Engineering Transactions, 59, 3, pp. 197–210, 2011

Strain Rate Behaviour of Three Rocks in Tension

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

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

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

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

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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