PSI - Issue 59

Mykola Roshchuk et al. / Procedia Structural Integrity 59 (2024) 718–723 Mykola Roshchuk et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Table 1. Scope of experimental wood research under the influence of different aqueous environments. Wood species Type of soak Soaking time, days Number of samples, pcs Spruce - 0 6

Spruce Spruce

River water Sea water

180 180

6 6 6 6 6 6 6 6

Pine Pine Pine Oak Oak Oak

-

0

River water

180 180

Sea water

-

0

River water

180 180

Sea water

The experimental testing of impregnated samples is presented in Figure 1a, 1b.

a

b

Figure 1. Experimental investigation of impregnated samples: (a) failure of pine sample soaked in river water; (b) testing of pine sample soaked in sea water. 3. Results and discussion To determine the main mechanical parameters in the pre-critical and supercritical stages of material operation, experimental studies of spruce, pine, and oak wood were carried out at a standard moisture content of 12% and impregnated in river and sea water for 180 days under axial compression along the fibers. Stress-strain diagrams based on experimental results were plotted (Fig. 2a,b). Based on the conducted experiment, the main strength and deformation characteristics were determined, namely: ultimate strength f c,0,d, ; elasticity modulus E ; and critical deformations u c,0,d . (Table 2). The elasticity modulus of soaked and unsoaked wood was determined using the methodology provided by Yasniy et al. (2022).