PSI - Issue 26

P. Nomikos et al. / Procedia Structural Integrity 26 (2020) 285–292 Nomikos et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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4.2. Numerical results Fig. 6 shows the uniaxial compressive strength of the BPMs with respect to the width of the numerical specimen. Blue and red markers represent the numerical UCS of the homogeneous BPMs with strong and weak band material properties respectively. It is observed that the homogeneous BPMs with strong band material properties exhibit a slight reduction in strength with increasing specimen ’s width . For the homogeneous BPMs with weak band material properties an almost constant UCS is observed irrespectively of the specimen ’s width . The numerical results clearly indicate that the UCS of the banded BPMs increases as the width of the numerical specimen increases. This is attributed to the reduction of the percentage of the weak band material within the specimen.

0 10 20 30 40 50 60 70 80

UCS (MPa)

25

50

75

100

125

150

175

200

D (mm)

Strong band specimens

Weak band specimens

Banded BPM

Fig. 6. Uniaxial compressive strength of the BPMs with respect to the specimen’s width.

In Fig. 7 the axial stress – axial strain diagrams obtained from the numerical UCS tests of the banded BPMs are shown. It is observed that the stiffness of the banded BPMs increases with increasing specimen ’s width . This is also attributed to the reduction of the percentage of the weak band material within the numerical specimen.

35

D=38 mm D=54 mm D=75 mm D=100 mm D=150 mm D=200 mm

30

25

20

15

10 Axial stress (MPa)

5

0

0.00

0.50

1.00

1.50

2.00

2.50

Axial strain (x10 -3 )

Fig. 7. Stress strain diagrams of the banded BPMs for the various BPM widths (diameters).

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