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AssigneeEuropean Atomic Energy Community
InventorsCarlo Albertini, Mikhail Mogilevsky
Estimating the term…
Stress wave measuring apparatus includes a Hopkinson bar or pressure bar bundle system comprising an input bar bundle having input bars, and an output bar bundle having output bars 104a. A brittle test specimen is positioned in between the input and output bar bundles. Means is provided to induce a one dimensional compression force into the bar bundles. Instrumentation is introduced onto the input and output bars for measuring values of shear wave or crack propagation. The specimen may be placed under different stress conditions measured by appropriate instrumentation on the bar bundles. In one embodiment, a rod gauge is glued to a rock massive and arranged to measure wave effects generated in the rock massive. Other arrangements provide amplification of the wave effects prior to measurement by instrumentation on the gauge 500.
Apparatus (101) specially designed for measuring mechanical properties or characteristics of a brittle material or structure (102), said apparatus (101) comprising a Hopkinson bar or pressure bar system (103,104) comprising an input bar bundle (103) and an output bar bundle (104), each said bundle comprising a plurality of parallel bars (103a,104a) each equipped with instrumentation for measuring values of shear wave or shear crack propagation in said brittle material or structure under test located in between said input and output bar bundles (103,104).
A method of measuring mechanical properties of characteristics of a brittle material or structure (102), said method comprising the steps of:
Measuring apparatus arranged to measure wave effects generated in a geological structure (R), comprising a rod (600) adapted to be fixed to a surface (r1) of said geological structure to receive a longitudinal wave, and wherein said rod (500) is instrumented with sets of gauges (502,602,702) attached to the rod (700) in different directions to allow division of information into intensities of longitudinal and shear components of arrived perturbation, to enable measurement of shear wave or shear crack propagation in said structure.
A method of measuring values of shear wave or shear crack propagation in a structure (R) using measuring apparatus (800) comprising a rod (800) instrumented with sets of gauges attached to the rod in different directions arranged to measure wave effects generated in said structure (R).
Dependencies are inferred from the claim text.