PSI - Issue 28

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

495

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Table 4: Dimensional characteristics of the test piece

Description

Dimensions (mm) accuracy of 0.1mm

Symbol

Width

15

2h

Thickness

10

B

The distance between the supports

200

2L 1

Notch length

(40; 50; 60; 70; 80; 90; 100)

a

Length

240

L 2

In order to increase the sharpness of the specimens we started them with a razor blade before each test, also to reduce the friction problem we placed two Teflon films between the lips of the notch. The test pieces were placed in a 4-point bending device with a static loading of 2mm/min. 3. Calculation of the toughness of solid wood in mode II using designed prototype All test pieces were taken from the logs of Eucalyptus Grandis wood as described above. The test pieces are notched along the longitudinal direction in the TL plane so that the rings are parallel in the TR plane. The travel speed of the test member shall be 0,5 mm/min. The test is interrupted when a sudden drop in load is observed. Fig 3 represent the typical displacement load curves of Eucalyptus Grandis for notch lengths of 4 mm and 12 mm.

Fig. 3. Load curve of Eucalyptus Grandis for a notch length a=4 mm and a=12 mm.