Community Research and Development Information Service - CORDIS

Abstract

The Hopkinson bar technique is widely used to determine the mechanical properties of structural materials under high loading rates. A new system is proposed which consists of two bundles of 25 aluminium bars to which the concrete test specimen is glued. Concrete specimens of 20 cm size are tested and by instrumenting each individual bar in the bundle with strain gauge, measures are obtained of the incident, reflected and transmitted pulses concerning the portion of the concrete specimen cross-section facing each pair of bars in the bundle. By means of the Hopkinson's bar bundle it is possible to measure the true resisting cross-section of the test specimen and thereby determine the crack propagation path and speed. These parameters allow a reconstruction of the true stress-strain diagram of the material up to fracture of the test specimen.

Additional information

Authors: ALBERTINI C, JRC Ispra (IT);CADONI E, JRC Ispra (IT);LABIBES K, JRC Ispra (IT)
Bibliographic Reference: Paper presented : Eighth International Congress on Experimental Mechanics, Nashville (US), June 11-13, 1996
Availability: Available from (1) as Paper EN 39954 ORA
Record Number: 199610970 / Last updated on: 1996-09-30
Category: PUBLICATION
Original language: en
Available languages: en