PSI - Issue 6

V.A. Morozov et al. / Procedia Structural Integrity 6 (2017) 154–160 Morozov et al. / Structural Integrity Procedia 00 (2017) 000–000

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Oscillograms of the current flowing along the conductor as well as the voltages on the exploded conductor were taken during the experimentation. This oscillograms for a low-voltage loading scheme are shown in Fig. 3.

Fig. 3. Characteristic oscillograms of current (1) and voltage (2).

The radial pressure profiles were also measured using a specially developed broadband piezoelectric sensor. Fig. 4 illustrates the oscillograms of the radial pressure pulse and the current flowing through the exploding con ductor for a low-voltage loading scheme of a fluoroplast sample. And Fig. 5 illustrates the corresponding oscillograms when a sample from PMMA was loaded.

Fig. 4. The oscillograms of the radial pressure pulse (1) and the current flowing through the exploding conductor (2) for a low-voltage loading scheme of a fluoroplast sample.

Characteristic oscillograms of the radial pressure and current of the conductor for the high-voltage loading scheme of a fluoroplast and PMMA sample are shown on Fig. 6 and Fig. 7. The investigations of fracture surface of PMMA and fluoroplast were carried out using optical microscope AXIO Observer Z1M in dark field.

3. Results and discussion

We can draw the following conclusions analyzing the presented oscillograms:

• Fig. 3 gives information on the development of the explosion process of the conductor. Resistance of the con ductor sharply increases at the moment of it’s exploding, and a peak appears on the oscillograms of the voltage the current as the maximum value of theirs change rate.