Discriminating surface-breaking from subsurface cracks in pressurized water pipes by means of a parametric modulation technique

Poznić, Milan; Pecorari, Claudio

doi:10.1016/j.ndteint.2007.09.005

Cited by 1 publication

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years there has been significant research into nonlinear acoustic effects in solids and a range of promising applications have been investigated in the field of nondestructive testing (NDT) [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. There are two key strands to this research; material nonlinearity measurement and localized defect nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

“…A common NDT technique for the measurement of nonlinearity is to modulate the sample through some low-frequency (or quasi-static) mechanism such as temperature [12], or either static [13], impact [14,15] or sinusoidal forcing [16][17][18][19][20][21][22]. In all cases, high-frequency measurements (either using bulk waves or surface waves) were also made at various points throughout the modulated loading cycle.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-frequency vibration modulation of guided waves to image nonlinear scatterers for structural health monitoring

Jiao¹,

Drinkwater²,

Neild³

et al. 2009

Smart Mater. Struct.

View full text Add to dashboard Cite

Guided wave structural health monitoring offers the prospect of continuous interrogation of large plate-like structures with a sparse network of permanently attached sensors. Currently, the most common approach is to monitor changes in the received signals by subtraction from a reference signal obtained when the structure was known to be defect-free. In this paper a comparison is made between this defect-free subtraction approach and a technique in which low-frequency vibration modulation of guided wave signals is used to detect nonlinear scatterers. The modulation technique potentially overcomes the need for the defect-free reference measurement as the subtraction is now made between different parts of an externally applied low-frequency vibration. Linear defects were simulated by masses bonded onto a plate and nonlinear scatterers were simulated by loading a similar mass against the plate. The experimental results show that the defect-free subtraction technique performs well in detecting the bonded mass whereas the modulation technique is able to discriminate between the bonded and loaded masses. Furthermore, because the modulation technique does not require a defect-free reference, it is shown to be relatively independent of temperature effects, a significant problem for reference based subtraction techniques.

show abstract