PSI - Issue 5

Patrícia C. Raposo et al. / Procedia Structural Integrity 5 (2017) 1097–1101 Patrícia C. Raposo et al. / Structural Integrity P ocedia 00 (2017) 000 – 00

1099 3

= 100 × ℎ − (%)

(2)

2.1.2. Results The values of density, , obtained are presented in Table 1, being the mean value of 732.0 Kg/m 3 with an associated coefficient of variation (COV) of 1 %, showing the results between specimens are similar. The water content results are presented in Table 2, being the mean value of 9.05 % with a COV of 1.1 %, showing also the similarity of these results.

Table 1. Density results.

V × o 1 lu 0 me −6 (m 3 ) Humid mass × 10 −3 (Kg) 8.08 5.8223 7.68 5.6313

Dimensions (mm)

COV (%)

Density (Kg/m 3 )

Specimen

a

b

c

1 2 3 4

20.11 19.61 19.57 19.69

20.02 20.06 19.87 19.63

19.98 19.54 19.56 19.63

720.6 733.2 740.0 734.2 732.0

1.0

7.61 7.69

5.6313 5.6457

Mean

Table 2. Water content results.

Specimen

Humid mass (g)

Dry mass (g)

H (%)

COV (%)

1 2 3 4

5.8223 5.6313 5.6313 5.6457 Mean

5.3396 5.1581 5.1630 5.1842

9.04 9.17 9.07 8.90 9.05

1.1

2.2. Tensile strength test

2.2.1. Procedure and equipment The test to obtain the tensile strength parallel to the fibers, was done by applying tensile strength in the specimen until it reached the rupture, in a direction parallel to the fibers, in prismatic specimens with the dimensions of 5 × 20 × 200 3 (height x depth x length) as shows Fig. 2. The specimens were reinforced by gluing to the extremities "wafers" of Cambala wood, as tensile anchors, with 55 mm of length and 2 mm thick, using white glue (Fig. 2). Were tested six wood specimens, using an INSTRON 1125 equipment (Fig. 3) with a load cell of 100 kN, and subjecting each specimen to ten load and unload cycles, in a linear regime, with a velocity of 5 mm/min, to remove any buckling system clearances. In Fig. 4 is presented the aspect of the specimens before and after the test.

Fig. 2. Specimen dimensions (image from: [4]).

Fig. 3. Setup of the test (image from: [4]).