Elastic Waves in Solids

Pao, Yih‐Hsing

doi:10.1115/1.3167197

Cited by 102 publications

(32 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mandal and Toksoz (1990) developed an algorithm for generating complete waveforms in general anisotropic media and computed complete wavefields therein due to a point source. A report related to wave motion in anisotropic media has also been reviewed by Crampin (1981) and Pao (1983).…”

Section: Introductionmentioning

confidence: 99%

Reflection and Refraction of SH-Waves at a Corrugated Interface between Two-Dimensional Transversely Isotropic Half-Spaces.

Tomar

Saini

1997

J,Phys,Earth

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Reflection and Refraction of SH-Waves at a Corrugated Interface between Two-Dimensional Transversely Isotropic Half-Spaces.

Tomar

Saini

1997

J,Phys,Earth

View full text Add to dashboard Cite

show abstract

“…Acoustic wave interactions with solids depend on mechanical properties of the material (Pao 1983) such as density and elastic constants (Krautkrämer and Krautkrämer 1990). In solids, these waves are also referred to as elastic or stress waves.…”

Section: Ultrasonic Measurements Of Sound Speed and Attenuationmentioning

confidence: 99%

Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants ? Interim Study FY13

Simmons¹,

Fifield²,

Westman³

et al. 2013

View full text Add to dashboard Cite

Executive SummaryThe motivation for this study stems from the need to address the aging management of incontainment cables at nuclear power plants (NPPs). The most important criterion for cable performance is its ability to withstand a design-basis accident. With nearly 1000 km of power, control, instrumentation, and other cables typically found in a NPP, it would be a significant undertaking to inspect all of the cables. Degradation of the cable jacket, electrical insulation, and other cable components is a key issue that is likely to affect the ability of the currently installed cables to operate safely and reliably for another 20 to 40 years beyond the initial operating life. The development of one or more nondestructive evaluation (NDE) techniques and supporting models that could assist in determining the remaining life expectancy of cables or their current degradation state would be of significant interest. The ability to nondestructively determine material and electrical properties of cable jackets and insulation without disturbing the cables or connections has been deemed essential.Currently, the only technique accepted by industry to measure cable elasticity (the gold standard for determining cable insulation degradation) is the indentation measurement. All other NDE techniques are used to find flaws in the cable and do not provide information to determine the current health or life expectancy.There is no single NDE technique that can satisfy all of the requirements needed for making a lifeexpectancy determination, but a wide range of methods have been evaluated for use in NPPs as part of a continuous evaluation program. The commonly used methods are indentation and visual inspection, but these are only suitable for easily accessible cables. Several NDE methodologies using electrical techniques are in use today for flaw detection but there are none that can predict the life of a cable.There are, however, several physical and chemical property changes in cable insulation as a result of thermal and radiation damage. In principle, these properties may be targets for advanced NDE methods to provide early warning of aging and degradation. Examples of such key indicators include changes in chemical structure, mechanical modulus, and dielectric permittivity. While some of these indicators are the basis of currently used technologies, there is a need to increase the volume of cable that may be inspected with a single measurement, and if possible, to develop techniques for in-situ inspection (i.e., while the cable is in operation). This is the focus of the present report.Several approaches to nondestructively measuring key indicators of cable aging and degradation may be available, and could include chemical, mechanical, and electrical measurements. Electrical and acoustic measurements are potential alternative NDE approaches that may be capable of providing in-situ assessments of cable condition and remaining useful life.Measurement studies were conducted with samples of aged ethylene propylene rubber (EPR) cabl...

show abstract

“…Multiple scattering problems occur in many applications related to various areas of applied science, e.g., acoustics [1,2], electromagnetism [3,4], elasticity [5], and water-wave [6] problems. Mathematically speaking, the scattering field appears as the superposition of free field and radiation field.…”

Section: Introductionmentioning

confidence: 99%

Scattering of sound from point sources by multiple circular cylinders using addition theorem and superposition technique

Chen

Lee

Lin

et al. 2011

Numer. Methods Partial Differential Eq.

View full text Add to dashboard Cite

In this study, we use the addition theorem and superposition technique to solve the scattering problem with multiple circular cylinders arising from point sound sources. Using the superposition technique, the problem can be decomposed into two individual parts. One is the free-space fundamental solution. The other is a typical boundary value problem (BVP) with specified boundary conditions derived from the addition theorem by translating the fundamental solution. Following the success of null-field boundary integral formulation to solve the typical BVP of the Helmholtz equation with Fourier densities, the second-part solution is easily obtained after collocating the observation point exactly on the real boundary and matching the boundary condition. The total solution is obtained by superimposing the two parts which are the fundamental solution and the semianalytical solution of the Helmholtz problem. An example was demonstrated to validate the present approach. The parameter study of size and spacing between cylinders are addressed. The results are well compared with the available theoretical solutions and experimental data.

show abstract

Elastic Waves in Solids

Cited by 102 publications

References 88 publications

Reflection and Refraction of SH-Waves at a Corrugated Interface between Two-Dimensional Transversely Isotropic Half-Spaces.

Reflection and Refraction of SH-Waves at a Corrugated Interface between Two-Dimensional Transversely Isotropic Half-Spaces.

Determining Remaining Useful Life of Aging Cables in Nuclear Power Plants ? Interim Study FY13

Scattering of sound from point sources by multiple circular cylinders using addition theorem and superposition technique

Contact Info

Product

Resources

About