Determination of Screw Withdrawal Resistance of Some Heat-Treated Wood Species

Perçin, Osman; Yaşar, Şekip Şadiye; Altunok, Mustafa; Uzun, Oğuzhan

doi:10.5552/drind.2017.1630

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…The arrangement of the voids and fibers could prevent the screw from having proper hold on the material. Tangential and cross-section behaviour variation was also seen by [17] in their screw withdrawal study. Screw withdrawal values for cross-section tend to be lower.…”

Section: Table I: the Average Of The Maximum Load For The Screw Withdmentioning

confidence: 77%

Screw Withdrawal Properties of Kelampayan and Sesendok Glue Laminated Timber

Rahman*,

Sajali,

Yunus*

2019

IJEAT

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Glue-laminated timbers were produced using two species, Kelampayan and Sesendok. Polyvinyl Acetate (PVAc) was used as binder for the glue-laminated timber manufacturing. Screws with same diameter (3.5mm) and length (50mm), but with different angle and distance of pitch were used. The screw-withdrawal test position was selected for 3 direction designated as the surface, front and side. The test result found that both of pitches of screws are suitable for Kelampayan species. In side position, Kelampayan species showed the best screw holding strength and this result is followed by Sesendok species. In surface position, Pitch 2 has highest withdrawal strength for the Kelampayan species. In all position, Pitch 1 is suitable for Sesendok species and Pitch 2 is suitable for Kelampayan species. In both of pitches, Kelampayan attained higher withdrawal strength when compared to Sesendok.

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Section: Table I: the Average Of The Maximum Load For The Screw Withdmentioning

confidence: 77%

Screw Withdrawal Properties of Kelampayan and Sesendok Glue Laminated Timber

Rahman*,

Sajali,

Yunus*

2019

IJEAT

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“…Heat treatment parts screw withdrawal strength values were highest results in the tangential direction than transverse directions [17]. Density of wood may have a decisive importance for screw withdrawal resistance [18].…”

Section: Introductionmentioning

confidence: 92%

Some Physical and Mechanical Properties of Impregnated Chestnut Wood with Natural and Chemical Agent Exposed to Outdoor Conditions

Yaşar¹,

Altunok²

2018

Journal of Polytechnic

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Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Yaşar M. ve Altunok M., "Some physical and mechanical properties of impregnated chestnut wood with natural and chemical agent exposed to outdoor conditions", Politeknik Dergisi, 22(2): 399-406, (2019).Erişim linki (To link to this article): http://dergipark.gov.tr/politeknik/archive ABSTRACT Wood preservatives have been widely used to extend the service life of wood. The most objectionable environment for wood is outdoor conditions. In this study, test specimens prepared from chestnut wood (Castanea sativa Mill) were impregnated with natural and chemical impregnation agent. It was aimed to determine the effect of outdoor conditions on physical and mechanical properties of wood material by keeping them under these conditions for one year. As natural impregnation material pine tannin and acorn tannins, as chemical impregnation material imersol aqua and timbercare aqua were used. The retention amount, air-dried density, bending strength, modulus of elasticity, compression strength parallel to fibers, adhesion strength parallel to fibers, screw withdrawal strength were determined. As a result, it can be said that the physical and mechanical test values can compare wood impregnated with natural impregnation materials to wood impregnated with chemical impregnation materials after one year exposed to outdoor conditions. Anahtar Kelimeler: Outdoor conditions, chestnut, pine tannin, acorn tannin, mechanical tests. Açık Koşullarına Bırakılan Doğal ve Kimyasal Maddelerle Emprenye Edilen Kestane Odununun BazıFiziksel ve Mekanik Özellikleri ÖZ Ahşap koruyucular, ahşabın kullanım ömrünü uzatmak için yaygın şekilde kullanılmaktadır. Ağaç için en sakıncalı ortam açık hava koşullarıdır. Bu çalışmada, kestane (Castanea sativa Mill) ağacından hazırlanan örnekler doğal ve kimyasal emprenye maddesi ile emprenye edilmiştir. Açık hava koşullarının ağaç malzemenin fiziksel ve mekanik özelliklerine etkisini, bir yıl boyunca bu koşullar altında tutarak belirlenmesi amaçlandı. Doğal emprenye materyali olarak çam taneni ve meşe palamudu taneni, kimyasal emprenye maddesi olarak imersol aqua ve timbercare aqua kullanılmıştır. Retensiyon miktarı, hava kurusu yoğunluk, eğilme direnci, elastikiyet modülü, liflere paralel basınç direnci, liflere paralel yönde yapışma direnci, vida tutma direnci belirlenmiştir. Sonuç olarak, doğal emprenye maddeleriyle emprenye edilen ahşap malzemelerin kimyasal emprenye maddeleri ile emprenye edilen ahşap malzemeler ile bir yıl süreyle açık hava koşulları altındaki değerlerin mukayese edilebilir düzeyde olduğu söylenebilir.

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Mechanical properties of branch and stem wood for two Mediterranean cultivars of olive tree

Mammoliti,

Cataldo,

Papandrea

et al. 2024

J Wood Sci

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There is currently a strong interest in wood and the demand for this material is expected to grow significantly worldwide. Consequently, market demand for wood from fruit orchards is growing as an additional source of supply. For these reasons, several studies were conducted to evaluate the properties of wood derived by orchard pruning or dismantling. Despite the abundance of raw materials from pruning, the mechanical properties of olive wood have not been studied completely by the scientific community, so the woody material obtained is usually considered waste or firewood. In fact, there is still a lack of knowledge about olive wood characteristics and considering the valuable role of olive species in the Mediterranean area, the current study aimed to determine and compare the physical and mechanical properties of branches and stem wood of two olive tree cultivars, “Sinopolese” and “Ottobratica”, to provide information on this wood species. These two olive cultivars are commonly cultivated in the Calabria region (Southern Italy) for the extraction of oil from drupes, but large masses of wood are derived from their pruning. For the choice of parts, the stem was considered to become a branch when, above each branch intersection, it changed in diameter and direction of growth. The branches with a diameter lower than 20 cm were excluded. The tests conducted for this purpose were: Roughness profile; Impact wave; Vibrational analysis; Static modulus of elasticity; Bending strength; Abrasion resistance; Static hardness; Footprints; Compression strength; Screw withdrawal resistance parallel to grain; Screw withdrawal resistance perpendicular to grain. A MANOVA analysis was conducted between the Cultivar-Tree part and the physical and mechanical properties. The results showed some differences between the two cultivars principally related to mechanical properties such as moduli of elasticity and rupture, footprint, compression strength, and screw withdrawal resistances, where in general, the “Sinopolese” cultivar showed higher values than the “Ottobratica”. Between the tree parts (stem and branches) within the same cultivars, branches demonstrated higher results in the majority of the tests, but highlighting statistical differences only in terms of static modulus of elasticity, bending strength, static hardness and screw withdrawal resistances depending on the cultivar. This result suggests that the branch wood, with its characteristics, could be valorized in the commercial utilization representing a valid opportunity for the local rural economy, even considering the conspicuous amount of wood obtained from olive pruning activity. Expanding knowledge about olive wood in terms of physical and mechanical characteristics could increase its use in multiple sectors and ensure a more aware use of the application of the wood resources by supporting the decision on its best end use.

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Determination of Screw Withdrawal Resistance of Some Heat-Treated Wood Species

Cited by 5 publications

References 14 publications

Screw Withdrawal Properties of Kelampayan and Sesendok Glue Laminated Timber

Screw Withdrawal Properties of Kelampayan and Sesendok Glue Laminated Timber

Some Physical and Mechanical Properties of Impregnated Chestnut Wood with Natural and Chemical Agent Exposed to Outdoor Conditions

Mechanical properties of branch and stem wood for two Mediterranean cultivars of olive tree

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