So… is this a surface-breaking crack?
2006 (English)In: Journal of Mechanics of Materials and Structures, ISSN 1559-3959, Vol. 1, no 4, 743-762 p.Article in journal (Refereed) Published
An inspection technique used to assess the structural integrity of critical components in a nuclear power plant must be able to discern surface-breaking cracks from subsurface cracks. This work proposes an ultrasonic method to provide that information and presents a theoretical investigation into it. The main assumption of the model is that water carried by pressurized pipes infiltrates and fills a surface-breaking crack, while a subsurface crack is dry. The model simulates an inspection in which the modulation technique is employed and the surface hosting the crack is not accessible. A ratio, R, constructed with signals recorded in backscattering configuration during a modulation cycle, is examined and shown to provide a clear criterion allowing subsurface cracks to be distinguished from surface-breaking cracks when a shear vertical wave at 45 degree incidence is employed as a probe.
Place, publisher, year, edition, pages
2006. Vol. 1, no 4, 743-762 p.
partially closed cracks, modulation, wave scattering stress-corrosion
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-7890ISI: 000207728400008OAI: oai:DiVA.org:kth-7890DiVA: diva2:13053
QC 201009062008-01-142008-01-142010-12-17Bibliographically approved