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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