PSI - Issue 28

A. Saoud et al. / Procedia Structural Integrity 28 (2020) 491–501 Author name / Structural Integrity Procedia 00 (2019) 000–000

493

3

 High overall height and does not show deformations. A complete characterization of the material is then imperative. Physical and mechanical tests were performed, the results of which are grouped in Table 1 and Table 2, respectively:

Table 1: Physical Properties of Eucalyptus Grandis Wood d H g/cm³ d 0 g/cm³

d b g/cm³

R v (%)

R T (%)

R R (%)

A

Average Standard deviation

0.58 0.11

0.53 0.12

0.5

15.54

8.95 1.53

5.90 1.34

0.67 1.34

0.11

2.61

Examination of the experimental results shows that the density of Eucalyptus Grandis broadleaf species varies between 0.5 and 0.58 g/cm 3 , taking into account the classification of NFB51 005 in Table 2, this allowed us to conclude that the Eucalyptus Grandis is a light wood. It is also noted that Eucalyptus Grandis is characterized by a 15.54% volume reduction. By referring to NFB51-006 the value obtained from this withdrawal (15.54%), we qualify it as a high-shrinkage wood. Indeed, Our results are compatible with the results obtained by the authors Loulidi, Daya and the survey conducted by CIRAD on Eucalyptus Grandis.

Table 2: Mechanical properties of Eucalyptus Grandis wood

Young Longitudinal Module E l (MPa)

Axial bending stress σ fs (MPa)

Axial compression stress σ a (MPa)

Average

16800

49.03

121.5

Standard deviation

267

0.50

30

The petrol used has very important mechanical characteristics, which gives it a high rigidity.

2.2. Prototypes used We used a prototype test piece that we took care to improve to adapt it to the mode of fracture we want to study (mode II). To validate our design, we performed a microscopic analysis using a scanning electron microscope of the rupture facies to validate the mode of rupture and we performed the test most used the 4ENF.

Fig. 1. Representation of Mode II fracture test piece