Incident wave control method for electromagnetic-force Hopkinson pressure bar and torsion bar experiment loading device

Abstract

The invention discloses an incident wave control method for an electromagnetic-force Hopkinson pressure bar and torsion bar experiment loading device. The incident wave control method is used for solving the technical problem of the existing electromagnetic force based Hopkinson pressure bar and torsion bar experiment methods that the practicability is poor. The technical scheme is as follows: precise control is carried out on the amplitude and pulse width of loaded incident waves by using relationships between the electromagnetic-force incident waves and discharge voltage, discharge inductance, discharge capacity, discharge resistance and secondary coil thickness, so that the maximum pulse amplitude and rising edge slope of the incident waves are increased. According to the method disclosed by the invention, the underdamped working condition of an electromagnetic force stress wave generator is guaranteed through reducing the discharge resistance, so that the maximum amplitude and rising edge slope of the incident waves are increased; by adopting a cake-shaped discharge coil and a 10mm-thickness secondary coil, the maximum pulse amplitude of the incident waves is further increased and can reach 325MPa, and the precise control on the amplitude of the incident waves in the range of 10-325MPa and the pulse width of the incident waves in the range of 100-500 microseconds is realized.

Description

technical field [0001] The invention relates to an incident wave control method of a loading device, in particular to an incident wave control method of an electromagnetic force Hopkinson compression rod and pull rod experimental loading device. Background technique [0002] The mechanical properties of materials can be of great importance to engineering designers, and it is a key factor in determining the reliability of structural design and numerical simulation. The Hopkinson pressure bar and tie bar technology (SHPB) is widely used in the testing of mechanical properties of materials at high strain rates. The impact of short rods generates acceleration pulses to load the sample. At the same time, the pulse signals are recorded through the strain gauges pasted on the incident rod and the transmission rod, and the mechanical properties of the material are calculated by using the pulse signals. The technology was first proposed by Hopkinson in 1914. In 1948, Kolsky proposed...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the poor practicability of the existing Hopkinson compression bar and tie rod experimental method based on electromagnet

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