PSI - Issue 81

Oleg Vereshko et al. / Procedia Structural Integrity 81 (2026) 339–345

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a) u c,fin, agr , М Pa

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5

Birch Pine

0

30

60

90

120

150

180

Т, days

b) u c,fin, agr , М Pa

Birch Pine

0

30

60

90

120

150

180

Т, days

c) u c,fin, agr , М Pa

Birch Pine

0

30

60

90

120

150

180

Т, days

Fig. 2. Graphs showing changes in residual deformations of pine and birch wood with different impregnation times after exposure to various acids: a) acetic (9%), b) lactic (40%), c) hydrochloric (15%)