Influence of Ageing on Mechanical Properties of Epoxy Coatings

Kotnarowska, D.; Wojtyniak, M.

doi:10.4028/www.scientific.net/ssp.147-149.825

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…Accelerated ageing had the highest influence on the fibre synthetic paper (Paper 3), which had among all papers the highest roughness. The environmental action causes oxidation of the coating surface layers and in this way deteriorates the cohesion between the filler particles and polymer matrix, which results in increased roughness of the polymer coating surface [25].…”

Section: Discussionmentioning

confidence: 99%

Durability of Cellulose and Synthetic Papers Exposed to Various Methods of Accelerated Ageing

Karlovits¹,

Gregor-Svetec²

2012

ACTA POLYTECH HUNG

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The paper presents a study of the stability of cellulose and synthetic papers exposed to various methods of accelerated ageing. Particular consideration was given to the optical and mechanical stability of six paper samples (one film synthetic paper, two fibre synthetic papers, one lignin-free paper of higher quality and two security cellulose papers), which have undergone changes during accelerated ageing. The papers were artificially aged using standard techniques of accelerated ageing, e.g. moist-heat (80 °C and 65% RH), dry-heat (105 °C) and treatment with a xenon arc lamp (35 °C CT, 50 °C BST, 35% RH). The ageing was performed for the periods of 1, 2, 3, 6 and 12 days. The changes in the optical (ISO brightness, Yellowness Index), surface (roughness, paper topography) and mechanical stability (zero-span tensile strength, elongation at break, folding endurance) of papers were measured during the periods of accelerated ageing. The results show that the differences between synthetic and cellulose papers exist. On average, the dry-heat ageing had the highest influence on ISO brightness and Yellowness Index on synthetic papers, while the treatment with a xenon lamp had the strongest influence on cellulose papers. A comparison of mechanical properties showed that synthetic papers are more durable than cellulose paper; they had higher zero-span tensile strength and folding endurance, and showed substantially better ageing resistance to dry-heat and moist-heat accelerated ageing than cellulose papers. It was also noticed that the surface roughness increased after all three accelerated ageing processes.

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Section: Discussionmentioning

confidence: 99%

Durability of Cellulose and Synthetic Papers Exposed to Various Methods of Accelerated Ageing

Karlovits¹,

Gregor-Svetec²

2012

ACTA POLYTECH HUNG

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“…Let us mention that paraglider fabrics are also highly exposed to external factors, such us UV radiation, gusts or moisture [1,11,12]. Multiple unpacking and packing of the paraglider wing can cause mechanical degradation, whereas improper storage in temperatures that are too low or too high can also have unfavorable influence on the material properties of the wing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Material Degradation on Deformation of Paraglider during Flight

et al. 2023

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The aim of this article is to determine experimentally and numerically the influence of material degradation on the deformation of a paraglider during flight. The presented method regards numerical modeling of pressure distribution over the wing and its effect on paraglider behavior; the considerations are preceded by experiments on three types of Polyamide 6.6 paraglider fabrics, subjected and not subjected to thermal, UV and flexing degradation. Scanning electron microscope (SEM) records allowed to determine the structural characteristics of the analyzed samples. Air permeability and mechanical tests are the input data for the computational simulations. When a pressure drop of 200 Pa is applied, all the analyzed samples are impermeable, except for those damaged by flexing. Thus, flexing damage has the greatest influence on the air permeability change among all considered aging factors. Aging caused by UV radiation has the greatest influence on mechanical properties. No major influence of thermal ageing on the mechanical properties of the considered samples is observed. Safety factors of the considered materials not subjected to degradation range between 3.94 and 6.00. Safety factor of fabric no. 1 subjected to the UV degradation is equal to 1.33; this result does not secure a safe usage of the considered material. The methodology described in this research can help to predict paraglider covering materials’ behavior in flight; it assumes many cases, i.e., applying a new material or the material at any point of its life cycle. Thus, the practical implications of this model supported by numerical methods may result in saving time and cost in producing prototypes, as well as potentially assessing the safety of used wings. Future research activity can introduce the application of different elastic–plastic damage models to determine the paraglider behavior during collapse.

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“…The resistance to erosive wear of polymer coatings was evaluated applying the criterion S according to Equation (1). It expresses a proportion of the total mass M of erosive particles which erode the coating (exposing the steel substrate surface of the ellipsoid shape with the minor diameter d = 3.6 ± 0.1 mm) to the coating thickness G: (Figure 3).…”

Section: Methodology Of the Erosive Wear Resistance Evaluationmentioning

confidence: 99%

“…impact the surface of the object. Hard particles cause wear of the surface which leads to material losses in the superficial layer [2,3,4]. Erosive wear of polymer coatings manifests itself in abrasion, peeling, scratching, losses of their parts as well as deformation of the coating with substrate-in the places where erosive particles impact the coating.…”

Section: Introductionmentioning

confidence: 99%