| Contrast enhancement of ultrasonic imaging of internal stresses in materials. | |
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MedLine Citation:
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PMID: 12159996 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The ultrasonic methods, which detect applied or residual stress in materials, are based on nonlinear interaction of a small dynamic disturbance (acoustic waves) with the pre-deformed state of the solid. This weak phenomenon (acoustoelasticity) leads to a dependence of acoustic wave velocities on the initial stress, and a stress-induced anisotropy in the acoustical properties of the material. In anisotropic media, the transversal wave velocity depends on its polarization. The amplitude of the conical polarized shear wave, propagating through a plate specimen, is sensitive to pre-stress due to acoustoelastic birefringence. The resulting scan image is created by variations of the amplitude. The previous description is a basic principle of the approach used for stress mapping in Al-alloys by time-resolved acoustic microscopy. Disk specimens with central stress concentrators are loaded step by step. The acoustic scans are created during each loading step. Thermal stress detection is also shown on specimens with an Invar core. The original image processing procedure has been developed to improve edge detection of obtained stress maps. The acoustic images are compared with theoretically predicted isocline contours. The inherent material anisotropy and the structural inhomogeneities influence significantly the acoustoelastic measurements. Advantages and limitations of the nondestructive technique are summarized on the basis of presented experimental results. |
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Authors:
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Michal Landa; Jirí Plesek |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Ultrasonics Volume: 40 ISSN: 0041-624X ISO Abbreviation: Ultrasonics Publication Date: 2002 May |
Date Detail:
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Created Date: 2002-08-05 Completed Date: 2002-08-23 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0050452 Medline TA: Ultrasonics Country: Netherlands |
Other Details:
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Languages: eng Pagination: 531-5 Citation Subset: - |
Affiliation:
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Institute of Thermomechanics, Czech Academy of Sciences, Praha, Czech Republic. ml@it.cas.cz |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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