초음파 음속측정에 의한 응력평가에 관한 연구

Stress Evaluation by Measuring Ultrasonic Velocity

Longitudinal wave and shear wave velocity changes of PMMA Polymer meterial under the the unidirection load were measured. The Third-order elastic modulus and acousto-elastic modulus of PMMA are obtained. The theoretical and experemental values of the velocity change of each wave by stress are compared each other and the validity of theoretical expression is examinated.