PSI - Issue 81

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

342

a) u c,0,d, agr , М Pa

0.007

0.006

0.005

0.004

0.003

0.002

Birch

0.001

Pine

0

0

30

60

90

120

150

180

Т, days

b) u c,0,d, agr , М Pa

0.007

0.006

0.005

0.004

0.003

0.002

Birch

0.001

Pine

0

0

30

60

90

120

150

180

Т, days

c) u c,0,d, agr , М Pa

0.007

0.006

0.005

0.004

0.003

0.002

Birch

0.001

Pine

0

0

30

60

90

120

150

180

Т, days

Fig. 1. Graphs showing changes in critical deformations of pine and birch wood with different impregnation times after exposure to various acids: a) acetic (9%), b) lactic (40%), c) hydrochloric (15%)