• 제목/요약/키워드: 음탄성 정수

검색결과 1건 처리시간 0.014초

초음파 음속측정에 의한 응력평가에 관한 연구 (Stress Evaluation by Measuring Ultrasonic Velocity)

  • 이범성
    • 한국정밀공학회지
    • /
    • 제16권2호통권95호
    • /
    • pp.138-144
    • /
    • 1999

  • 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.

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