Table 2: Numerical comparison among [33, 34] and CDM of clamped-free DWCNTs: in columns 3 and 5 the first two dimensionless fundamental frequencies and , with , are reported, while in column 4 the first frequency , with  TPa, is listed.

Method

0[34]3.6645.8506.692
[33]3.5166.422
CDM3.5165.6146.421

0.1[34]3.5685.6976.517
[33]3.5316.449
CDM3.5315.6386.448

0.2[34]3.3205.3026.064
[33]3.5796.537
CDM3.5705.7026.520

0.3[34]3.0024.7935.483
[33]3.6696.700
CDM3.6155.7726.602