Comparison of Micro- and Standard-Size Specimens in Evaluating the Flexural Properties of Scots Pine Wood

Abstract

The aim of this study was to investigate the flexural properties (bending strength and modulus of elasticity) of Scots pine wood (Pinus sylvestris L.) using micro-and standard-size test specimens. In the standard-and micro-size specimens, the average bending strengths were evaluated as 72.8 and 62.4 MPa, and the bending modulus of elasticity was 9917 and 2884 MPa, respectively. These results showed that the bending strength and modulus of elasticity values of the micro-size specimens were lower than those of the standard-size specimens. The statistically significant effects included the specimen size, individual trees, and the interactions of the specimen size and trees on the bending strength and modulus of elasticity. Furthermore, regression analyses indicated a positive linear regression between the flexural properties of the micro-and standardsize specimens. The results indicated that micro-size specimens can be used to estimate the flexural properties of Scots pine wood when obtaining standard-size specimens is not possible.

Intra-Ring Properties of Earlywood and Latewood Sections of Sessile Oak (Quercus petraea) Wood

“…In this study, micro-size test samples were used to calculate the estimated values and standard-size test samples were used for the measured values. The previous studies showed that the micro-size test samples had the lower MOR and MOE values compared to standard-size samples (Deomano 2001;Büyüksarı et al 2016Büyüksarı et al , 2017b. Buyuksari et al (2017b) observed that the MOR and MOE values of the oak wood micro-size specimens were 40% and 75% lower than those of the standard-size specimens, respectively.…”

Is Wood a Material?

“…Figure 51 also shows that the size effect is more pronounced for tension as compared to compression. Micro-sized specimens are increasingly being used to minimize the amount of wood taken from a structure for testing [168]. But as we have been at pains to point out in this review, there are serious concerns with using small specimens (it will only work if the mechanical properties at two different size scales are well-correlated).…”

“…Figure 51. Comparison of the strengths of standard and micro-sized specimens of Pinus sylvestris in (a) tension (from[88]), (b) compression (from[88]) and (c) bending (from[168].…”

Effect of Loading Rate on Mechanical Properties of Micro-size Scots Pine Wood

“…The sample dimensions and loading rates have varied from one article to another. Micro-sized samples have been used to determine the mechanical properties of earlywood and latewood sections, wood strands, and fibers by several researchers (Plagemann et al 1984;Hunt et al 1989;Groom et al 2002;Mott et al 2002;Deomano and Zink-Sharp 2004;Zink-Sharp and Price 2006;Hindman and Lee 2007;Jeong et al 2009;Buyuksari et al 2016;Roszyk et al 2016).…”

“…Zink- Sharp and Price (2006) conducted the compression test with a loading speed of 0.029 mm/min. Buyuksari et al (2016) investigated the flexural properties of scots pine wood using both micro-and standard-size samples. They found that the bending strength and modulus of elasticity of the micro-size specimens were lower compared to those of the standard-size specimens.…”