ALTERNATIVE METHOD OF STRESS PARAMETERS DETERMINATION DURING TENSILE TESTS USING METRIC ENTROPY AND DIC

The paper proposes a combined method for the mechanical properties assessment of composite materials based on the analysis of the internal dynamics of raw data from uniaxial tensile tests. Determination of the Kolmogorov-Sinai (K-S) metric entropy from the recorded data enables to find the tensile strength of materials. A correctness of the methodology proposed was verified by the full-filed DIC measurements. The main aim of this research is to present the combination of two different research methods: classical, analytical determination of K-S entropy on the basis of measurement data captured from uniaxial tensile tests and optical full-field displacement measurements collected by means of digital image correlation technique.