Table 1.

Structure and Material Parameters of the Bellow Chamber

Structure parameters
Outer diameter (mm)	D
Inner diameter (mm)	d
Initial length of one convolution (mm)	h0
Initial outer diameter (mm)	D0
Outer diameter/inner diameter ratio	$\alpha =D∕d$
Wall thickness (mm)	t
Number of convolutions	N

Material parameters (low-density polyethylene)
Modulus of elasticity $E$ (MPa)	172
Poisson's ratio $\mu$	0.439