Abstract
The dynamic test techniques used to obtain the mechanical properties of brittle materials are described. The techniques are based on the fundamental Kolsky method using the Split-Hopkinson Pressure Bar. Dynamic tests are characterized by high intensity and short duration and the influence of inertia on their results should be ruled out which is especially important for brittle media. The prerequisites and assumptions presented methods are described to justify the validity of the obtained data. The methods allow to obtain dynamic deformation diagrams at compression, splitting, indirect tension, shear and triaxial stress state and also to determine the ultimate strength, strain and time properties of brittle materials. The techniques are approved in the tests of ceramic bricks, finegrain concrete and fiber-reinforced concrete.
Highlights
In recent years, the study of the processes of dynamic deformation and destruction of structures is becoming relevant
Dynamic effects are very diverse and can have both operational and extreme character. Such effects are characterized by a continuous change in parameters, high intensity, short duration and sometimes limited action zone
The dynamic properties in a wide range of strain rates are mainly obtained by the Kolsky method using the Split-Hopkinson Pressure Bar (SHPB) and its numerous modifications
Summary
The study of the processes of dynamic deformation and destruction of structures is becoming relevant. The present paper is of a methodical character and devoted to the description of the Kolsky method and some of its modifications for testing brittle media, as well as the main assumptions underlying them. Features of these materials, including a variety of concretes, rocks, bricks and others are non-linear deformation, the limit difference in stress-strain strength and weak signals of small amplitude in the transmitted pulse, which characterize the response of material and which must be registered with strain gages pasted on a measured bar
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