Measuring method for dynamic mechanics property of eka-three-dimensional material

Abstract

The invention discloses a method for measuring the dynamic mechanical properties of a quasi three-dimensional material. The method is characterized in that: firstly, a first positioning round table is integrally and coaxially arranged at the front end of an incident bar; a second positioning round table is integrally and coaxially arranged at the front end of a transmission bar; a third positioning round table is integrally and coaxially arranged at the rear part of the second positioning round table; a first pressure cavity is arranged in a first shell body; a first through-hole is arranged on the first shell body and communicates with the first pressure cavity; the front end of the transmission bar coaxially slides and extends into a second shell body; an annular second pressure cavity is arranged between the rear end surface of the third positioning round table and the second shell body; and a second through-hole is arranged on the second shell body and communicates with the secondpressure cavity. The method has the advantages that after the strain measured through the above steps is calculated and processed through a corrected formula of a three-wave method, the interference introduced by the second pressure cavity can be eliminated, thus obtaining a relatively accurate dynamic stress strain curve of an object to be measured.

Description

technical field The invention relates to a mechanical property of a material, in particular to a method for measuring the dynamic mechanical property of a quasi-three-dimensional material. Background technique Rock, concrete and other engineering materials, their mechanical behavior is obviously affected by their stress state. The description and modeling of the mechanical behavior of this class of engineering materials has not been well resolved so far, and the situation is even more serious under dynamic loading conditions. From the perspective of engineering application, when engineering materials such as rock and concrete are subjected to dynamic loads such as low and high-speed impacts, explosion impacts, etc., the locality of loading and the internal constraints of materials in all directions are normal. The mechanical behavior under constraints or three-dimensional stress state is especially important. The Hopkinson compression bar is a commonly used experimental m...

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Problems solved by technology

The Hopkinson compression bar is a commonly used experimental method to study the dynamic mechanical properties of materials, but it can only be used as a material experiment under one-dimensional stress state. In order to realize the experiment under three-dimensional stress state, it is usually used to add side The so-called passive confining pressure technology with vertical constraints, but a better method is to use hydraulic devices to exert controllable confining pressure on the specimen, so as to obtain more detailed mechanical properties of rock, concrete and other engineering materials under the quasi-three-dimensional stress state; Generally, the confining pressure device is realized by adding a hydraulic chamber to the Hopkinson pressure rod, but in order to avoid the extrusion of the pressure rod due to the axial pressure, it is necessary to use a test piece with a diameter similar to or equal to the pressure rod, which can The measured experimental strain rates are greatly limited by

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