The structural environment as a factor affecting coating failure in aircraft joints

Tiong, Ung Hing; Clark, Graham

doi:10.1016/j.proeng.2010.03.151

Cited by 11 publications

(12 citation statements)

References 17 publications

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“…High performance aircraft are subjected to harsh environmental factors during operation including impacts with water and other particles, as well as high temperature and humidity [1]. Rain erosion coatings (REC), made from polyurethane (PU), are used to protect the metal surfaces and other underlying coatings from these damaging elements by absorbing the force of impacts and providing a barrier against corrosive substances.…”

Section: Aircraft Coating Service Lifementioning

confidence: 99%

“…Over time these coatings break down and may fail in flight by delamination. Failure of a coating leads to unplanned downtime and expensive refinishing procedures [1]. Coatings that are exposed to high temperature and humidity are particularly susceptible to degradation [1], leading to the assumption that the cause is hydrolysis or pyrolysis.…”

Section: Aircraft Coating Service Lifementioning

confidence: 99%

“…These types of decomposition lead to a breakdown of the polymer network structure and reduce both the tensile strength and glass transition temperature of the coating, increasing the likelihood of failure [1].…”

Section: Aircraft Coating Service Lifementioning

confidence: 99%

“…Polyether based PUs have better thermal and hydrolysis resistance whereas polyester based PUs have better chemical resistance [17]. The latter is chosen in most REC applications to prevent deicers and hydraulic fluids from degrading the polymer [1]. The choice of an aliphatic over an aromatic diisocyanate is to avoid toxic monomer components and degradation byproducts [18].…”

Section: Scanning Kelvin Probementioning

confidence: 99%

“…Substantial decrease in intensity in the vibration band 1300-1100cm -1 is indicative of loss of ester bonds, which are part of the main polymer chain [16]. Hydrolysis occurs most rapidly on esters so an intensity decrease in these bands is expected with increasing exposure to heat and humidity [1]. Along the entire spectrum (Figure 45), this region has the most significant intensity change so it is likely the primary result of decomposition.…”

Section: Raman Comparisonmentioning

confidence: 99%

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Nondestructive Evaluation of Urethane-Ester Coating Systems Using the Scanning Kelvin Probe Technique

Borth

Iezzi

Dudis³

et al. 2019

CORROSION

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The research described herein examines the effect of hydrolytic decomposition on the work function of polyurethane rain erosion coatings (REC). Two groups of panels, one group coated with REC containing carbon black and one group coated in REC without carbon black, were exposed to high temperature and humidity conditions in a steam autoclave for various periods of time. The work function of each unique exposure time was measured with a scanning Kelvin probe (SKP) and compared to unexposed coated panels to determine the magnitude of change in the REC coating. For both sample groups, results from the SKP analysis showed that as the coated panels were exposed for longer periods of time, the work function increased compared to an identical panel that was not exposed. The extent of the polymer coating degradation was determined by Raman spectroscopy and thermomechanical analysis (TMA). v ACKNOWLEDGMENTS This work would not have been possible without the generous contributions of these people.  Dr. Douglas C. Hansen: For hosting the research in his lab as well as providing help and experience at all levels of the project.

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Section: Aircraft Coating Service Lifementioning

confidence: 99%

Section: Aircraft Coating Service Lifementioning

confidence: 99%

Section: Aircraft Coating Service Lifementioning

confidence: 99%

Section: Scanning Kelvin Probementioning

confidence: 99%

Section: Raman Comparisonmentioning

confidence: 99%

See 3 more Smart Citations

Nondestructive Evaluation of Urethane-Ester Coating Systems Using the Scanning Kelvin Probe Technique

Borth

Iezzi

Dudis³

et al. 2019

CORROSION

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Defect Types

Faisal

Cora

Bekci

et al. 2021

Structural Health Monitoring Damage Detection Systems for Aerospace

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This chapter provides an overview of the common types of defects found in various structural materials and joints in aircraft. Materials manufacturing methods (including large-scale production) have been established in the aircraft industry. However, as will be seen in this chapter, manufacturing defects and defects during in-service conditions are very common across all material types. The structural material types include metals, composites, coatings, adhesively bonded and stir-welded joints. This chapter describes the defect types as a baseline for the description of their detection with the methods of Chap. 10.1007/978-3-030-72192-3_5 to 10.1007/978-3-030-72192-3_8. Based on the understanding of the defect types, there is great expectation for a technical breakthrough for the application of structural health monitoring (SHM) damage detection systems, where continuous monitoring and assessment with high throughput and yield will produce the desired structural integrity.

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Application and limitations of current understanding to model failure modes in coatings

Croll

2012

J Coat Technol Res

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The structural environment as a factor affecting coating failure in aircraft joints

Cited by 11 publications

References 17 publications

Nondestructive Evaluation of Urethane-Ester Coating Systems Using the Scanning Kelvin Probe Technique

Nondestructive Evaluation of Urethane-Ester Coating Systems Using the Scanning Kelvin Probe Technique

Defect Types

Application and limitations of current understanding to model failure modes in coatings

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