(Investigations of ultrasonic wave interactions with grain boundaries and grain imperfections)
The main objective of our research is to obtain a better understanding of ultrasonic wave interaction with interfaces in polycrystalline materials. This report discusses two recently developed experimental techniques: scanning acoustic microscope and optical point sensors. As for general wave propagation problems in anisotropic media, four major topics are discussed in separate sections. First, single boundaries between large bicrystals are considered. The reflection and transmission coefficients of such interfaces are calculated for imperfect boundary conditions by using the finite interface stiffness approach. Ultrasonic transmission through multiple-grain structures are investigated by computer simulation based on the statistical evaluation of repeated acoustical wave interactions with individual grain boundaries. The number of grains interacting with the propagating acoustical wave is considered to be high enough to approximate the wave-material interaction as scattering on elastic inhomogeneities. The grain scattering induced attenuation of Rayleigh waves is investigated in polycrystalline materials. 41 refs., 43 figs.
- Research Organization:
- Ohio State Univ. Research Foundation, Columbus, OH (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-84ER45057
- OSTI ID:
- 6390166
- Report Number(s):
- DOE/ER/45057-6; ON: DE91002695
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
ALUMINIUM
NONDESTRUCTIVE ANALYSIS
GRAIN BOUNDARIES
WAVE PROPAGATION
POLYCRYSTALS
STAINLESS STEELS
ULTRASONIC WAVES
COMPUTERIZED SIMULATION
DEFECTS
INCIDENCE ANGLE
INTERFACES
PROGRESS REPORT
RAYLEIGH WAVES
REFRACTION
TITANIUM
WELDED JOINTS
ALLOYS
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
CRYSTALS
DOCUMENT TYPES
ELEMENTS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
METALS
MICROSTRUCTURE
SEISMIC SURFACE WAVES
SEISMIC WAVES
SIMULATION
SOUND WAVES
STEELS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties
420500 - Engineering- Materials Testing