막대형 시편의 종진동에 대한 동적모형 및 그 적용범위의 고찰

Investigation of Dynamic Models for Longitudinal Vibration of a Rod-Type Specimen and Their Useful Range

One of the most influential factors on estimating the complex modulus by using longitudinal vibration of a rod-type specimen is the accuracy of the approximate models for describing the dynamic behavior of the specimen. Performance of several approximate models is investigated analytically on the basis of the Pochhammer-Chree theory in case of infinite specimen and numerically on the basis of the finite element analysis in case of finite specimen. The frequency range where each model gives good approximation and its accuracy in that range are determined.