Toros sediri odununun eğilme özellikleri üzerine ısıtma sıcaklığı ve süresinin değerlendirilmesi

Öz

Isıl işlem, ağaç malzeme özelliklerinin geliştirilmesinde kullanılan çevre dostu ve uygun maliyetli modifikasyon yöntemlerinden biridir. Fakat özelliklerde dengeli iyileşmeler sağlayabilmek için sıcaklık ve işlem süresi etkilerinin bilinmesi gereklidir. Bu çalışmada, sıcaklık (80, 120, 150, 180 ve 210°C) ve işlem süresinin (2, 5 ve 8 saat) Toros sediri (Cedrus libani) odununda boyuna ultrasonik dalga hızı, yoğunluk, dinamik elastikiyet modülü (Edyn), eğilmede elastikiyet modülü ve eğilme direnci üzerine etkisi incelenmiştir. Edyn lif doğrultusunda yayınım gerçekleştirilen 2.25 MHz frekanslı boyuna ultrasonik dalganın ses hızı ile tahmin edilmiştir. Üç nokta eğilme testi ile statik mekanik değerler belirlenmiştir. Sonuçlara göre yoğun işlem süresi ve sıcaklığın olumsuz yönde en yüksek etkisi eğilme direncinde görülmüş ve bunu dinamik ve statik elastikiyet modülleri takip etmiştir. 150°C'ye kadar ve 8 saatlik işlem seviyelerinde, özellikle eğilmede elastikiyet modülü için bazı kayda değer iyileşmeler (%15.3) görülmüştür. Edyn ile eğilmede elastikiyet modülü, Edyn ile eğilme direnci ve eğilmede elastikiye modülü ile eğilme direnci arasındaki determinayson katsayıları sırası ile 0.83, 0.38 ve 0.37 olarak hesaplanmıştır.  

Anahtar Kelimeler

• Sedir
• Ultrases
• Elastikiyet modülü
• Eğilme direnci

Evaluation of heating temperature and time on bending properties of Taurus cedar wood

Öz

Heat treatment is one of the environmentally friendly and cost-effective modification methods applied for improvements of wood properties. However, influences of exposure duration and temperature should be known to provide balanced improvements for properties. In this study, effect of temperature (80, 120, 150, 180, and 210°C) and exposure duration (2, 5, and 8 h) on the longitudinal ultrasonic wave velocity, density, dynamic Modulus of Elasticity-MOE (Edyn), MOE in bending, and Modulus of Rupture (MOR) properties of Taurus cedar (Cedrus libani) was figured out. Edyn was predicted using ultrasonic wave velocity of 2.25 MHz longitudinal ultrasonic wave propagated through the longitudinal axis. The three-point bending test was performed to determine static mechanical properties. According to results, the highest adverse effects of extended duration and temperature were observed for MOR and followed by Edyn, and MOE in bending. Up to 150°C and 8 h treatment levels, some remarkable increases (15.3%) were observed particularly for MOE in bending. Coefficients of determinations were calculated as 0.83, 0.38, and 0.37 for Edyn vs MOE in bending, Edyn vs MOR, and MOE in bending vs MOR, respectively.

Anahtar Kelimeler

• Cedar
• Ultrasound
• Modulus of elasticity
• Modulus of rupture

Kaynakça

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