Original scientific paper

https://doi.org/10.5552/drind.2016.1609

Bending Creep Behavior of Hornbeam Wood

Valiullah Moosavi ; Sveučilište Islamic Azad, Zavod za znanost o drvu i papiru i drvnu tehnologiju, Odjel za znanost i istraživanja, Tehran, Iran
Habibollah Khademi Eslam ; Sveučilište Islamic Azad, Zavod za znanost o drvu i papiru i drvnu tehnologiju, Odjel za znanost i istraživanja, Tehran, Iran
Behzad Bazyar ; Sveučilište Islamic Azad, Zavod za znanost o drvu i papiru i drvnu tehnologiju, Odjel za znanost i istraživanja, Tehran, Iran
Abdollah Najafi ; Islamic Azad University, Department of Wood and Paper Science and Technology, Chalous Branch, Chalous, Iran
Mohammad Talaeepoor ; Sveučilište Islamic Azad, Zavod za znanost o drvu i papiru i drvnu tehnologiju, Odjel za znanost i istraživanja, Tehran, Iran

Abstract

This study examined the effect of altitude on bending creep behavior of hornbeam lumber (Carpinus betulus). For this purpose, 9 hornbeam trees from three different altitudes (400, 800 and 1100 m) in the northern forests of Iran were selected. Clear samples were cut from mature wood in diameter at breast height (DBH). 108 prepared samples (dimensions: 2.5 × 2.5 × 41 cm) were conditioned at room temperature of 20 ºC and two relative humidities (RH) of 65 % and 95 %. First, the maximum bending load was determined by three-point static bending tests in acclimatized room and then flexural creep parameters, such as relative creep, creep modulus and creep factor, at 20 % of the maximum bending load, were calculated. Results indicated that at 65 % RH, the effect of altitude on creep parameters was significant. The maximum values of relative creep and creep factor were observed at the altitude of 800 m, and the minimum values at the altitude of 400 m. The maximum values of creep modulus were observed at the altitude of 400 m and the minimum values at the altitude of 800 m. Also, at 95 % RH, the effect of altitude on creep modulus was significant but it was not significant on relative creep and creep factor. The maximum creep modulus was observed at the altitude of 400 and the minimum at the altitude of 800 m.

Keywords

altitude; Carpinus betulus; creep factor; creep modulus; relative creep; relative humidity

Hrčak ID:

172563

URI

https://hrcak.srce.hr/172563

Publication date:

11.1.2017.

Article data in other languages: croatian

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