Neutron imaging inspections of composite honeycomb adhesive bonds

Hungler, P.C.; Bennett, L. G. I.; Lewis, Wilfred; Schulz, Michael; Schillinger, B.

doi:10.1016/j.nima.2011.01.104

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…37 This software provides further correction to normalise for incident flux variation and beam profile correction. The reconstructed 3D image set was further analysed by VGStudioMax, 30 through rendering and porosity analysis. The image acquisition procedure is demonstrated in Figure 11.…”

Section: Image Acquisition -Neutron Imagingmentioning

confidence: 99%

“…In this study, Martin measured and calculated neutron radiographic film densities as a function of resin content within AE1 wt.%. Since neutron imaging has a superior advantage over the other NDI techniques for moisture detection, 29 Hungler et al 30 have utilized neutron imaging to investigate the integrity of structural bonds in honeycomb composite panels. Since the adhesive in the bond will be degraded due to prolonged exposure to moisture, neutron imaging is able to predict where the partial bonds are located, which corresponds to areas of moisturized adhesive.…”

Section: Introductionmentioning

confidence: 99%

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Porosity analysis of carbon fibre-reinforced polymer laminates manufactured using automated fibre placement

Oromiehie

Garbe

Prusty

2019

Journal of Composite Materials

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Automated fibre placement-based manufacturing technology is increasingly being used in several engineering applications. Manufacture of carbon fibre-reinforced plastic’s small/large structures have been made possible due to its remarkable capabilities like productivity and accuracy. Nevertheless, making high-quality composite laminate using automated fibre placement relies on the proper selection of critical processing variables to avoid internal flaws during the fibre placement process. Consequently, a reliable non-destructive inspection technique is required for quality assurance and structural integrity of fabricated laminates. Neutron radiography/tomography offers unique imaging capabilities over a wide range of applications including fibre-reinforced polymer composites. The application of this technique towards tomographic reconstruction of automated fibre placement-made thermoplastic composites is presented in this paper. It is shown that the porosity analysis using neutron imaging technique provides reliable information. Additionally, using such technique valuable data regarding the size and the location of the voids in the laminate can be acquired and informed. This will assist the composite structural analysts and designers to select the appropriate processing parameters towards a defect free automated fibre placement part manufacture.

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Section: Image Acquisition -Neutron Imagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Porosity analysis of carbon fibre-reinforced polymer laminates manufactured using automated fibre placement

Oromiehie

Garbe

Prusty

2019

Journal of Composite Materials

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“…Even when there is no damage to the skin panel, moisture can diffuse through porosity and micro-cracks that are induced from thermal cycles [7], [15], [16]. When moisture ingresses into a honeycomb structure, the pattern of the infiltration is very random and unpredictable [17]. The speed of moisture infiltration through the honeycomb is very slow.…”

Section: Introductionmentioning

confidence: 99%

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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Inspection Methods

2018

Composite Structures

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Neutron imaging inspections of composite honeycomb adhesive bonds

Cited by 9 publications

References 5 publications

Porosity analysis of carbon fibre-reinforced polymer laminates manufactured using automated fibre placement

Porosity analysis of carbon fibre-reinforced polymer laminates manufactured using automated fibre placement

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

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