PSI - Issue 59

Sviatoslav Homon et al. / Procedia Structural Integrity 59 (2024) 545–550 Sviatoslav Homon et al. / Structural Integrity Procedia 00 (2019) 000 – 000

548

4

b σ c , МРа

0 10 20 30 40 50 60

Larch Pine Spruce

u c

0

0,1

0,2

0,3

0,4

0,5

c σ c , МРа

50

40

Larch Pine Spruce

30

20

10

u c

0

0

0,1

0,2

0,3

0,4

Fig. 1. Deformation diagrams « stress σ с – deformations u c » coniferous wood by age: (a) 60 years; (b) 40 years; (c) 20 years .

The averaged values of ultimate strength, critical and ultimate deformations and modulus of elasticity were obtained based on experimental studies of larch, pine and spruce wood samples at the age of 60, 40, and 20 years with a standard moisture content of 12% (Table 2).

Table 2. Results of experimental studies of coniferous wood of different ages at a standard moisture content of 12%.

Wood species

Wood age, years

Ultimate strength f c,0,d, , МРа

Critical deformation u c,0,d

Residual deformation u c,fin

Elasticity modulus Е, MPa

Larch

60 60 60 40 40 40 20 20 20

59.7 45.3 43.6 56.1 43.1 40.2 44.1 35.8 33.6

0.00640 0.00491 0.00467 0.00626 0.00481 0.00451 0.00534 0.00409 0.00363

0.4499 0.3415 0.3471 0.4357 0.3348 0.3070 0.3781 0.2984 0.2784

13700 12900 14400 13200 12500 13700 12100 11400 12300

Pine Spruce

Larch

Pine

Spruce

Larch

Pine

Spruce