Page 371 - Control Theory in Biomedical Engineering

Tunable stiffness using negative Poisson's ratio 337

Double arrow, PVA
Base case 3 mm elongation 6 mm elongation
7
6
5
Load (N) 4 3

2
1
0
–2 0 2 4 6 8 10
Vertical deflection (mm)
Double arrow, TPU

Base case 3 mm elongation 6 mm elongation
18
16
14
12
Load (N) 10 8 6

4
2
0
–2 0 2 4 6 8 10
Vertical deflection (mm)
Double arrow, Pythonflex

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)
Fig. 17 Test results for double arrow honeycomb structure.