Hygro-mechanical response of oak wood cabinet door panels under relative humidity fluctuations

Luimes, R.A.; Suiker, A.S.J.; Jorissen, A.J.M.; Duin, P.H.J.C. van; Schellen, H.L.

doi:10.1186/s40494-018-0233-y

Cited by 11 publications

(14 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thickness of wooden panel T was changed in the range between 5 and 40 mm typical of historical panels. The out of plane direction corresponded to the longitudinal, dimensionally stable direction of wood, therefore, the condition of plane strain was adopted (strain ε z = 0), evidenced by earlier experimental data [35]. The width of the modelled part W varied depending on a spacing between cracks S at the gesso surface so that the distance from each boundary to the nearest crack was three times of S. Hence, the total width of the modelled part was 9S as crack thickness was negligible.…”

Section: Modelling Fracture Saturationmentioning

confidence: 99%

Fracture saturation in paintings makes them less vulnerable to environmental variations in museums

2020

View full text Add to dashboard Cite

Understanding paintings as physical systems is fundamental for advancing environmental specifications that would allow for effective management of museum environments in terms of reducing energy use and carbon emissions while maintaining high standards of collection care. The current environmental specifications were derived using the criterion of the crack initiation in undamaged, usually new, material. In reality, historical paintings exhibit complex crack patterns called craquelures. The present paper analyses painted wood which is among the category of cultural objects most vulnerable to relative humidity and temperature fluctuations and frequently found in museum collections of various kinds. Fracture toughness determined experimentally for the most brittle component of pictorial layer-the ground layer (gesso) is used as a 'failure criterion' . Comparison of energy release rate-calculated for the model of the gesso laid on a wooden substrate using finite element analysis-with the structure toughness, allowed the fracture saturation expressed as the ratio of spacing between cracks S to gesso layer thickness t to be determined for various combinations of the gesso stiffness and geometries of structural flaws at which cracks initiate. For flat geometry of a panel painting and panel thickness of 40 mm, representing the worst-case, largest stresses in the gesso layer, the fracture saturation occurs when S/t is larger than 5, even if flaws in the gesso layer are present. The paper shows that the fracture saturation significantly changes vulnerability of paintings to climate variations-a panel painting with developed craquelure network is significantly less vulnerable to climate variations than an undamaged one.

show abstract

Section: Modelling Fracture Saturationmentioning

confidence: 99%

Fracture saturation in paintings makes them less vulnerable to environmental variations in museums

2020

View full text Add to dashboard Cite

show abstract

“…The assumption of elastic isotropy is acceptable for most paints; the substrate, however, is anisotropic in the case of wood or canvas, and this will lead to some inaccuracy in the predicted fracture response as computed herein. However, as demonstrated in a recent study on the fracture of both historic and new oak wood samples (Luimes et al 2018b), the error is minor if the crack face normal aligns with a specific material direction, and the assumed value of Young's modulus for the isotropic elastic solid equals the anisotropic stiffness in the direction of the crack face normal.…”

Section: Pictures Courtesy Of Matteo Rossi Doriamentioning

confidence: 98%

Crack channelling mechanisms in brittle coating systems under moisture or temperature gradients

2020

Self Cite

View full text Add to dashboard Cite

Crack channelling is predicted in a brittle coating-substrate system that is subjected to a moisture or temperature gradient in the thickness direction. Competing failure scenarios are identified, and are distinguished by the degree to which the coating-substrate interface delaminates, and whether this delamination is finite or unlimited in nature. Failure mechanism maps are constructed, and illustrate the sensitivity of the active crack channelling mechanism and associated channelling stress to the ratio of coating toughness to interfacial toughness, to the mismatch in elastic modulus and to the mismatch in coefficient of hygral or thermal expansion. The effect of the ratio of coating to substrate thickness upon the failure mechanism and channelling stress is also explored. Closed-form expressions for the steady-state delamination stress are derived, and are used to determine the transition value of moisture state that leads to unlimited delamination. Although the results are applicable to coating-substrate systems in a wide range of applications, the study focusses on the prediction of cracking in historical paintings due to indoor climate fluctuations, with the objective of helping museums developing strategies for the preservation of art objects. For this specific application, crack channelling with delamination needs to be avoided under all circumstances, as it may induce flaking of paint material. In historical paintings, the substrate thickness is typically more than ten times larger than the thickness of the paint layer; for such a system, the failure maps constructed from the numerical simulations indicate that paint delamination is absent if the delamination toughness is larger than approximately half of the mode I toughness of the paint layer. Further, the transition between crack channelling with and without delamination appears to be relatively insensitive to the mismatch in the elastic modulus of the substrate and paint layer. The failure maps developed in this work may provide a useful tool for museum conservators to identify the allowable indoor humidity and temperature fluctuations for which crack channelling with delamination is prevented in historical paintings.

show abstract

“…The empirical data obtained from the museum study were used for the experimental study of the Climate4Wood research project. The experimental work, involving exposure of mock-ups to well-controlled climate fluctuations, was designed on the basis of the results of this study (Luimes, 2018). The results from both these studies can be used as input parameters and validation of the thermohygromechanical modeling.…”

Section: Complex Panelsmentioning

confidence: 99%

The Mechanics of Art Materials and Its Future in Heritage Science

Rogala¹,

DePriest²,

Charola³

et al. 2019

Preprint

View full text Add to dashboard Cite

<div>In late 2016, “The Mechanics of Art Materials and Its Future in Heritage Science: A Seminar and Symposium” was held at the Smithsonian Institution’s historic Arts and Industries Building. Organized by the Smithsonian’s Museum Conservation Institute (MCI) and the Royal Danish Academy of Fine Arts, Schools of Architecture, Design and Conservation, the two-day event brought experts in mechanics research from across the globe to discuss current and future trends in the study and preservation of cultural heritage. Speakers represented a continuum of innovative mechanics research in the cultural heritage sector, from its origins at the Smithsonian to current professionals working to shape the field and train future generations of scholars. The event began with the popular paint mechanics workshop created and taught by MCI senior research scientist emeritus Marion Mecklenburg, condensed into a single-day seminar of lectures and discussion. The second day featured an international group of speakers and case studies on the state of mechanics research around the globe, with an afternoon program focused on emerging U.S.-based speakers and their thoughts on the future of the field. This volume reflects a collaborative view of cultural heritage research in mechanics; beginning with a review of mechanics research at the Smithsonian Institution and followed by the nine papers presented by the symposium speakers, this publication incorporates the work of 15 national and international research centers. The Appendix includes a bibliography of Dr. Mecklenburg’s publications and his previously unpublished 1982 report on the mechanical behavior of painting materials.</div>

show abstract

Hygro-mechanical response of oak wood cabinet door panels under relative humidity fluctuations

Cited by 11 publications

References 18 publications

Fracture saturation in paintings makes them less vulnerable to environmental variations in museums

Fracture saturation in paintings makes them less vulnerable to environmental variations in museums

Crack channelling mechanisms in brittle coating systems under moisture or temperature gradients

The Mechanics of Art Materials and Its Future in Heritage Science

Contact Info

Product

Resources

About