Engineering Transactions, 59, 3, pp. 197–210, 2011
10.24423/engtrans.145.2011

Strain Rate Behaviour of Three Rocks in Tension

E. CADONI
University of Applied Sciences of Southern Switzerland, DynaMat Laboratory, Ticino
Switzerland

S. ANTONIETTI
University of Applied Sciences of Southern Switzerland, DynaMat Laboratory, Ticino
Switzerland

M. DOTTA
University of Applied Sciences of Southern Switzerland, DynaMat Laboratory, Ticino
Switzerland

D. FORNI
University of Applied Sciences of Southern Switzerland, DynaMat Laboratory, Ticino
Switzerland

The paper presents the dynamic characterization in tension of three rocks under medium and high strain-rates. The tests have been carried out by means of the JRC-Split Hopkinson Tension Bar and an Hydro-Pneumatic Machine, installed in the DynaMat Laboratory of the University of Applied Sciences of Southern Switzerland. The dynamic direct tension tests have been performed at 3 different strain rates (0.1, 10, 100 strain/second) on an orthogneiss, for loading directions 0◦, 45◦ and 90◦ respect to the schistosity, and two different types of marble. Results of the tests show a significantly strain-rate sensitive behaviour, exhibiting dynamic tensile strength increasing with strain-rate. In order to describe the strain rate behaviour of these rocks, the dynamic increase factors in function of the strain rates for tensile strength have been used.
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Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN).

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DOI: 10.24423/engtrans.145.2011