A new approach for Hugoniot equation of state of polycarbonate

The plate impact experiment is an important way to measure the equation of state of solid material in high pressure. However, traditional methods always have some defects, such as high failure rate, indefinite and inaccurate result in the test, and lack of comparison. Meanwhile, few of published data concerned the high strain rate behavior of polycarbonate during shock loading. In the present study, a new approach was therefore carried out to obtain the equation of state of polycarbonate material in a single-stage gas gun, which consists of asymmetric impact technology, manganin gauges, PVDF, electromagnetic particle velocity gauges and electrical pins. The least square method was used to analyze the fitting goodness and scatter degree of the single and the combined method respectively. The results showed that manganin gauges have the best property of stability, followed by particle velocity gauges, PVDF gauges and electrical pins. Compared with other single method, the combined method can improve the accuracy of measurement in a relatively less number of experiments than previous data. At last, the D - u Hugoniot curve of polycarbonate in high pressure was gained, and the manganin gauges were calibrated by the experimental data. (C) 2015 Elsevier Ltd. All rights reserved.