Propagation of longitudinal thermoplastic waves in layered structures

Li, Chen; Cetinkaya, Cetin
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1897
Academic Journal
The recent advances in photonics and laser instrumentation have been creating a favorable environment for thermal-based elastic wave generation techniques and their applications in various fields, such as nondestructive testing and smart structures. The main advantages of laser-based NDE include noncontact evaluation, freedom for complex surface geometry, high spatial and temporal resolution, easy access to cavities, and fast scanning. Two disadvantages are that the laser-based method requires a good physical understanding of thermoelastic wave propagation in solids, which is considerably more complicated than elastic wave propagation, and more complicated instrumentation needed for data collection. In an idealized solid, thermal energy is transported by two different mechanisms: by quantized electronic excitations, which are called free electrons, and the quanta of lattice vibrations, which are called phonons. These quanta undergo collisions of a dissipative nature, giving rise to thermal resistance in the medium. A relaxation time is associated with the average communication time between these collisions for the commencement of resistive flow. There are a number of optical methods available for elastic wave generation and detection. The most commonly utilized techniques include interferometric and noninterferometric techniques, optical heterodyning, differential interferometry, and time-delay interferometry. In the current work, a transfer matrix formulation including the second sound effect is developed for a thermoelastic layer. The second sound effect is included to eliminate the thermal wave travelling with infinite velocity as predicted by the diffusion heat transfer model, and, consequently, the immediate arrival of waves. Utilizing this formulation and the periodic systems framework, the attenuation and propagation properties of one-dimensional thermoelastic wave in both continuum and layered structures are studied. A perturbation analysis is carr...


Related Articles

  • Thermoelastic state of layered thermosensitive bodies of revolution for the quadratic dependence of the heat-conduction coefficients. Kushnir, R. M.; Protsyuk, Yu. B. // Materials Science;Jan2010, Vol. 46 Issue 1, p1 

    We propose an analytic-numerical method for the solution of one-dimensional static problems of thermoelasticity for layered cylinders and balls subjected to the action of the surface loads for various modes of heating with regard for the quadratic dependence of the heat-conduction coefficients...

  • Comparative study of flexural strength and elasticity modulus in two types of direct fiber-reinforced systems. Gaspar Junior, Alfredo de Aquino; Lopes, Manuela Wanderley Ferreira; Gaspar, Gabriela da Silveira; Braz, Rodivan // Brazilian Oral Research;Jul-Sep2009, Vol. 23 Issue 3, p236 

    The objective of this study was to compare the flexural strength and elasticity modulus of two types of staple reinforcement fibers, Interlig - Ângelus®/glass (Londrina, PR, Brazil) and Connect - KerrLab ®/polyethylene (MFG Co., West Collins Orange, CA, USA), which are widely used in...

  • Linear and nonlinear optical properties of layered structures in 1D. Bertolotti, M. // AIP Conference Proceedings;2001, Vol. 560 Issue 1, p1 

    An introduction of photonic band-gap structures is presented discussing the general properties of infinite 1-D systems. Finite systems are then considered together with their linear and nonlinear optical properties.

  • Theory of the strain-induced magnetic anisotropy of transition metal-noble metal multilayers. Yamaguchi, Akira; Ogu, Shinzo; Soe, We-Hyo; Yamamoto, Ryoichi // Applied Physics Letters;3/1/1993, Vol. 62 Issue 9, p1020 

    Examines the theory of the strain-induced magnetic anisotropy of transition metal-noble metal multilayers. Calculation for the magnetoelastic anisotropy energies; Characterization of the metal multilayers; Association between interfacial roughness and anisotropy.

  • Determination of the energy diagram of the dithioketopyrrolopyrrole/SnO[sub 2]:F heterojunction.... Moons, Ellen; Eschle, Martin // Applied Physics Letters;12/1/1997, Vol. 71 Issue 22, p3305 

    Measures the work functions of solid layers of dithioketopyrrolopyrrole by the Kelvin probe technique. Confirmation of p-conductivity type by the surface photovoltage (SPV) measurements; Distinction of two space-charge layers; Characterization of the SPV of thinner layers.

  • stratified.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p2216 

    A definition of the term "stratified," which means arranged in the form of layers, is presented.

  • stratiform.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p2216 

    A definition of the term "stratiform," which means arranged in layers, is presented.

  • stratify.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p2216 

    Definitions of the term "stratify,"are presented, including to arrange in layers.

  • stratum.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p2216 

    A definition of the term "stratum," which refers to a layer, is presented.


Read the Article


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

Try another library?
Sign out of this library

Other Topics