The Effect of Wood Species and Strip Width on Bending Strength and Modulus of Elasticity in End-Grain Core Blockboard

Year 2022, Volume: 18 Issue: 1, 9 - 16, 25.03.2022

Yasemin Öztürk , Kıvanç Yılmaz , Erol Burdurlu

https://doi.org/10.18466/cbayarfbe.958377

Abstract

It is aimed to compare the bending strength and modulus of elasticity of end-grain (vertical strip) core blockboard, unlike the usual (lengthwise strip core) blockboard construction, with that of the traditional blockboard with the face-grain or edge-grain core construction. Oriental beech and black poplar woods are provided by taking care to avoid the grain irregularities and visible defects are used in the study. These timbers are used to obtain the core, top and bottom layers of the blockboard. PVAc mounting glue is used for bonding the layers together. According to the test data: The bending strength and modulus of elasticity of oriental beech blockboard are 39% and 26% higher respectively than that of end-grain core black poplar blockboards. If we evaluated by neglecting wood species, strip width was an effective factor in the bending strength and ineffective modulus of elasticity. In addition, the bending strength of the end-grain core oriental beech blockboard is 79 MPa and that of the end-grain core black poplar blockboard is 57 MPa, regardless of the width of the core strip. When these values are compared with the values of other engineered wood, the result is considered open to improvement and satisfactory.

Keywords

Blockboard, Core Structure, Wooden Board, Bending Strength, Modulus of Elasticity

References

• Referans1 TSE, TS 1047 - Blockboards for general purposes-with rotary cut veneer. Turkey: Turkish Standardization Institute(TSE), 1982.
• Referans2 R. F. S. Hearmon, “Elasticity of Wood and Plywood,” Nature, vol. 162, no. 4125, pp. 826–826, Nov. 1948, doi: 10.1038/162826a0.
• Referans3 A. Dzięgielewski, St. Wilczyński, “Elasticity of furniture elements glued by layers,” Zesz. Probl. Postępów Nauk Rol., vol. 379, pp. 89–107, 1990.
• Referans4 J. Smardzewski, “Effect of wood species and glue type on contact stresses in a mortise and tenon joint,” Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci., vol. 222, no. 12, pp. 2293–2299, Dec. 2008, doi: 10.1243/09544062JMES1084.
• Referans5 M. Fakoor and R. Rafiee, “Transition angle, a novel concept for predicting the failure mode in orthotropic materials,” Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci., vol. 227, no. 10, pp. 2157–2164, Oct. 2013, doi: 10.1177/0954406212470905.
• Referans6 M. Nazerian, V. Moazami, S. Farokhpayam, and R. M. Gargari, “Production of blockboard from small athel slats end-glued by different type of joint,” Maderas Cienc. y Tecnol., vol. 20, no. 2, pp. 277–286, 2018, doi: 10.4067/S0718-221X2018005021101.
• Referans7 C. Segovia, X. Zhou, and A. Pizzi, “Wood blockboards for construction fabricated by wood welding with pre-oiled dowels,” J. Adhes. Sci. Technol., vol. 27, no. 5–6, pp. 577–585, Mar. 2013, doi: 10.1080/01694243.2012.690616.
• Referans8 B. Belleville, C. Segovia, A. Pizzi, T. Stevanovic, and A. Cloutier, “Wood Blockboards Fabricated by Rotational Dowel Welding,” J. Adhes. Sci. Technol., vol. 25, no. 20, pp. 2745–2753, Jan. 2011, doi: 10.1163/016942410X537323.
• Referans9 M. Haseli, M. Layeghi, and H. Zarea Hosseinabadi, “Characterization of blockboard and battenboard sandwich panels from date palm waste trunks,” Measurement, vol. 124, no. December 2017, pp. 329–337, Aug. 2018, doi: 10.1016/j.measurement.2018.04.040.
• Referans10 H. El-Mously, Rediscovering Date Palm by-products: an Opportunity for Sustainable Development, Materials Research Forum LLC, Materials Research Proceedings 11, 3-61, 2019, doi: 10.21741/9781644900178-1
• Referans11 M. Ispas, C. Cosereanu, O. Zeleniuc, and M. Porojan, “Flexural properties of blockboard reinforced with glass fiber and various types of fabrics,” BioResources, vol. 14, no. 4, pp. 9882–9892, 2019, doi: 10.15376/biores.14.4.9882-9892.
• Referans12 S. N. Kartal and N. Ayrilmis, “Blockboard with boron-treated veneers: laboratory decay and termite resistance tests,” Int. Biodeterior. Biodegradation, vol. 55, no. 2, pp. 93–98, Mar. 2005, doi: 10.1016/j.ibiod.2004.08.001.
• Referans13 T. Laufenberg, N. Ayrilmis, R. White, " Fire and bending properties of blockboard with fire retardant treated veneers," Holz als Roh - und Werkstoff , 137-143, 64(2), (2006), doi: https://doi.org/10.1007/s00107-005-0041-4
• Referans14 G. M. Raftery and A. M. Harte, “Low-grade glued laminated timber reinforced with FRP plate,” Compos. Part B Eng., vol. 42, no. 4, pp. 724–735, Jun. 2011, doi: 10.1016/j.compositesb.2011.01.029.
• Referans15 H. Altenbach, “Mechanics of advanced materials for lightweight structures,” Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci., vol. 225, no. 11, pp. 2481–2496, Nov. 2011, doi: 10.1177/0954406211417068.
• Referans16 TSE, TS 2474 - Wood-determination of ultimate strength in static bending. Turkey: Turkish Standardization Institute(TSE), 1976.
• Referans17 TSE, TS 2478 - Wood-Determination of Modulus of Elasticity In Static Bending. Turkey: Turkish Standardization Institute(TSE), 1976.
• Referans18 D. B. Wright and J. A. Herrington, “Problematic standard errors and confidence intervals for skewness and kurtosis,” Behav. Res. Methods, vol. 43, no. 1, pp. 8–17, Mar. 2011, doi: 10.3758/s13428-010-0044-x.
• Referans19 H. Efe and A. Kasal, “Determination of Some Physical and Mechanical Properties of Various Wood and Wood Composite Materials,” J. Polytech., vol. 10, no. 3, pp. 303–311, 2007, [Online]. Available: https://dergipark.org.tr/tr/pub/politeknik/issue/33026/367180.
• Referans20 M. Altınok and A. Kılıç, “Determination of some mechanical performances of particle board covered with roll(continue press laminate) laminate,” Gazi Univ. J. Sci., vol. 16, no. 3, pp. 559–566, 2003, [Online]. Available: https://dergipark.org.tr/tr/pub/gujs/issue/7405/97150#article_cite.