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A relation between surface free energy (&#963;MHV) and Meyer’s lines cut-values has been established using Vickers microhardness (MHV) method and empirical physical laws. This relation allows the calculation of &#963;MHV only from MHV data. The parameters required are Meyer’s lines cut-values and the mean value of diagonal length of the impression at different loads applied (drealmean). Our study of 12 samples of ultra high molecular weight polyethylene (PE-UHMW) showed that the new approach is applicable when the slope value of Meyer’s lines equals 2 (i.e. n = 2). A &#947;-60Co source was used for the irradiation of 11 samples (one of the samples investigated is un-irradiated) at room temperature in air. Doses of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000 and 1500 kGy were applied. The values of &#963;MHV obtained are in a good agreement with the literature. The dependence of &#963;MHV on the dose applied strictly corresponds to the radiation effects theory. MHV was measured at seven different loads – 0.0123, 0.0245, 0.049, 0.098, 0.196, 0.392, 0.785 N at a loading time of 30 s

A new approach to the estimation of surface free energy based on Vickers microhardness data