Sedir Odununun (Cedrus libani A.) Elastik Sabitleri
Küçük Resim Yok
Tarih
2022
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bartin University
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Günümüzde kullanılan bilgisayar destekli tasarım ve üretim sistemlerinde ahşap malzemenin optimum tasarımının yapılabilmesi için tüm elastik sabitlerinin bilinmesi gerekir. Ortotropik bir malzeme olan ahşabın bu sistemlere entegrasyonu için dokuz elastik sabite ihtiyaç vardır. Bu çalışmada, Sedir (Cedrus libani A.) odununun sabit sıcaklık ve rutubet koşullarında elastik sabitleri incelenmiştir. Elastik sabitler basma testleri uygulanan 20 x 20 x 60 mm ebatlarındaki örneklerden elde edilmiştir. İncelenen özellikler; lif yönü, radyal ve teğet yönlerde elastik modülü (EL, ER, ET) üç ana düzlemde kayma modülü (GLR, GLT, GRT) ve altı Poisson oranından (?LR, ?LT, ?RL, ?RT, ?TL, ?TR) oluşmaktadır. Deney örneklerinin üç farklı lif yönündeki basınç dirençleri de çalışmada belirlenmiştir. Yükleme sırasında meydana gelen şekil değişmeleri çift eksenli ekstansometre kullanılarak ölçülmüştür. Elastik sabitler, gerilme-şekil değiştirme eğrileri kullanılarak hesaplanmıştır. Sedir odununda belirlenen EL, ER, ET değerleri sırasıyla 7800, 890 ve 670 N/mm2, GLR, GLT, GRT değerleri ise sırasıyla 836, 780, 156 N/mm2 ve Poisson oranları ise 0.052 ile 0.522 arasında değişmektedir. Çalışmada bulunan elastik sabitler, sedir odununun nümerik modellenmesinde kullanılabilir.
In order to make the optimum design of wood material in computer aided design and production systems used today, all elastic constants must be known. Nine elastic constants are needed for the integration of wood which is an orthotropic material into these systems. In this study, elastic constants of Cedar (Cedrus libani A.) wood were investigated at constant temperature and relative humidity conditions. Elastic Constants were obtained from samples of 20 x 20 x 60 mm in compression tests. Three elastic moduli (EL, ER, ET) in principal directions, three shear modulus in the LR, LT and TR planes and six Poisson’s ratios (?LR, ?LT, ?RL, ?RT, ?TL, ?TR) were evaluated. Compression strength of the specimens in L, R and T directions were also calculated. Strains occurred during loading were measured using bi-axial extensometer. Elastic constants were calculated from the load-deformation curves. EL, ER, ET values determined in cedar wood were 7800, 890 and 670 N/mm2, GLR, GLT, GRT values were 836, 780, 156 N/mm2, and Poisson ratios ranged between 0.052 and 0.522, respectively. The compressive strengths in the L, R and T directions were found as 44.1, 8.6 and 7.6 N/mm2, respectively. Properties found in the study can be used in numerical modelling of cedar wood.
In order to make the optimum design of wood material in computer aided design and production systems used today, all elastic constants must be known. Nine elastic constants are needed for the integration of wood which is an orthotropic material into these systems. In this study, elastic constants of Cedar (Cedrus libani A.) wood were investigated at constant temperature and relative humidity conditions. Elastic Constants were obtained from samples of 20 x 20 x 60 mm in compression tests. Three elastic moduli (EL, ER, ET) in principal directions, three shear modulus in the LR, LT and TR planes and six Poisson’s ratios (?LR, ?LT, ?RL, ?RT, ?TL, ?TR) were evaluated. Compression strength of the specimens in L, R and T directions were also calculated. Strains occurred during loading were measured using bi-axial extensometer. Elastic constants were calculated from the load-deformation curves. EL, ER, ET values determined in cedar wood were 7800, 890 and 670 N/mm2, GLR, GLT, GRT values were 836, 780, 156 N/mm2, and Poisson ratios ranged between 0.052 and 0.522, respectively. The compressive strengths in the L, R and T directions were found as 44.1, 8.6 and 7.6 N/mm2, respectively. Properties found in the study can be used in numerical modelling of cedar wood.
Açıklama
Anahtar Kelimeler
Forest Industry Engineering, Orman Endüstri Mühendisliği
Kaynak
Bartın Orman Fakültesi Dergisi
Journal of Bartin Faculty of Forestry
Journal of Bartin Faculty of Forestry
WoS Q Değeri
Scopus Q Değeri
Cilt
24
Sayı
3
