PSI - Issue 37

I. Shardakov et al. / Procedia Structural Integrity 37 (2022) 1065–1072 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 3. Deformation diagrams for two samples before (solid line) and after (dashed line) ion-plasma treatment in the coordinates "effective stress – axial deformation": (a) fluence 10 15 ion / cm 2 , (b) fluence 10 16 ion / cm 2 . Fig. 4a shows the values of the elastic modulus of the untreated sample obtained in a sequence of 5 experiments with one sample. Statistical processing of these results shows that on such a set of data the spread of values is no more than 3%. Such accuracy in measuring the elastic modulus confirms the reliability of the dependence shown in Fig. 4b, which represents the relative change in the effective elastic modulus of the treated samples depending on the fluence level. In the figure, the dots indicate the values averaged over 5 experiments, the vertical lines show the standard deviations.

Figure 4. (a) Elastic modulus for 5 experiments with one sample; (b) Dependence of the relative increase in the elastic modulus, %, on the fluence of ion-plasma treatment.

Fig. 5a shows the elastic modulus of the carbonized layer, calculated according to relation (3), depending on the fluence of ion-plasma treatment. The dots on the graph represent the modulus values averaged over 3 samples processed at the same fluence level, the dashes show the standard deviations. The discovered patterns were confirmed in a series of experiments that we conducted earlier (Chudinov et al. (2020)). The absorption of light in the UV range by polyethylene samples with carbonized layer formed at different