Page 369 - Control Theory in Biomedical Engineering

Tunable stiffness using negative Poisson's ratio 335

Missing rib, PVA

Base case 3 mm elongation 6 mm elongation
9
8
7
6
Load (N) 5 4 3

2
1
0
–2 –1 0 2 4 6 8 10
Vertical deflection (mm)

Missing rib, TPU
Base case 3 mm elongation 6 mm elongation
14
12
10 8
Load (N) 6

4
2
0
0 2 4 6 8 10
–2
Vertical deflection (mm)
Missing rib, Pythonflex
Base case 3 mm elongation 6 mm elongation
12
10
8
Load (N) 6 4

2
0
–2 0 2 4 6 8 10
–2
Vertical deflection (mm)
Fig. 16 Test results for missing rib structures.