Ultrasonik dalga yayılımı ve basma testi ile elde edilen doğu kayını odununun (Fagus orientalis L.) sıcaklığa bağlı Young’s modüllerinin karşılaştırılması

Öz

Ahşap malzemenin mekanik özellikleri birçok doğal ve çevresel faktörlere bağlı olarak değişmektedir. Sıcaklık bu faktörlerden biridir ve bu çalışmada sıcaklığın kayın odunu Young’s modülü’ne etkisi incelenmiştir. Lif yönlü (L) basma testi örnekleri 2, 5 ve 8 saat süre boyunca 120, 150, 180 ve 210°C sıcaklığa maruz bırakılmıştır. Sıcaklığa maruz bırakma işleminde atmosferik ortamda çalışan etüv kullanılmıştır. Statik ve dinamik Young’s modülü değerleri basma testi ve ultrasonik dalga yayılımı yöntemleri ile belirlenmiştir. Ultrasonik ölçümlerin başarısını belirlemek için elde edilen sonuçlar birbirleri ile regresyon analizi ile karşılaştırılmıştır. 20x20x60 mm ölçülerindeki tüm test örnekleri 20±2°C sıcaklık ve %65 bağıl nem koşullarında iklimlendirilmiştir. Test edilen örneklerin deformasyon verileri bi-aksiyal ekstensometre kullanılarak elde edilmiştir ve sonrasında gerilme-şekil değiştirme eğrileri oluşturulmuştur. Statik Young’s modülü değerleri gerilme-şekil değiştirme eğrilerinin doğrusal elastik bölgesindeki gerilme-şekil değiştirme verilerinden hesaplanmıştır. Edyn ultrasonik dalga hızı ve örnek yoğunluğundan tahmin edilmiştir. Hızlar, ultrasonik ölçümler ile elde edilen dalga uçuş süreleri kullanılarak hesaplanmıştır. Sıcaklık ve süre bağlamında dinamik ve statik elastikiyet modülleri arasındaki kabul edilebilir ve iyi dereceli ilişkiler 0.78 ile 0.94 arasında değişen belirtme katsayıları ile belirlenmiştir. Sonuç olarak sıcaklığa maruz bırakılmış doğu kayını odununun L yönündeki Young’s modülü ultrasonik ölçümler ile iyi bir şekilde tahmin edilebilir.

Anahtar Kelimeler

• Doğu kayını,Young’s modülü,Tahribatsız muayene,Ultrasonik

Comparison of temperature dependent Young’s modulus of oriental beech (Fagus orientalis L.) that determined by ultrasonic wave propagation and compression test

Öz

Mechanic properties of wood material change depending on lots of natural and environmental factors. Temperature is one of these factors and in this study, effect of temperature on Young’s modulus of Oriental beech wood was investigated. Longitudinal direction (L) compression test samples exposed to 120, 150, 180 and 210°C temperature for 2, 5 and 8 hours. A drying oven that operates in an atmospheric environment was used for temperature treatment. Static and dynamic Young’s modulus values were determined or predicted by compression test and ultrasonic wave propagation method, respectively. Results compared with each other by regression analysis to determine how successful the ultrasonic measurement is. All test samples, 20x20x60 mm, acclimatized at 20 ±2°C and 65% RH conditions. Deformation values of the tested samples were obtained by using bi-axial extensometer and then stress-strain curves were created. Static Young’s modulus was calculated by using stress-strain values from the linear elastic region of these curves. Edyn was predicted by using ultrasonic wave velocity and sample density values. Velocities were calculated by using time of flight values obtained by ultrasonic measurements. Reasonable and good relations between dynamic and static modulus of elasticity were determined by the coefficient of determination results that ranged from 0.78 to 0.94 in terms of temperature and exposure duration. Consequently, L direction Young’s modulus of Oriental beech wood that exposed to temperature can be well predicted by using ultrasonic measurement.

Anahtar Kelimeler

• Oriental beech,Young’s modulus,Non-destructive test,Ultrasonic

Kaynakça

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