Determination of Young’s modulus and internal friction coefficient from flexural wave in thin bars

作者：Qiushuang Guo, David A. Brown · 发表于：The Journal of the Acoustical Society of America · 年份：1999 · DOI：10.1121/1.426391 · 被引用次数：1 · 研究领域：Adhesion, Friction, and Surface Interactions、Vibration and Dynamic Analysis、Dynamics and Control of Mechanical Systems

The flexural wave equation including internal friction and the correction due to rotatory inertia and shear deflection for thin bars is solved. The system response of the forced-free bar excited in flexural vibrations is obtained. Corrections for rotatory inertia and shear deflection have to be included for a best fit. The numerical factor representing the correction effect of shear deflection is smaller than previous results which means that shear deflection has a greater correction contribution than previously thought. At low-frequency range, the Young’s modulus obtained from flexural modes is different from that from longitudinal modes. This may suggest that more correction effects need to be included for the flexural system. [Work supported by the Ph.D. Program and the Strategic Environtechnology Partnership (STEP) through the Advanced Technology Center at the University of Massachusetts Dartmouth.]