PSI - Issue 72

E.B. Galkina et al. / Procedia Structural Integrity 72 (2025) 222–228

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Fig. 6. Residual strain change in ABS along the length of the sample over time.

The obtained results demonstrate a similar qualitative pattern of compressive residual strain accumulation for all the studied materials. Notably, residual strain accumulation continues for approximately 10 hours after printing is completed. It is important to note that the end of the printing process is used as the reference time. The distribution of residual strains along the sample length, measured 12 hours after printing, reveals the presence of a strain gradient. Fig. 7 presents graphs of the time-dependent variation of strains for the central section along the sample length at three different height levels.

a)

b)

c) Fig. 7. Graph of residual strain variations over time for the central section of the sample along its length at three different height levels: (a) PLA; (b) PETG; (c) ABS. It should be noted that for PLA and PETG, there is no significant variation in residual strains along the sample height. In contrast, for ABS sample noticeable difference of 1025 µε (15.4%) between the lower and upper height levels were registered. Table 2 presents the residual strain values for the studied sample materials.