Magnets in Conservation of Easel Paintings : Mechanical Forces between Magnets and a Thin Paint Layer / Zuzanna Szozda in Studies in conservation, Vol.70 N°5-6(2025; July-August) (2025-07-01)  

Public ISBD [article]  inStudies in conservation > Vol.70 N°5-6(2025; July-August) (2025-07-01) . - P. 417-437 Titre : Magnets in Conservation of Easel Paintings : Mechanical Forces between Magnets and a Thin Paint Layer Type de document : texte imprimé Auteurs : Zuzanna Szozda (19..-....), Auteur ; Stan Zurek (19..-....), Auteur Année de publication : 2025 Article en page(s) : P. 417-437 Note générale : Fig., tabl. Langues : Anglais (eng) Catégories : Aimants -- Physique -- Recherche Contraintes (mécanique) Déformations (mécanique) -- Recherche Matériaux -- Propriétés magnétiques Peinture -- Conservation et restauration Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Abstract : This paper discusses the mechanical interactions between a magnet and a thin paint layer situated on a non-magnetic substrate, for example, to correct painting deformations or to fix pictorial layers. Crucial to calculating the attraction force F is knowing the magnetic susceptibility χ in the paint layer center XC and also the gradient dH/dx across the paint (calculated from magnetic fields H on both sides XS and XE of the layer). However, the susceptibility χ depends on the magnetic field H which is a function of the distance from the magnet’s pole: χ = f(H(XC)). It should be noted that as the magnet approaches the paint layer, the value of the field H(x) increases, but the susceptibility of the substance χ(H(x)) decreases. Analytical formulas and practical calculation schemes for mechanical forces in the discussed magnetic systems are presented in detail. As a result of the undertaken work, interactive on-line calculators for calculating magnetic fields and forces were developed and made available online. Reliable estimation of mechanical forces due to magnets, as presented here, allows for more controlled and reproducible conservation results. Therefore, the principle of minimal intervention and reversibility can be attained repeatably with greater ease, laying the groundwork for improved protocols. En ligne : https://www.tandfonline.com/doi/full/10.1080/00393630.2024.2429342 [article] Magnets in Conservation of Easel Paintings : Mechanical Forces between Magnets and a Thin Paint Layer [texte imprimé] / Zuzanna Szozda (19..-....), Auteur ; Stan Zurek (19..-....), Auteur . - 2025 . - P. 417-437. Fig., tabl. Langues : Anglais (eng) in Studies in conservation > Vol.70 N°5-6(2025; July-August) (2025-07-01) . - P. 417-437 Catégories : Aimants -- Physique -- Recherche Contraintes (mécanique) Déformations (mécanique) -- Recherche Matériaux -- Propriétés magnétiques Peinture -- Conservation et restauration Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Abstract : This paper discusses the mechanical interactions between a magnet and a thin paint layer situated on a non-magnetic substrate, for example, to correct painting deformations or to fix pictorial layers. Crucial to calculating the attraction force F is knowing the magnetic susceptibility χ in the paint layer center XC and also the gradient dH/dx across the paint (calculated from magnetic fields H on both sides XS and XE of the layer). However, the susceptibility χ depends on the magnetic field H which is a function of the distance from the magnet’s pole: χ = f(H(XC)). It should be noted that as the magnet approaches the paint layer, the value of the field H(x) increases, but the susceptibility of the substance χ(H(x)) decreases. Analytical formulas and practical calculation schemes for mechanical forces in the discussed magnetic systems are presented in detail. As a result of the undertaken work, interactive on-line calculators for calculating magnetic fields and forces were developed and made available online. Reliable estimation of mechanical forces due to magnets, as presented here, allows for more controlled and reproducible conservation results. Therefore, the principle of minimal intervention and reversibility can be attained repeatably with greater ease, laying the groundwork for improved protocols. En ligne : https://www.tandfonline.com/doi/full/10.1080/00393630.2024.2429342

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