Lamb Wave Propagation in Thermally Damaged Composites

Seale, Michael D.; Smith, Barry T.

doi:10.1007/978-1-4613-0383-1_33

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…During thermal cycling, thermal stresses appear in the composite laminates due to the difference in the coefficient of thermal expansion (CTE) between the fibers and the matrix [ 34 ]. These cyclic thermal stresses may induce transverse matrix cracks, debonding and delaminations [ 35 ]. The matrix cracks induced by cyclic thermal stress offer to the process of oxidation many access paths towards the interior of the material.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Degradation Progressive in Composite Laminates Subjected to Thermal Fatigue and Moisture Diffusion by Lamb Waves

Cho

2016

Sensors

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Laminate composites which are widely used in the aeronautical industry, are usually subjected to frequency variation of environmental temperature and excessive humidity in the in-service environment. The thermal fatigue and moisture absorption in composites may induce material degradation. There is a demand to investigate the coupling damages mechanism and characterize the degradation evolution of composite laminates for the particular application. In this paper, the degradation evolution in unidirectional carbon/epoxy composite laminates subjected to thermal fatigue and moisture absorption is characterized by Lamb waves. The decrease rate of Lamb wave velocity is used to track the degradation evolution in the specimens. The results show that there are two stages for the progressive degradation of composites under the coupling effect of thermal cyclic loading and moisture diffusion. The present work provides an alternative to monitoring the degradation evolution of in-service aircraft composite Laminates.

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Section: Resultsmentioning

confidence: 99%

Characterization of Degradation Progressive in Composite Laminates Subjected to Thermal Fatigue and Moisture Diffusion by Lamb Waves

Cho

2016

Sensors

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“…The experimental setup for ultrasonic Lamb In the thermal fatigue process, thermal stress is generated the transverse matrix cracks and delamination in the composite laminates [13,14].…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Using Lamb Waves to Monitor Moisture Absorption in Thermally Fatigued Composite Laminates

Lee¹,

Cho²

2016

Journal of the Korean Society for Nondestructive Testing

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“…However the structure complicates the residual signal. There once again laser generated ultrasound might be convenient as well as pulsed thermography or shearography for larger defects [9][10][11]. Along with the new materials bonding technologies were adapted like adhesive bonding.…”

Section: Defects Detectable With Ondtmentioning

confidence: 99%

Novel trends in optical non-destructive testing methods

Huke

Klattenhoff

Kopylow

et al. 2013

J. Eur. Opt. Soc.-Rapid Publ.

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Non-destructive testing (NDT) describes a wide range of methods for measuring and comparing physical quantities against a nominal condition. In this paper we describe and compare different optical NdT (ONDT)-methods with respect to their characteristics and capability for different measurement tasks. ONDT may be specified in two categories, passive and active. The NDT principles of the first category just use a measurement method like view inspection, elipsometry or reflectometry to detect defects which are easily accessible. The principles of the second category use an excitation force, such as heat or mechanical vibration introduced by transducers to detect hidden defects. This category can be specified into two subcategories. The first subcategory "time-/depth-resolved" includes measurement methods delivering detailed information of the geometric features of a hidden defect. Therefore the excitation of the material and the detection of the reaction have to provide a time step which enables depth-solved measurements. Phase-resolved thermography and laser ultrasound are examples for this category. The second subcategory "Integrating" includes measurement technique coupled with an excitation that enables detection of defects but not evaluation of their geometric features. Examples for these measurement techniques are shearography, reflectometry, vibrometry and thermography coupled with excitation method like simple heating or loading with a constant force. We demonstrate experimental results obtained using methods developed in our institute and highlight directions of further development.

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Lamb Wave Propagation in Thermally Damaged Composites

Cited by 4 publications

References 2 publications

Characterization of Degradation Progressive in Composite Laminates Subjected to Thermal Fatigue and Moisture Diffusion by Lamb Waves

Characterization of Degradation Progressive in Composite Laminates Subjected to Thermal Fatigue and Moisture Diffusion by Lamb Waves

Using Lamb Waves to Monitor Moisture Absorption in Thermally Fatigued Composite Laminates

Novel trends in optical non-destructive testing methods

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