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Figures 12 shows the fracture types as proposed by Tomas and et al [2].<br />

Conclusion<br />

The DEM simulation shows the similar cone type disturbed region as shown by FEM<br />

for the crack initiation. Depending upon the impact velocities the cracks are<br />

furthering inside along with meridian cracks and secondary cracks. The diameter of<br />

the contact region depends upon the impact velocities.<br />

Acknowlegdements<br />

The authors would like to thank German Research Foundation for the financial<br />

support.<br />

References<br />

[1] K. Seick, Entwicklung des Abfallaufkommens und er Abfallzusammensetzung<br />

im Land Sachsen-Anhalt, Seminar Siedlungsabfallwirtshaft, Universität<br />

Magdeburg, 1996.<br />

[2] J. Tomas, M. Schreier, T. Gröger, S. Ehlers, Impact crushing of concrete for<br />

liberation and recycling, Powder Technology 105(1999), 39-51<br />

[3] L. Kiss, Vergleich der Prall- und Druckzerkleinerung eines zweikomponentigen,<br />

mineralischen Modellstoffes, Dissertation, Universität Karlsruhe, 1979<br />

[4] L. Kiss, K. Schnört, Aufschlußzerkleinerung eines zweikomponentigen<br />

modellstoffes unter einzelkornbeanspruchung durch druck-und<br />

prallbeanspruchung [Liberation of two component materail bz single particle<br />

compression and impact crushing]. Aufbereit.-Tech.30(5)(1980)223-230<br />

[5] N. Arbiter, C. C. Harris, G. A. Stamboltzis, Single fracture of brittle spheres,<br />

Soc. Min. Eng. AIME, Trans. 244 (1969) 118-133.<br />

[6] B. Dora, H. Budelmann, Baustoffeigenschaften, Zwischenbericht des<br />

Sonderforschungsbereiches 385, Baustoffrecycling, Magdeburg, 1996, 251-281.<br />

[7] J. Tomas, M. Schreier, S. Ehlers, Aufschlusszerkleinerung von Beton,<br />

Proceedings of 7th Intern. Building Material Recycling Forum, Interlaken, 1996,<br />

16-36.<br />

[8] H. Schubert, Zur Energieausnutzung bei Zerkleinerungsprozessen, Aufbereit. –<br />

Tech. 34 (10) (1993) 495-505.<br />

[9] K. D. Kafui, C. Thornton, Numerical simulations of impact breakage of a<br />

spherical crystalline agglomerate, Powder Technology 109 (2000) 113-132<br />

[10] C. Thornton, M. T. Ciomocos, M. J. Adams, Numerical simulations of<br />

l i b k P d T h l 105 (1999) 74 82

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