PSI - Issue 64
Agostino Walter Bruno et al. / Procedia Structural Integrity 64 (2024) 1411–1418 Bruno et al. / Structural Integrity Procedia 00 (2019) 000 – 000
1416
6
1.40
1.20
R f [MPa]
1.00
0.80
0.60
0.40
0.20
0.00
0.0% FIBRE
0.5% FIBRE
1.0% FIBRE
NAGEN
1.13 0.64
1.19 0.71
1.27 0.90
BOUISSET
Fig. 6. Bending strength of unreinforced and reinforced samples. The vertical bars represent the range between the min./max. values of strength.
Figure 7 shows the compressive strength R c [MPa] measured during the previously described tests (Figure 4b) for each earth-flax fibers composition. The compressive strength R c was elaborated following the provisions of EN 196 1 (2005) and is calculated as:
(2)
F A
R
=
c
c
c
where F c [N] is the compressive load at failure (peak) level, and A c is the area of the auxiliary plates (40×40 mm 2 ). Inspection of Figure 7 indicates that the compressive strength of Bouisset samples is highest when the fiber content is 0.5% and decreases when the fiber content is further increased to 1.0%. Conversely, the compressive strength of the Nagen samples monotonically increases as the flax fibers content grows larger. On average, fiber-reinforced Nagen samples exhibit a peak compressive strength of 5.20 MPa and 6.62 MPa with 0.5% and 1% flax fiber contents, respectively. Instead, at the same fiber contents, the Bouisset samples exhibit values of peak compressive strength of 4.68 MPa and 3.56 MPa, respectively. Finally, inspection of Figure 7 indicates that a relatively large dispersion characterizes the results from compression tests, which may be due to specimen damages during the previous 3-point bending tests.
6.00
5.00
R c [MPa]
4.00
3.00
2.00
1.00
0.00
0.0% FIBRE
0.5% FIBRE
1.0% FIBRE
NAGEN
2.81 2.96
5.20 4.69
5.62 3.56
BOUISSET
Fig.7. Compressive strengths of unreinforced and reinforced samples. The vertical bars represent the range between min./max. values of strength.
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