scholarly journals Evolution of the viscoelastic properties of painting stratigraphies: a moisture weathering and nanoindentation approach

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Mathilde Tiennot ◽  
Davide Iannuzzi ◽  
Erma Hermens
Keyword(s):  
Mechanical Properties ◽  
Relative Humidity ◽  
Cultural Heritage ◽  
Mechanical Behaviour ◽  
Viscoelastic Properties ◽  
Viscoelastic Behaviour ◽  
Storage And Loss Moduli ◽  
Heritage Studies ◽  
Paint Films ◽  
The Impact

AbstractIn this investigation on the mechanical behaviour of paint films, we use a new ferrule-top nanoindentation protocol developed for cultural heritage studies to examine the impact of repeated relative humidity variations on the viscoelastic behaviour of paint films and their mechanical properties in different paint stratigraphies through the changes in their storage and loss moduli. We show that the moisture weathering impact on the micromechanics varies for each of these pigment-oil systems. Data from the nanoindentation protocol provide new insights into the evolution of the viscoelastic properties dsue to the impact of moisture weathering on paint films.

Simulation of the Impact Behaviour of Diffusion-Bonded and Adhered Perforated Hollow Sphere Structures (PHSS)

2009 ◽  
Vol 294 ◽  
pp. 27-38 ◽  
Author(s):  
Fabian Ferrano ◽  
Marco Speich ◽  
Wolfgang Rimkus ◽  
Markus Merkel ◽  
Andreas Öchsner
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behaviour ◽  
Hollow Sphere ◽  
Large Deformations ◽  
The Finite Element Method ◽  
Impact Behaviour ◽  
New Type ◽  
The Impact

This paper investigates the mechanical properties of a new type of hollow sphere structure. For this new type, the sphere shell is perforated by several holes in order to open up the inner sphere volume and surface. The mechanical behaviour of perforated sphere structures under large deformations and strains in a primitive cubic arrangement is numerically evaluated by using the finite element method for different hole diameters and different joining techniques.

The impact of relative humidity during electrospinning on the morphology and mechanical properties of nanofibers

2013 ◽  
Vol 456 (1) ◽  
pp. 125-134 ◽  
Author(s):  
Jan Pelipenko ◽  
Julijana Kristl ◽  
Biljana Janković ◽  
Saša Baumgartner ◽  
Petra Kocbek
Keyword(s):  
Mechanical Properties ◽  
Relative Humidity ◽  
The Impact ◽  
Morphology And Mechanical Properties

scholarly journals Patrimônio Aplicado e Estudos de Patrimônio Crítico: engajando a sociedade para sustentabilidade e Patrimônios Futuros - Applied Heritage and Critical Heritage Studies engaging society to sustainability and Heritage Futures

2020 ◽  
Vol 17 (34) ◽  
pp. 44-57
Author(s):  
Tiago Silva Alves Muniz
Keyword(s):  
Cultural Heritage ◽  
Special Issue ◽  
Contemporary Archaeology ◽  
Educational Methods ◽  
Heritage Studies ◽  
Critical Heritage ◽  
America Latina ◽  
Global Futures ◽  
The Impact

O presente dossiê tem como objetivo engajando profissionais e a sociedade para sustentabilidade e Patrimônios Futuros. Atividades que refletem sobre museus, patrimônio sensível, educação patrimonial, turismo, arqueologia contemporânea e métodos fazem parte desta edição Cadernos do LEPAARQ, Revista do Laboratório de Ensino e Pesquisa em Antropologia e Arqueologia da Universidade Federal de Pelotas (LEPAARQ-UFPEL). O objetivo aqui é apresentar como museus e atividades internacionais lidam com patrimônio aplicado em diversos contextos e como suas propostas de ações pedagógicas/museológicas podem ser orientadas para o futuro. Para além do impacto da covid-19 no patrimônio cultural (Saladino Muniz, 2020), o dossiê visa dialogar com perspectivas da arqueologia no contemporâneo (Gonzalez-Ruibal, 2006; Hamilakis, 2018; McAtackney McGuire, 2020) abordando engajamento para futuro global considerando o papel do patrimônio cultural (Harrison et al 2020, Holtorf Högberg, 2020), visões desde a América Latina (Muniz Almansa-Sánchez, 2020), interpretações dos patrimônios (Rampim et al 2020) e métodos educacionais (Petersson Holtorf, 2016) no contexto do patrimônio aplicado e por uma saúde planetária (Horton et. Al. 2014). The present special issue aims to engage professionals and society for sustainability and heritage futures. Activities that reflect on museums, sensitive heritage, heritage education, tourism, contemporary archaeology and methods are part of this edition of Cadernos do LEPAARQ - Journal of the Laboratory of Teaching and Research in Anthropology and Archaeology of the Federal University of Pelotas (LEPAARQ-UFPEL). The objective here is to present how museums and international activities deal with applied heritage in different contexts and how their proposals for pedagogical / museological actions can be oriented towards the future. In addition to the impact of covid-19 on cultural heritage (Saladino Muniz, 2020), the special issue aims to dialogue with perspectives on contemporary archaeology (Gonzalez-Ruibal, 2006; Hamilakis, 2018; McAtackney McGuire, 2020), addressing engagement for global futures considering the role of cultural heritage (Harrison et al 2020, Holtorf Högberg, 2020), visions from Latin America (Muniz Almansa-Sánchez, 2020), interpretations of heritage (Rampim et al 2020), contexts of segregation and educational methods (Petersson Holtorf, 2016) in the context of applied heritage and for planetary health (Horton et. Al. 2014).

scholarly journals Heritage Cataloguing in History: Conceptual and Graphical Foundations of Immovable Cultural Heritage Data Bases in the Case of Spain

2021 ◽  
Vol 13 (19) ◽  
pp. 11043
Author(s):  
Roberto F. Alonso-Jiménez ◽  
Mar Loren-Méndez ◽  
Daniel Pinzón-Ayala ◽  
Francisco Ollero-Lobato
Keyword(s):  
Cultural Heritage ◽  
18Th Century ◽  
Special Focus ◽  
Data Bases ◽  
International Protection ◽  
Heritage Studies ◽  
Future Challenges ◽  
Main Instrument ◽  
Conceptual Evolution ◽  
The Impact

Cataloguing constitutes the main instrument for heritage assessment and management around the world, and is central in heritage studies. In the context of the growing international protection of heritage since the 20th century and the irruption and implementation of digital tools, cultural heritage data bases (CHDBs) have emerged as the main systems in accounting for and monitoring heritage. In the framework of culture preservation, as a driving force of sustainable development, this article aims to analyse the origins and development of CHDBs in order to critically observe the current situation and outline future challenges for systems of cataloguing heritage with the growing relevance of its graphical documentation. In this context, a historical overview of the origin and development of the European inventories since the 18th century to the present is key to trace the development of catalogue systems and the impact of IT in this field. The study then focuses on immovable cultural heritage data bases (ICHDBs); with Spain as case study, it develops an approach to the current panorama, with a special focus on the conceptual evolution of catalogues. In conclusion, ICHDBs need to transcend both instrumental and institutional roles and, supported in new digital systems, become interactive and flexible tools that respond to current needs and encourage heritage education, knowledge, and reflection.

Mechanical Response of Laminate (Glass/Epoxy) at Different Periods of Environmental Conditioning (Saturation and Ageing)

2010 ◽  
Vol 34-35 ◽  
pp. 1015-1018
Author(s):  
A. Naceri
Keyword(s):  
Mechanical Properties ◽  
Relative Humidity ◽  
Glass Fiber ◽  
Mechanical Behaviour ◽  
Mechanical Response ◽  
Laminate Glass ◽  
Moisture Concentration ◽  
Environmental Conditioning ◽  
Hygrothermal Ageing ◽  
Fiber Fabric

This paper considers the analysis of the mechanical behaviour of a laminate constituted of 12 layers of glass fiber fabric/epoxy resin conditioned at different relative humidities of 0, 60 and 96% at 60 °C. The analysing of the experimental results obtained of hygrothermal ageing on the mechanical response has permited to show that the influence of the moisture concentration on the ultimate mechanical properties becomes significant and important for the composite conditioned at relative humidity of 96% to the periods I and II (state of saturation and ageing).

scholarly journals The orthotropic viscoelastic characterisation of sub-zero 3D-printed poly(vinyl alcohol) cryogel

MRS Advances ◽  
2021 ◽  
Author(s):  
J. P. Crolla ◽  
M. M. Britton ◽  
D. M. Espino ◽  
L. E. J. Thomas-Seale
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Complex Geometry ◽  
Processing Parameters ◽  
Poly Vinyl Alcohol ◽  
Additive Manufacture ◽  
Storage And Loss Moduli ◽  
3D Printed ◽  
Orthotropic Properties ◽  
The Impact

Abstract Poly(vinyl alcohol) cryogel (PVA) is a versatile biomaterial used to replicate the biomechanics of tissues. Additive manufacture (AM) at sub-zero (°C) temperatures enables the manufacture of PVA with complex geometry; however, the effect of processing parameters on the mechanical properties of PVA has not been evaluated. The aim of this study is to understand the impact of print nozzle diameter and orientation on the viscoelastic mechanical properties of PVA. Samples of sub-zero AM PVA, with different filament thicknesses, were tested under tension relative to the print direction, to calculate the storage and loss moduli. As the nozzle size was decreased, AM PVA exhibited more pronounced orthotropic properties; the smallest size showed a 33% decrease in storage moduli when tested perpendicular to the print direction, as opposed to parallel. This study has demonstrated the ability of sub-zero AM to tailor the orthotropic properties of PVA. Graphic abstract

scholarly journals Design of Stretchable Electronics Against Impact

2016 ◽  
Vol 83 (10) ◽  
Author(s):  
J. H. Yuan ◽  
M. Pharr ◽  
X. Feng ◽  
John A. Rogers ◽  
Yonggang Huang
Keyword(s):  
Mechanical Properties ◽  
Viscoelastic Properties ◽  
Critical Thickness ◽  
Impact Resistance ◽  
Stretchable Electronics ◽  
Analytic Model ◽  
Device Failure ◽  
Low Modulus ◽  
Physical Impact ◽  
The Impact

Stretchable electronics offer soft, biocompatible mechanical properties; these same properties make them susceptible to device failure associated with physical impact. This paper studies designs for stretchable electronics that resist failure from impacts due to incorporation of a viscoelastic encapsulation layer. Results indicate that the impact resistance depends on the thickness and viscoelastic properties of the encapsulation layer, as well as the duration of impact. An analytic model for the critical thickness of the encapsulation layer is established. It is shown that a commercially available, low modulus silicone material offers viscous properties that make it a good candidate as the encapsulation layer for stretchable electronics.

Effect of combined drink cans and steel fibers on the impact resistance and mechanical properties of concrete

2020 ◽  
Vol 14 (2) ◽  
pp. 6734-6742
Author(s):  
A. Syamsir ◽  
S. M. Mubin ◽  
N. M. Nor ◽  
V. Anggraini ◽  
S. Nagappan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Impact Resistance ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Indirect Tensile ◽  
The Impact

This study investigated the combine effect of 0.2 % drink cans and steel fibers with volume fractions of 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% to the mechanical properties and impact resistance of concrete. Hooked-end steel fiber with 30 mm and 0.75 mm length and diameter, respectively was selected for this study.  The drinks cans fiber were twisted manually in order to increase friction between fiber and concrete. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the strength performance of concrete, especially the compressive strength, flexural strength and indirect tensile strength. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the compressive strength, flexural strength and indirect tensile strength by 2.3, 7, and 2 times as compare to batch 1, respectively. Moreover, the impact resistance of fiber reinforced concrete has increase by 7 times as compared to non-fiber concretes. Moreover, the impact resistance of fiber reinforced concrete consistently gave better results as compared to non-fiber concretes. The fiber reinforced concrete turned more ductile as the dosage of fibers was increased and ductility started to decrease slightly after optimum fiber dosage was reached. It was found that concrete with combination of 2% steel and 0.2% drink cans fibers showed the highest compressive, split tensile, flexural as well as impact strength.    

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