Phononic First Band Gap of Quaternary Layered Periodic Structure with the Lumped-Mass Method

Table 1

Material parameters.

Material code	Material name	Density; 𝜌 (kg·m^−3)	Elastic modulus; 𝐸 (Pa)	Poisson’s ratio; 𝜎	Thickness; 𝑑 (m)	Damping ratio; 𝜁
A	Silicone Rubber	1300	1.175𝑒5	0.4688	0.00125	0.1
C	Steel	7780	2.106𝑒11	0.3	0.00125	0
D	Tungsten	19100	3.54𝑒11	0.3505	0.00125	0