Anomalous ultrasonic dispersion in fluid-coupled, fibrous composite plates

Chimenti, D. E.; Nayfeh, Adnan H.
September 1986
Applied Physics Letters;9/1/1986, Vol. 49 Issue 9, p492
Academic Journal
The ultrasonic dispersion characteristics of vertically polarized plate waves in fluid-coupled plates of unidirectional graphite-fiber reinforced epoxy have been found experimentally to display anomalous dispersion. This anomaly consists of a mixing of the two fundamental plate modes at phase velocities near the bulk composite transverse wavespeed. A calculation of ultrasonic reflection from a fluid-coupled composite plate accounts very well for the previously unreported experimental observations. It is demonstrated that the anomalous dispersion is a consequence of the presence of the fluid and is strongly enhanced by the highly anisotropic elastic nature of the composite. It is further shown that a much weaker manifestation of the effect also exists in fluid-coupled plates of elastically isotropic materials.


Related Articles

  • Effect of Ultrasound Treatment on Milk Homogenisation and Particle Size Distribution of Fat. Ertugay, M. Fatih; Sengül, Mustafa; Sengül, Memnune // Turkish Journal of Veterinary & Animal Sciences;2004, Vol. 28 Issue 2, p303 

    The effect of ultrasound treatment on milk homogenisation was studied. A microscope, equipped with a camera and ocular micrometer, was used to determine the diameters of fat globules and to evaluate the homogenisation efficiency of milk samples homogenised by using ultrasonic and conventional...

  • Measurement of Particle Size Distribution and Volume Concentration based on Ultrasonic Attenuation Spectrum in Fat Emulsion. Dong, Lili; Su, Mingxu; Xue, Minghua; Cai, Xiaoshu; Shang, Zhitao // AIP Conference Proceedings;2007, Vol. 914 Issue 1, p654 

    The determination of particle size distribution in concentrated polydisperse fat emulsions measured by ultrasonic attenuation spectrum is studied in this paper. Based on theoretical analysis, ultrasonic attenuation spectrum of fat emulsion samples containing different droplet concentrations...

  • Structural Modification of Strontium Hexaferrite Through Destruction Process and Ionic Substitution. Nur Fitriana, Karina; Hafizah, Mas Ayu Elita; Manaf, Azwar // AIP Conference Proceedings;2016, Vol. 1725 Issue 1, p020022-1 

    Synthesis of single phased SrO.6Fe2-xMnx/2Tix/2O3 (x = 0.0; 0.5; and 1.0) nanoparticles has been prepared through mechanical alloying, assisted with the ultrasonic destruction process. Monocrystalline particles were obtained when x = 0 treated with ultrasonic destruction at 55 μm of...

  • Inline high frequency ultrasonic particle sizer. Lefebvre, F.; Petit, J.; Nassar, G.; Debreyne, P.; Delaplace, G.; Nongaillard, B. // Review of Scientific Instruments;Jul2013, Vol. 84 Issue 7, p075101 

    This paper reports the development of a new method of particle sizing in a liquid. This method uses high frequency focused ultrasounds to detect particles crossing the focal zone of an ultrasonic sensor and to determine their size distribution by processing the reflected echoes. The major...

  • The Numerical Research of the Propagation of Ultrasound in the Pulverized Coal. Yongming Li; Mingxu Su; Yuan, Anli; Xiaoshu Cai // AIP Conference Proceedings;2014, Vol. 1592, p314 

    For the purpose of pulverized coal characterizations by ultrasonic method, the intensity attenuation and velocity changes of sound waves through the two-phase system of pulverized coal in air were predicted numerically by acoustic wave models. Meanwhile the analysis of the relationship between...

  • Investigations on Mechanical Properties of Friction Stir Processed, Nano-Reinforced, AA6061 Composites. Nandipati, Govind; Rao Damera, Nageswara; Nallu, Ramanaiah; Rao, K. Prasada // International Journal of Applied Engineering Research;2011, Vol. 6 Issue 1, p53 

    The Metal matrix composites (MMCs) are widely used in many industries. With the development of nano technology, particles size down to nano level enhances the properties of MMCs. The MMCs reinforced with nano size particulate are termed as Metal matrix nano composites (MMNCs). In this paper;...

  • PARTICLE CHARACTERIZATION: IT'S NOT ALL ABOUT SIZE.  // Lab Manager Magazine;Nov2011 Product Resource Guide, p34 

    The article focuses on the development of methods based on ultrasound and light scattering for use in sizing and characterizing smaller particles. It notes that the ability to characterize smaller particles is a direct response to discoveries in nanomaterials and nanotechnology. It mentions the...

  • Reducing Fat Globules Particle-Size in Goat Milk: Ultrasound and High Hydrostatic Pressures Approach. Karlović, S.; Bosiljkov, T.; Brnčić, M.; Semenski, D.; Dujmić, F.; Tripalo, B.; Ježek, D. // Chemical & Biochemical Engineering Quarterly;2014, Vol. 28 Issue 4, p499 

    Innovative and eco-friendly food technologies in practical usage today like Ultrasound (US) and High Hydrostatic Pressures (HHP) are feasible to adequately maintain various food properties while processed, such as texture, sensorial and organoleptic characteristics, and microbiological issues as...

  • Capacity spirals with new screen.  // Food Manufacture;Mar2005, Vol. 80 Issue 3, p47 

    This article presents information on the Vibrasonic Spiroscreen, the latest deblinding system from the inventor of ultrasonic mesh systems, Russell Finex Inc. The unit enables powders to be sieved on finer meshes with more accuracy--even on large diameter screens. The Spiroscreen uses a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics