13 M.Taverna, A.Zarantonello: Industrial developments in co-injection/long fibre technology, Cannon at UTECH 2000 – Industrial developments in co-injection/long fibre technology (2000), pp. 16 Search in Google Scholar

14 DIN 53293: Prüfung von Kernverbunden – Biegeversuch. Search in Google Scholar

15 DIN 53294: Prüfung von Kernverbunden – Schubversuch. Search in Google Scholar

16 DIN 527-1: Kunststoffe – Bestimmung der Zugeigenschaften. Search in Google Scholar

17 R.Olsson: Engineering method for prediction of impact response and damage in sandwich panels, Journal of Sandwich Structures and Materials4 (2002), No. 1, pp. 329 Search in Google Scholar

18 S.Abrate: Modeling of impacts on composite structures, Composite Structures51 (2001), pp. 129138 Search in Google Scholar

19 S.Abrate: Impact on Composite Structures, Cambridge University Press (1998) Search in Google Scholar

20 W. J.Stronge: Impact Mechanics, Cambridge University Press (2004) Search in Google Scholar

21 K. L.Johnson: Contact Mechanics, Cambridge University Press (1987) Search in Google Scholar

22 D.Zenkert: Introduction to Sandwich Construction, EMAS Publishing (1995) Search in Google Scholar

23 D.Zenkert: Handbook of Sandwich Construction, EMAS Publishing (1997) Search in Google Scholar

Published Online: 2013-05-26
Published in Print: 2010-11-01

© 2010, Carl Hanser Verlag, München