Elastic Properties ofEucalyptus pilularisSm. Perpendicular to the Grain. I. In Tension

Variation of perpendicular compressive strength properties related to anatomical structure and density in Eucalyptus nitens green specimens

“…The average modulus of elasticity in compression perpendicular to the fiber for the E. nitens was 2.3 GPa, with minimum and maximum values of 1.1 and 3.6 GPa, respectively, and a standard deviation of 0.5. These values are much higher than those reported in literature for other older species of the Eucalyptus genus (Alexiou 1994;Nogueira et al 2018a,b). Table 1 shows that there were statistically significant differences between inner-wood and outer-wood, but these differences were not significant as the differences between inner-wood and middle-wood, and between middle-wood and outerwood.…”

“…The basic density is particularly important because it highly affects the manufacturing processes and provides in general a good estimation of the mechanical strength (Prado and Barros 1989). Likewise, some authors affirm that, besides the density, the compressive behavior of wood is strongly dependent on its anatomical characteristics such as cell length, cell wall thickness, fiber diameter, and microfibril angle (MFA) (Alexiou 1994;Evans and Ilic 2001;Müller et al 2003). According to Evans and Ilic (2001), there is a strong relationship between the MFA and the modulus of elasticity (E) of Eucalyptus wood, and they point out that the MFA is the main factor that affects the E of the wood.…”

Elastic Properties of Eucalyptus pilularis Sm. Perpendicular to the Grain. II. In Compression

“…A comparison of some results for blackbutt between compression results (from this study) and tension results (from Alexiou et al 1991) in the tangential direction is shown in Table 11. Again, where values have been calculated using regression equations, a BD of 600 kg m' 3 has been used.…”

“…A strain rate of 0.0007/3 min. was used, similar to that used by Schaffner (1981) and Alexiou et al (1991). This strain rate allows some creep to occur during loading and better simulates the slow loading that occurs during drying than the rates used by previous workers.…”

Acoustic Emission Generated upon Mechano-Sorptive Creep of Wood Bent Across to the Grain under Asymmetrical Moistening

“…As indicated in this figure, AE is initiated when the total strain of the extreme layers of the bent wood sample increases up to 0.8 %. The deflection at which AE is initiated does not depend on the external bending load, it starts when the wood strain reaches the critical value determined in the static tension test (Alexiou et al 1991;Raczkowski et al 1995).…”