Nondestructive evaluation of flexural strength comparing to static bending strength in wood from Pine and Beech

Omrani Ghahjaverstani, Shahrzad; Lashgari, Amir; Roohnia, Mahran

doi:10.22092/ijwpr.2019.125019.1519

Document Type : Research Paper

Authors

¹ M.Sc. Wood and Paper Science and Technology, Islamic Azad University,Karaj Branch,, Karaj Iran.

² Associate professor, Wood and Paper Science and Technology, Islamic Azad University,Karaj Branch,, Karaj Iran.

³ Professor, Wood and Paper Science and Technology, Islamic Azad University,Karaj Branch,, Karaj Iran.

https://doi.org/10.22092/ijwpr.2019.125019.1519

Abstract

Non-destructive tests today play a vital role in human life. Non-destructive evaluation technology is widely used in industries, especially wood based industries and wood based products and has led to advances in Strength grading lumber, determine the disadvantages of wooden materials, Inspection of timber and wooden structures. The purpose of this research was to estimate the flexural strength of dynamic tests and compare them with the results of static standard tests in two Forest Pine species (Pinus sylvestris) and Rush (Fagus orientalis). The results of the comparison of the estimation of the modulus of elasticity and the estimated modulus of rupture by a non-destructive free vibration method in a free supported beam with similar results from the static test showed a very good correlation So, according to calculations done by applying a safety coefficient of 18% for beech species and 11% for pine species, a non-destructive vibration test can be substituted by a static destructive standard test for estimating the factors mentioned in these two species.

Keywords

Main Subjects

Physics and Mechanical Wood

References

-Baillere, B., 2012. Strength grading of pine. BioResources, 7(1): 1264-1282.

-Bodig, J. and Jayne, B., 1982. Mechanics of wood and wood composites (Persian translated by G. Ebrahimi), University of Tehran press, 686 p.

-Bowye, J.L., Shmulsky, R. and Hygreen, J.G., 1942. Forest Products and Wood Science an Introduction (Persian translated V.R. Safdari, S.M. J. Sepidehdam, S.KH. Hoseynihashemi), Islamic Azad University of Karaj Press .805 p.

-Dundar, E., 2012. Wood thermal conductivity. BioResources, 7(3): 3306-3316.

-Divos, F. and Tanaka, T., 1997. Lumber Strength Estimation. Holzforschung, 51: 467-471.

-Divos, F. and Tanaka, T., 2005. Relation between Static and Dynamic MOE of Wood. Acta Silve. Lign. Hung., 1: 105-110.

-Divos, F. and Sismandy Kiss, F., 2010. Strength Grading of Structural Lumber The Future of Quality Control for Wood & Wood Products’, 4-7th May 2010, Edinburgh The Final Conference of COST Action E53.

-EN338 .2003. Structural timber-Strength Glasses.

-Ghofrani, M. and Noori, H., 1393. Physical and Mechanical Properties of Wood. Tehran University Press, Iran Printing & Publishing Company, 181p.

-Hashemi tabalvandi, S M., 2010. Young and Shear moduli, in static and dynamic standard approach. Msc. Thesis, in Islamic Azad University Karaj Branch, 124pp

-ISIRI9854.1386. Structural timber-Machine strength grading-Basic principles.

-ISIRI9850. 1386. Structural timber- Visual strength grading-Basic principles.

-ISO13910. 2005. Structural timber-Characteristic values of strength-graded timber-Sampling, full-size testing and evaluation.

-Karimi, A., Yari, Z., Vaziri, V. and Koshesh, H., 1396. Non-destructive Testing in Wood Industry, Seventh Agricultural and Sustainable Natural Resources Conference, Tehran, Center for Achievement of Sustainable Development- Higher Education Institute of Mehr Arvand.

-Kohantorabi, M., Roohnia, M., Almasian, S. and Zarinmehr, J., 1396. Increase Timber Productivity with Obligation to Machine grading Woodwork. Tenth International Furniture World Trade Conference, Designing, Art decoration and related industries. Tehran, International Broadcasting Center, 12 Azar 1396, 68-75.

-Ross, RJ. and Pellerin, RF.,1991.Non-destructive testing for assessing wood members in structures– a review. General Technical Report FPL-GTR-70. Madison, WI: USDA Forest Service, Forest Product Laboratory. 40 p.

-Roohnia, M., Doosthoseini, K., Khademieslam, H., Gril, J. and Bremaud, I., 2006. A Study on Variations of Specific Modulus of Elasticity and Shear Modulus in Arizona Cypress Wood, using Vibration Method, Journal of the Iranian Natural Res., 59(4): 921-933

-Roohnia, M., Alavi-tabar, S.E., Hossein, M.A. and Brancheriau, L., 2011. Dynamic modulus of elasticity of drilled

wooden beams, Non-destructive Testing and Evaluation, 26(2):141-153

Iranian Journal of Wood and Paper Science Research

Nondestructive evaluation of flexural strength comparing to static bending strength in wood from Pine and Beech

References

References

Volume 34, Issue 2 - Serial Number 67
August 2019
Pages 157-166

Nondestructive evaluation of flexural strength comparing to static bending strength in wood from Pine and Beech

References

References

Volume 34, Issue 2 - Serial Number 67August 2019Pages 157-166

Volume 34, Issue 2 - Serial Number 67
August 2019
Pages 157-166