Numerical Calculation of Diffraction Coefficients in Anisotropic Media

Temple, J.A.G.; White, L.L.

doi:10.1007/978-1-4615-2848-7_5

Cited by 3 publications

(2 citation statements)

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“…This may be due to phase angles arbitrarily fluctuating between -71: and +71:. The same was also noticed by Temple and White [16].…”

Section: Cluster Analysis Of Phase As Variablesupporting

confidence: 76%

“…The technique clearly models the special behaviour of waves in orthotropic media, which can help in better planning of NDT experiments. Temple and White [16] also made a numerical approach to calculate diffraction coefficients in anisotropic media. In the present work an in-house developed automated ultrasonic scanning system has been used to obtain C-scan images based on the cluster analysis of frequency components of the received signal.…”

Section: Introductionmentioning

confidence: 99%

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Application of Multi Dimensional Cluster Analysis in Identification of Defects in Fibre Composites

Datia

Venkatesh

Kishore

1995

Nondestructive Testing and Evaluation

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Composite materials provide a serious challenge to the investigators as these materials may develop several types of damages during service such as delamination, voids, porosity, matrix cracking, fibre break etc., either individually or in combinations. Evaluation of exact type of damage quantitatively in composite materials is far more complicated than in the conventional homogenous materials which contain voids and cracks as primary defects. In the present investigation, a non-destructive testing is performed on impacted and artificial inclusion implanted laminates by an automated ultrasonic C-scanning system. Amplitude and phase of frequency components of the received ultrasonic signal have been used for showing images instead of conventionally used peak amplitude and time of flight. Cluster analysis has been employed to group the data units, either individuaJly or in combinations of them in a systematic way. The C-scan images show that the analysis of certain harmonics individually or taken together bring out valuable information about the damage in graphite-epoxy and in glass-epoxy laminates. This investigation strongly shows harmonics as valuable parameters for identification of damages and multi dimensional clustering technique as a powerful tool for effective classification.

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“…This may be due to phase angles arbitrarily fluctuating between -71: and +71:. The same was also noticed by Temple and White [16].…”

Section: Cluster Analysis Of Phase As Variablesupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%