Modelling, detecting and evaluating water ingress in aviation honeycomb panels

Вавилов, В. П.; Pan, Yuxiang; Moskovchenko, Alexey; Čapka, Alexander

doi:10.1080/17686733.2017.1317443

Cited by 4 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This process is referred to as the "concept of apparent effusivity". Similar researches supported with numerical results have been conducted in [25][26]. In particular, the authors focused the attention on the thickness of the water layer affecting the surface temperature anomalies and times of their appearance in active one-sided thermal tests.…”

Section: Introductionsupporting

confidence: 52%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionsupporting

confidence: 52%

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

View full text Add to dashboard Cite

show abstract

“…The image sequence may be analyzed in the time domain or in the frequency domain. Since it is more difficult to detect inclusions in large-sized and massive members, they are less often investigated using this method [20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48]. No experiment in which the time of recording thermograms is considerably extended until a thermal equilibrium between the tested element and the environment is reached.…”

Section: Introductionmentioning

confidence: 99%

Inverse Contrast in Non-Destructive Materials Research by Using Active Thermography

Noszczyk

Nowak

2019

Materials

View full text Add to dashboard Cite

Background: it is undesirable for defects to occur in building partitions and units. There is a need to develop and improve research techniques for locating such defects, especially non-destructive techniques for active thermography. The aim of the experiment was to explore the possibility of using active thermography for testing large-sized building units (with high heat capacity) in order to locate material inclusions. Methods: as part of the experiment, two building partition models—one made of gypsum board (GB) and another made of oriented strand board (OSB)—were built. Three material inclusions (styrofoam, granite, and steel), considerably differing in their thermal parameters, were placed in each of the partitions. A 7.2 kW infrared radiator was used for thermally exciting (heating) the investigated element for 30 min. The distribution of the temperature field was studied on both sides of the partition for a few hours. Results: using the proposed investigative method, one can detect defects in building partitions under at least 22 mm of thick cladding. At a later cooling down phase, inverse temperature contrasts were found to occur—the defects, which at the beginning of cooling down were visible as warmer areas, at a later phase of cooling down are perceived as cooler areas, and vice versa (on the same front surface). In the transmission mode, the defects are always visible as areas warmer than defect-free areas. Moreover, a quantitative (defect location depth) analysis with an accuracy of up to 10% was carried out using the Echo Defect Shape method. Conclusions: active thermography can be used in construction for non-destructive materials testing. When the recording of thermograms is conducted for an appropriate length of time, inverse contrasts can be observed (on the same front surface).

show abstract

Computational Fluid Dynamics Analysis of Moisture Ingress in Aircraft Structural Composite Materials

et al. 2019

View full text Add to dashboard Cite

Modelling, detecting and evaluating water ingress in aviation honeycomb panels

Cited by 4 publications

References 7 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

Inverse Contrast in Non-Destructive Materials Research by Using Active Thermography

Computational Fluid Dynamics Analysis of Moisture Ingress in Aircraft Structural Composite Materials

Contact Info

Product

Resources

About