Implementation method for equivalently loading incident wave in double-shaft split Hopkinson pressure bar and pull rod experiments

Abstract

The invention discloses an implementation method for equivalently loading an incident wave in double-shaft split Hopkinson pressure bar and pull rod experiments, and solves the technical problem that the existing method is hard to equivalently load the incident wave in the double-shaft split Hopkinson pressure bar and pull rod experiments. The technical scheme is that two same double-coil electromagnetic incident wave generators are adopted, wherein discharge coils of each of the generators are coaxially and reversely mounted to respectively control loading of the Hopkinson pressure bar and pull rod experiments, so that equivalent loading equipment is uniformed. When the Hopkinson pressure bar and pull rod experiments are carried out, vertical and transverse discharge coils are connected in series to a same group of discharging capacitors controlled by a same group of discharge silicon controlled and synchronously trigger vertical and transverse incident waves. By virtue of thickness complementation of a secondary coil, the vertical and transverse discharge coils are connected in series to the same group of discharging capacitors controlled by the same group of discharge silicon controlled, so that the incident wave is equivalently loaded in the double-shaft split Hopkinson pressure bar and pull rod experiments, and the loading interval error is less than 0.1 microsecond.

Description

technical field [0001] The invention relates to a Hopkinson compression rod and pull rod experiment method, in particular to a method for realizing equivalent loading of incident waves in a biaxial Hopkinson compression rod and pull rod experiment. Background technique [0002] In a high strain rate environment, the Hopkinson compression bar and tension bar experiments are widely used in testing the mechanical properties of materials. The Hopkinson compression bar test is used to measure the compressive properties of materials, and the Hopkinson tension bar test is used to measure the tensile properties of materials. . [0003] In practice, due to the different loading methods of the Hopkinson compression bar and the tension bar experiment, the loading equipment for the compression bar and the tension bar experiment are separated from each other, and the two types of experiments cannot be completed with one set of equipment. [0004] The document "Application Publication No...

AI Technical Summary

Problems solved by technology

But in reality, due to the reaction time difference of the PLC control system of this kind of experimental equipment, and the capacitance error of 5%-20% in the discharge capacitor bank, there will be a discharge delay of 20ms-30ms when the discharge SCR is triggered.

In addition, there will inevitably be certain errors in the processing of the experimental device, which will lead to the results of the two sets of experimental equipment, such as unequal loading incident wave amplitude, different pulse width, and asynchronous loading, and ultimately it is difficult to realize the biaxial Hopkinson pressure bar and pull bar experiments. Equivalent Loading Device Unity and Incident Wave Equivalence

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