PSI - Issue 81

Oleksandr Svyrydiuk et al. / Procedia Structural Integrity 81 (2026) 504–508

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stage was accompanied by local deformations, the appearance of microcracks in the wood structure, and partial loss of adhesive bonding between veneer layers. Further load increase caused unstable deformations and stress concentration in weakened zones. Macrocracks formed, leading to the loss of load-bearing capacity. The failure of composite prisms was generally brittle – plastic. It was accompanied by material delamination, crushing of wood fibers, and local splitting along the loading direction.

a

b

Fig. 3. Failure features of the tested prisms: (a) prism P-2; (b) prism P-5

The obtained results indicate a significant influence of the multilayer structure and the quality of veneer bonding on the mechanical behavior of the samples. These factors must be considered when evaluating their strength and deformation

characteristics. 4.Conclusions

1. As a result of the experimental studies, the mechanical properties of composite prisms made of wood veneer under axial compression along the fibers with a single short-term load were determined. The ultimate strength, relative critical strains, and relative residual strains were identified for both the pre-critical and post- critical stages of the material’s behavior. 2. The failure of the prisms is brittle – plastic. It includes local macrocracks, delamination of veneer layers, and crushing of wood fibers. This emphasizes the importance of the multilayer structure and the quality of bonding for ensuring the strength of the composite material. 3. The research results showed that the industrial method of manufacturing prisms with controlled veneer layer thickness and adherence to the technological process ensures stable physical and mechanical properties and high reproducibility of experimental results. 4. The obtained data can be used for designing structural elements made of wood veneer. They are also useful for evaluating strength and deformation characteristics as well as for further studies on the influence of multilayer structure and interlayer adhesion on the mechanical behavior of composite materials. References Abolore, R.S., Jaiswal, S., Jaiswal, A.K., 2025. A comprehensive review on sustainable lignin extraction techniques, modifications, and emerging applications. Ind. Crop. Prod. 235 , 121696. Aleksiievets, V., Gomon, S., Aleksiievets, I., Homon, S., Ivaniuk, A., Zadorozhnikova, I., Bandura, I., 2024. Influence of thicknesses of outer and middle elements on the performance of nail connections. Procedia Structural Integrity 59, 710-717. Andor, K., Bellovics, B., 2020. Analysis of modulus of elasticity of spruce beams under bending with and without fibre reinforcement. Wood research 65(1), 101 110. Bula, S. and Pelekh, A., 2023. Comparing the efficiency of strengthening timber beams reinforced with carbon composite rods and plates. Eastern-European Journal of Enterprise Technologies 5(7-125), 14 – 22 2023. Correal, J. F., Echeverry, J. S., Ramírez, F., Yamín, L. E., 2014: Experimental evaluation of physical and mechanical propert ies of Glued Laminated Guadua angustifolia Kunth. Construction and Building Materials 73, 105- 112. Datsiuk, V., Homon, S., Gomon, S., Dovbenko, V., Petrenko, O., Parfentyeva, I., Romaniuk, M., 2024. Effect of long-term operation on the strength properties of pine wood. Procedia Structural Integrity 59, 583-587. Diza Lestari, A. S. R., Hadi, Y. S., Hermawan, D., Santoso, A., 2018: Physical and mechanical properties of glued laminated lumber of pine (Pinus merkusii) and jabon (Anthocephalus cadamba). Journal of the Korean Wood Science and Technology 46 (2), 143-148.