The effect of load and relative humidity on bending creep behaviour of hornbeam in three altitudes (Case study: Nowshahr Meshelak habitat)

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Moosavi v.; NAJAFI A.; Kiaie M.

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Journal: IRANIAN JOURNAL OF WOOD AND PAPER INDUSTRIES Year:2018 | Volume:9 | Issue:1 Page(s): 15-26

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Title

The effect of load and relative humidity on bending creep behaviour of hornbeam in three altitudes (Case study: Nowshahr Meshelak habitat)

Author(s)

Moosavi v. | NAJAFI A. | Kiaie M. | Issue Writer Certificate

Keywords

hornbeamQ3

altitudeQ1

loadQ1

relative humidityQ1

creep/recoveryQ1

creep modulusQ1

relative creepQ1

Abstract

This study aimed to investigate the effect of load and relative humidity on the bending creep behaviour of hornbeam lumber (Carpinus betulus) in three altitudes. For this purpose, nine hornbeam trees at altitudes of 400, 800 and 1100 meters above sea level were selected from the forestry projects of Meshelak Nowshahr. From mature wood at breast height diameter of trees, 324 clear samples were cut. The prepared samples with the dimensions of 2. 5 × 2. 5 × 41cm were conditioned in a room with the temperature of 20 C and relative humidity (RH) of 35, 65 and 95 %. After three weeks of conditioning, three points bending test was done for determining the maximum of bending load on 81 samples. 10, 20 and 30% maximum of bending load (MBL) were measured and then four points bending creep test was measured for determining creep parameters on 243 samples at times period of 14 hours loading and 10 hours unloading in acclimatized room conditions. Finally, creep/recovery, creep modulus and relative creep of samples were calculated. Results indicated that the effects of load and relative humidity on creep parameters was significant; the maximum and the minimum relative creep were observed in 95 and 35% RH, respectively and the maximum and the minimum creep modulus were observed in 35 and 95% RH, respectively. The maximum and minimum relative creeps were observed in 30 and 10% MBL, respectively and the maximum and minimum creep modulus were observed in 10 and 30% MBL, respectively. Results also showed that the increasing of bending properties caused a decrease in the creep parameters.

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APA: Copy

Moosavi, v., NAJAFI, A., & Kiaie, M.. (2018). The effect of load and relative humidity on bending creep behaviour of hornbeam in three altitudes (Case study: Nowshahr Meshelak habitat). IRANIAN JOURNAL OF WOOD AND PAPER INDUSTRIES, 9(1 ), 15-26. SID. https://sid.ir/paper/184279/en

Vancouver: Copy

Moosavi v., NAJAFI A., Kiaie M.. The effect of load and relative humidity on bending creep behaviour of hornbeam in three altitudes (Case study: Nowshahr Meshelak habitat). IRANIAN JOURNAL OF WOOD AND PAPER INDUSTRIES[Internet]. 2018;9(1 ):15-26. Available from: https://sid.ir/paper/184279/en

IEEE: Copy

v. Moosavi, A. NAJAFI, and M. Kiaie, “The effect of load and relative humidity on bending creep behaviour of hornbeam in three altitudes (Case study: Nowshahr Meshelak habitat),” IRANIAN JOURNAL OF WOOD AND PAPER INDUSTRIES, vol. 9, no. 1 , pp. 15–26, 2018, [Online]. Available: https://sid.ir/paper/184279/en

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