Single-axis two-way loading and split Hopkinson pressure bar and pull bar device and experimental method

Abstract

The invention relates to an experimental method of dynamic mechanics performance testing of materials, in particular to a single-axis two-way loading and split Hopkinson pressure bar and pull bar device and an experimental method. The device comprises a loading device and two incident bars, the loading device comprises a power source, a capacitor charger and loading guns, a power supply part of existing electromagnetic riveting equipment is adopted for the capacitor charger, and the loading guns with the same parameters are connected into the capacitor charger after being in parallel connection. By means of the single-axis two-way loading and split Hopkinson pressure bar and pull bar device and the experimental method, incident waves at the two sides simultaneously and symmetrically load aspecimen dynamically, symmetric loading of the specimen is achieved to shorten the balancing time of stress inside the specimen, the strain rate of the specimen is increased, and thus the defects ofexisting equipment of being low in strain rate and inaccurate in testing of elastic sections are overcome.

Description

technical field [0001] The invention relates to an experimental method for testing the dynamic mechanical properties of materials, in particular to a uniaxial bidirectional loading separated Hopkinson pressure bar and pull bar device and an experimental method. Background technique [0002] Currently, the split Hopkinson rod technique is most widely used in the field of materials science to measure the tensile mechanical properties of materials at high strain rates. The basic principle of this method is: place a short sample between two pull rods, and carry out tensile loading on the sample through the accelerated mass block, the short rod impact or the acceleration pulse generated by the explosion. Simultaneously, the pulse signal is recorded by means of the strain gauge glued on the tie rod at a certain distance from the end of the rod. If the tie rod remains elastic, the stress pulse in the rod will propagate at elastic wave speed without distortion. In this way, the st...

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Problems solved by technology

In addition, since the incident rod and the amplifier are connected by threads, no matter whether the compression test or the tensile test is done, the compression wave and the tensile wave can be transmitted into the incident rod at the same time, so the stress waves generated by these two schemes are not purely tensile. wave or compression wave, it is only suitable for some experiments that do not have special requirements on the incident waveform

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