PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 59 (2024) 545–550

VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Study of the mechanical properties of coniferous wood of different ages at standard humidity Sviatoslav Homon a , Petro Gomon a* , Svyatoslav Gomon a , Serhii Litnitskyi a ,

Inna Boyarska b , Oleksandr Chapiuk b , Natalia Chornomaz c a National University of Water and Environmental Engineering, Soborna 11, 33000 Rivne, Ukraine b Lutsk National Technical University, Lvivska 75, 43018 Lutsk, Ukraine c Ternopil Ivan Puluj National Technical University, Ruska 56, 46001 Ternopil, Ukraine

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract Experimental studies of age effect on the strength and deformation characteristics of coniferous wood of standard humidity on compression along the fibers under a strain-controlled mode were carried out. Valid diagrams « stress σ с – deformations u c » were plotted from the beginning of loading to the failure (ascending and descending branches). The full range of strength and deformation parameters was determined experimentally, both on the ascending and descending branches of the deformation diagram. It was established that the values of ultimate strength, critical and final deformations, and elasticity modulus slightly decrease from 60 to 40 years and significantly from 40 to 20 years. In particular, the average values in the range 60 to 20 years decrease for ultimate strength by 26.5-35.4%; critical deformations – 19.8-28.7%; final deformations – 18.0-24.7%; elasticity modulus – 13.1-17.0%. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Keywords: wood, strength, elasticity modulus, critical and final deformation, « stress-deformation » diagram.

* Corresponding author. Tel.: +380671967786. E-mail address: p.s.homon@nuwm.edu.ua

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.077