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The results of dynamic tests on building brick samples were analyzed using the
incubation time fracture criterion. The strength and time properties of sand-lime brick and
ceramic brick were under study. The tests were carried out using the classical Kolsky method
and its modification - dynamic splitting. Strain rates under compression reached
2.5ž103 MPa/s while stress rates under tension reached 3.5ž102 GPa/s. It is noted that the
strain rate affects the strength and time properties of the materials under study. The
parameters of the incubation time fracture criterion were determined on the basis of the
experimental deformation diagrams of material in axes stress versus time. Herewith, nonlinear
nature of the loading branch of dynamic diagrams was taken into account. Both tested
materials qualitatively showed the same change of the mechanical properties.
Keywords: dynamics, brick, split Hopkinson pressure bar, splitting, strain rate, stress rate, incubation time criterion |
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