PSI - Issue 18

Andrea Spagnoli et al. / Procedia Structural Integrity 18 (2019) 775–780 Author name / Structural Integrity Procedia 00 (2019) 000–000

779

5

50

50

E p / E g =8

E p / E g =64

E p / E g =16

c =22 mm

c =32 mm

c =42 mm

40

40

10 Reaction force F [N] 20 30

10 Reaction force F [N] 20 30

D = c

D = c

0

0

0

0.5

1

1.5

2

0

0.5

1

1.5

2

Relative penetration D/c

Relative penetration D/c

(a)

(b)

0

0

c =22 mm

c = 32 mm

c = 42 mm

E p / E g =8

E p / E g =16

E p / E g =64

0.5

0.5

1.5 Relative penetration D/c 1

1.5 Relative penetration D/c 1

D = c

D = c

2

2

1.5

1

0.5

0

1

0.5

0

Relative deflection

Relative deflection

(c)

(d)

Fig. 2. Force-penetration curves of the bevel-tipped needle: (a) influence of the sti ff ness ratio E p / E g and (b) influence of the initial o ff set c . Tip deflection vs penetration curves: (c) influence of the sti ff ness ratio E p / E g and (d) influence of the initial o ff set c . In (a),(c) the o ff set is kept fixed at c = 32 mm , while in (b),(d) the sti ff ness ratio is maintained constant at E p / E g = 16.

References

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