Ultrasonic Inspection of Composites

Tittmann, Bernhard R.

doi:10.1016/b0-08-042993-9/00201-1

Cited by 9 publications

(5 citation statements)

References 61 publications

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“…Echoes with high amplitude at the same TOF are monitored, but the shape of the resulting area is not geometrically specific. The above results verify the difficulty in detecting the shape and size of defects in glass reinforced composite thick laminates, as it is also reported in the literature [8] and [9].…”

Section: Gfrp Specimenssupporting

confidence: 89%

“…Their inspection was aiming only at locating the depth position of the defects and not their size, whereas they report that difficulties were met in the inspection of GFRP materials. [9] on the other hand, proposed guidelines for the ultrasonic inspection of composite materials, in an effort to estimate the size of the defects in materials of this type. The same authors concluded also that the sizing of the defects is not efficient, especially in multi layered materials with large thickness.…”

Section: Application Of Ultrasonic C-scan Techniques For Tracing Defementioning

confidence: 99%

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Application of Ultrasonic C-Scan Techniques for Tracing Defects in Laminated Composite Materials

Hasiotis¹,

Badogiannis²,

Tsouvalis³

2011

SV-JME

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In this paper practical ultrasonic C-scan techniques for NDT of laminated composite materials are developed and applied, with an aim to trace specific artificial defects. Two types of materials are examined; an advanced carbon/epoxy system and a typical marine type glass/polyester system. Both were constructed with two manufacturing methods (Hand Lay-Up and Vacuum Infusion). Several artificial defects were embedded into the test plates, varying in shape, magnitude and through thickness position. Test plates were C-scanned using ULTRAPAC II ultrasonic system with ULTRAWIN software and typical examination techniques (layer to layer examination, full width examination, etc.) were used to determine and characterize defects. In addition, appropriate software tuning procedures and examination strategies were applied, which further developed and optimised tthe scanning procedure. These efforts resulted in effective C-scan images, allowing the determination of the position and even the shape of the defects in some cases. Finally, precise determination of specimens' thickness was achieved.

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Section: Gfrp Specimenssupporting

confidence: 89%

Section: Application Of Ultrasonic C-scan Techniques For Tracing Defementioning

confidence: 99%

Application of Ultrasonic C-Scan Techniques for Tracing Defects in Laminated Composite Materials

Hasiotis¹,

Badogiannis²,

Tsouvalis³

2011

SV-JME

View full text Add to dashboard Cite

show abstract

“…This causes an elongation effect in the longitudinal direction of the defect signal, with the elongation length being equivalent to the diameter of the probe. Second, when the orientation of a defect is not perpendicular to the sound wave propagation direction, the echo signals from the defects may not effectively return to the probe, leading to a loss of signal [6]. As a result, the 3D reconstructed images exhibit significant inaccuracies in representing the lateral dimensions of the defect shapes.…”

Section: Results and Discussion 3-1 Contact-based Testingmentioning

confidence: 99%

Silicone sealant defect detection via 3D image reconstruction from multiple ultrasonic sensors

Chung,

Sfarra,

Yao

2024

NDE 4.0, Predictive Maintenance, Communication, and Energy Systems: The Digital Transformation of NDE II

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In the production and packaging of silicone sealants, entrapped air, impurities, and foreign particles can introduce defects affecting performance. This study utilizes three ultrasonic non-destructive testing techniques: contact-based, angle-beam, and through-transmission testing, to identify defects and generate 3D images. The scanning process takes vertical A-scan measurements across the sample and rotates it at predetermined angles for comprehensive coverage. The contact-based technique uses the time-of-flight principle to determine defect locations, but struggles with defects aligned perpendicular and experiences signal reduction. The angle-beam method identifies defects in areas previously out of reach, but the slow sound movement in sealants can hinder capturing specific signals. While through-transmission offers enhanced signal clarity and an improved signal-to-noise ratio, pinpointing the defect's exact depth is challenging. By combining these methods, the study reconstructs a more accurate three-dimensional image which visualizes the defective region.

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“…The open pore porosity was about 20%, the density about 1.32 gm/cm 3 , and the permeability about 1 millidarcy. The elastic stiffness constants as determined from anisotropic wave velocity measurements were discussed elsewhere [17,18] as preliminary results. Fig.…”

Section: Description Of Samples and Apparatusmentioning

confidence: 99%

Acoustic emission technique for monitoring the pyrolysis of composites for process control

Tittmann

Yen

2008

Ultrasonics

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Ultrasonic Inspection of Composites

Cited by 9 publications

References 61 publications

Application of Ultrasonic C-Scan Techniques for Tracing Defects in Laminated Composite Materials

Application of Ultrasonic C-Scan Techniques for Tracing Defects in Laminated Composite Materials

Silicone sealant defect detection via 3D image reconstruction from multiple ultrasonic sensors

Acoustic emission technique for monitoring the pyrolysis of composites for process control

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