Detecting water ingress in aviation honeycomb panels: Qualitative and quantitative aspects

Вавилов, В. П.; Маринетти, С.; Pan, Yuxiang; Чулков, А. О.

doi:10.1016/j.polymertesting.2016.07.023

Cited by 20 publications

(12 citation statements)

References 6 publications

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“…In [24], it is remark that for thermographic NDT inspection is difficult to discriminate, both theoretically and experimentally, between the presence of water and epoxy trapped in honeycomb cells, by analysing only the surface temperature patterns. It has been demonstrated that water trapped in honeycomb cells can be reliably detected by an increase in effusivity starting from the inflection time.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the freeze–thaw phenomenon in sandwich-structured composites via numerical simulations and infrared thermography

Сфарра

Tejedor

Perilli

et al. 2020

J Therm Anal Calorim

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The water ingress phenomenon in sandwich-structured composites used in the aerospace/aeronautical sector is a current issue. This type of defect can cause in the course of time several other defects at the boundary, such as corrosions, deformations, detachments, etc. In fact, water may change its state of physical matter going towards the freeze-thaw cycle caused by the atmosphere re-entry of, e.g., space probes. In this work, the alveoli of a composite laminate have been filled with water, which was initially transformed into ice. By taking into account the known quantity of water, the freeze-thaw cycle was simulated by Comsol Multiphysics ® software, reproducing exactly the shape of the sandwich as well as the real conditions in which it was subsequently subjected in a climatic chamber. The experimental part consisted of monitoring the front side of the specimen by means of a thermal camera operating into the longwave (LW) infrared spectrum, and by setting both the temperature and the relative humidity of the test chamber according to the values imposed during the numerical simulation step. It was found that the numerical and experimental temperature trends are in good agreement with each other since the model was built by following a physico-chemical point-of-view. It was also seen that the application of the independent component thermography (ICT) technique was able both to retrieve the positions of the defects (i.e., the water inclusions) and to characterize the defects in which a detachment (fabricated between the fibres and the resin) is present; the latter was realized above an inclusion caused by the water ingress. To the best of our knowledge, this is the first time that ICT is applied to satisfy this purpose.

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Section: Introductionmentioning

confidence: 99%

Evaluating the freeze–thaw phenomenon in sandwich-structured composites via numerical simulations and infrared thermography

Сфарра

Tejedor

Perilli

et al. 2020

J Therm Anal Calorim

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show abstract

“…Honeycomb sandwich structure used in aircraft structures is exposed to various kinds of loads during application, such as impact loading, concentrated loading, and vibration [9], [12]. In addition, composite honeycomb sandwich structure is often used in various environmental conditions during the operational use of the aircraft [2], [9], [11]. In certain conditions, the structure is exposed to fluids such as water, moisture, oil, or solvent [9].…”

Section: Introductionmentioning

confidence: 99%

“…Diffusion rates vary with the type of test samples [18]. Moisture absorption is a common behavior for composite materials [2], [3], [14], [19]. Compared to other structural materials, polymeric materials absorb more water, hydraulic fluid and solvents [9].…”

Section: Introductionmentioning

confidence: 99%

“…The use of composite sandwich structures has increased significantly. The main application of composite sandwich structure is in the aerospace industry because a high stiffness-to-weight ratio of a structure is one of the most critical factors during the aircraft design process [1][2][3][4][5][6][7]. An aircraft design requires the aircraft structure to resist various kinds of loads that are applied to the aircraft structure.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most effective ways to stiffen the structure and to resist a deforming force is to use a honeycomb sandwich structure [8]. For this reason, composite sandwich structure is used not only in primary structure of the aircraft, such as wings, fuselage, flaps, rudder, and fairings, but also for engine cowls, nacelles, radomes, floors, doors, and overhead storage bins [1,2,[9][10][11]. Besides the high strength-to-weight ratio, composite sandwich structure has many other advantages, such as corrosion resistance, design flexibility, fatigue resistance, and high temperature resistance [1,3,4,9,12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigating the effects aviation fluids have on the flatwise compressive strength of Nomex® honeycomb core material

Kım¹,

Sterkenburg²

2019

Jnl of Sandwich Structures & Materials

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One of the disadvantages of honeycomb sandwich structure is that they are prone to fluid intrusion. The purpose of this study is to determine if the structural properties of honeycomb core are affected by contact with a fluid. The test specimens were manufactured of fiberglass prepreg for the facesheets and Nomex ® honeycomb core for the core material in accordance with ASTM C-365/365M. Test specimens were soaked in several different kinds of fluids, such as aircraft fuel, turbine engine oil, hydraulic fluid, and water for a period of 60 days. A flatwise compressive test was performed, and the test results were analyzed to determine how the contact with aircraft fluids affected the compressive strength of the Nomex ® honeycomb core and how the strength was recovered when the specimens were dry. In addition, the investigation of de-bonding between facesheet and core material after soaking were performed to support the study.

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Applications of Thermal/Infrared NDT

Вавилов

Burleigh²

2020

Infrared Thermography and Thermal Nondestructive Testing

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Detecting water ingress in aviation honeycomb panels: Qualitative and quantitative aspects

Cited by 20 publications

References 6 publications

Evaluating the freeze–thaw phenomenon in sandwich-structured composites via numerical simulations and infrared thermography

Evaluating the freeze–thaw phenomenon in sandwich-structured composites via numerical simulations and infrared thermography

Investigating the effects aviation fluids have on the flatwise compressive strength of Nomex® honeycomb core material

Applications of Thermal/Infrared NDT

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