Free Vibration Analysis of DWCNTs Using CDM and Rayleigh-Schmidt Based on Nonlocal Euler-Bernoulli Beam Theory

Table 13

Fundamental frequency of vibration 𝜆₁ of DWCNTs with different boundary conditions between inner and outer tubes and for 𝜂₀[0.1−−0.5].

𝜂0	Cl-Fr inner; Cl-SS outer	Cl-Fr inner; Cl-Cl outer	Cl-Fr inner; SS-Sl outer	Cl-Fr inner; Cl-Sl outer
0	24.618	35.577	8.231	8.916
0.1	23.311	33.694	8.676	8.796
0.2	20.351	29.195	8.322	8.427
0.3	17.208	24.510	7.809	7.901
0.4	14.540	20.601	7.225	7.304
0.5	12.428	17.547	6.634	6.702