G [GPa]

D_w [mm]

D_m [mm]

N_a

k (N/m)

Stiffness spring (k_st)

14 Martensite

0.3

2.6

10

85

40 Austenite

250

Elongation spring (k_El)

20 Martensite

0.8

4

7

2500

40 Austenite

4571