The experimental results of relationship between tensile strength and piezoelectric voltage in transparent monolithic polycarbonate are presented in that paper. The most useful location of electrodes on the surface of monolithic polycarbonate samples for measurement the piezoelectric voltage was determined. It was showing that the first derivative of piezoelectric voltage by time passes through the zero when the cracks in polycarbonate start arising. Moreover, the local maximums of the piezoelectric voltage and a tensile strength come a little bit earlier than the cracks in polycarbonate start arising. That allows using piezoelectric effect to diagnostics the maximum allowable strength in transparent monolithic polycarbonate.
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