Abstract
This paper aims to introduce a relationship between the dynamic modulus of elasticity in healthy standing trees of Paulownia fortune (planted in Iran) and the static modulus of elasticity in sawn wood. For this reason, a stress-wave non-destructive testing technique was carried out in longitudinal and transverse directions in 14 trees into two diameter classes (25-31 cm and 32-38 cm) at breast height and in logs at different height of stem to measure the stress wave speed and consequently, dynamic modulus of elasticity. Then, static modulus of elasticity of samples was calculated using 3-point bending tests in the sawn wood. The results revealed that the stress-wave speed and dynamic modulus of elasticity in logs of paulownia are more than those of standing trees in longitudinal direction. Also, the diameter of the tree can significantly affect the stress wave velocity in standing trees and logs of paulownia. Finally, a high correlation coefficient exists between static modulus of elasticity and dynamic modulus of elasticity (r= 0.68) in this tree. Keywords: Modulus of elasticity, non-destructive testing, Paulownia, standing trees, stress-wave
Highlights
In Iran, the available forest area is exceptionally limited, and the commercial volume of trees and sawn wood has created a special challenge for many groups, including the government and private sectors
This study aims to determine the MOEd in standing trees and logs of 20 years Paulownia fortune and examine its relationship with the modulus of elasticity (MOEs) of sawn wood
Dynamic modulus of elasticity (MOEd) The results presented in Table 2 show that, in tree, the average amount of MOEd in the longitudinal direction (1547 MPa) is higher than that in the transverse direction (359 MPa)
Summary
In Iran, the available forest area is exceptionally limited, and the commercial volume of trees and sawn wood (that are available for commercial purposes and industrial applications) has created a special challenge for many groups, including the government and private sectors. The Iranian government has established some road maps to increase the source of cellulosic materials and forest areas. This aim can only be achieved by employing (1) scientific silviculture and forest management to control the size, age, and quality of trees; (2) technological properties of their proceed woods; and (3) sustainable forest resources (Baar et al 2015, Ghanbari et al 2014, Macdonald and Hubert 2002). Paulownia fortune, which is a native species to China, Laos, and Vietnam, is imported to Iran, where limited studies during the last 20 years have shown its considerable properties and its ecological compatibility with conditions in Iran.
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