Relaxation processes close to the surface of the impacts tress application caused by the pulse electron beam

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Abstract

The paper presents outcomes of the study of short-timed shock action of the pulse electron beam on the aluminum obstacle. Analysis of the generation of the stress wave near the loaded surface based on the experimental data is provided. It is proved that wave generation in this case in contrast to theaction of laser beam takes place inside material in the area governed by the depth of electrons invasion.Relaxationofthestress wave starts from the boarder of this area. It was established that strongly non-equilibrium processes are take place in this relaxation area causing dramatic change depending on the shock parameters of the velocity of the stress and strength waves compared theirs stationary values. It is underlined that relaxation process has solo-wave nature in spite of the high stress amplitude. Separation of the elastic and plastic stresses propagation takes place only after the end of relaxation process.

About the authors

V. A. Morozov

St. Petersburg University

Author for correspondence.
Email: v.morozov@spbu.ru
Russian Federation, St. Petersburg

V. S. Ivanov

St. Petersburg University

Email: st048035@student.spbu.ru
Russian Federation, St. Petersburg

V. M. Kats

St. Petersburg University

Email: v.kats@spbu.ru
Russian Federation, St. Petersburg

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Formation of voltage pulses. 1 – initial voltages, 2 – half-wave going deep into the material, 3 – half-wave going to the free surface, 4 – reflected wave, 5 – superposition of waves

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3. Fig. 2. Formed voltage pulses. 1 – compression pulse, 2 – tension pulse

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4. Fig. 3. 1 – vacuum chamber, 2 – high-voltage input, 3 – cathode, 4 – sample, 5 – current meter (Rogowski coil), 6 – piezoelectric sensor

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5. Fig. 4. Characteristic oscillogram of the beam current pulse I (relative units) and the compression voltage pulse σ (relative units) (time t in ns)

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6. Fig. 5. Change in the propagation speed of the voltage pulse v(t) (m/s), change in the coordinate x(t) (mm), dependence x(t) = ct (time t in ns)

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7. Fig. 6. Change in the amplitude of the compressive stress pulse (MPa) from the coordinate (mm)

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