Issue 35

A. Vshivkov et alii, Frattura ed Integrità Strutturale, 35 (2016) 57-63; DOI: 10.3221/IGF-ESIS.35.07 59 Figure 1 : Schematic of the device.1 – testing sample; 2 – “measuring” Peltier element; 3 – “cooling” Peltier element; 4 – radiator; 5, 6 – thermocouple; 7 – resistor. Figure 2 : Sensor calibration scheme (1 – back side of testing machine, 2 – spring, 3 – sensor, 4 - resistor 5 - plastic sample 6 - DC power supply source). The sensor is calibrated directly in the testing machine, in conditions closely approximating the experimental conditions. A calibration curve for each sensor was obtained based on the experimental data (Fig. 3). The sensor signal is correlated to the heat flux dissipated by the resistor. The graphs presented in Fig. 3 show a linear dependence that agrees well with the theoretical prediction. Figure 3 : Calibration graph of heat flow sensors.