Patent ID: 8485033

Claim:
A method of determining the dynamic Poisson's ratio of a material, comprising: providing a circular solid rod specimen manufactured with the material to be determined for its dynamic Poisson's ratio and measuring a diameter D and a length L of the circular solid rod specimen; obtaining a fundamental longitudinal resonant frequency f l of the circular solid rod specimen; determining the circular solid rod specimen fundamental cross-sectional resonant frequency f d according to 0.87 ⁢ L D ⁢ f l ≤ f d ≤ 1.05 ⁢ L D ⁢ f l ; obtaining unitless rod specimen parameter κ according to κ = f d ⁢ D f l ⁢ L , and then obtaining the dynamic Poisson's ratio ν D according to v D = - 1.0477 + 1.1582 κ 2 ; justifying the validity of the dynamic Poisson's ratio ν D of the material, wherein if L D ≥ 25 ⁢ v D , then the Poisson's ratio ν D of the material is valid; and if L D < 25 ⁢ v D , then changing the ratio of the length L to the diameter D of the circular solid rod specimen to manufacture a new specimen, and repeating the said steps until the dynamic Poisson's ratio ν D of the material is valid.