Modeling PVC-coated polyester as a hypoelastic non-linear orthotropic material

Jekel, Charles F.; Venter, Gerhard; Venter, Martin Philip

doi:10.1016/j.compstruct.2016.11.019

Cited by 22 publications

(17 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We calculated the glass transition temperatures by fitting the data to two piecewise linear functions, using the pwlf package. 45 All snapshots from simulations were rendered by using the Visual Molecular Dynamics (VMD) software. 46 For hydrogen bond analysis, the criteria of hydrogen–donor–acceptor angle of 30° and a donor–acceptor distance of 0.35 nm were used.…”

Section: Methodsmentioning

confidence: 99%

Acrylic Paints: An Atomistic View of Polymer Structure and Effects of Environmental Pollutants

et al. 2021

View full text Add to dashboard Cite

Most of the artwork and cultural heritage objects are stored in museums under conditions that are difficult to monitor. While advanced technologies aim to control and prevent the degradation of cultural heritage objects in line with preventive conservation measures, there is much to be learned in terms of the physical processes that lead to the degradation of the synthetic polymers that form the basis of acrylic paints largely used in contemporary art. In museums, stored objects are often exposed to temperature and relative humidity fluctuations as well as airborne pollutants such as volatile organic compounds (VOCs). The glass transition of acrylic paints is below room temperature; while low temperatures may cause cracking, at high temperatures the sticky surface of the paint becomes vulnerable to pollutants. Here we develop fully atomistic models to understand the structure of two types of acrylic copolymers and their interactions with VOCs and water. The structure and properties of acrylic copolymers are slighlty modified by incorporation of a monomer with a longer side chain. With favorable solvation free energies, once absorbed, VOCs and water interact with the polymer side chains to form hydrogen bonds. The cagelike structure of the polymers prevents the VOCs and water to diffuse freely below the glass transition temperature. In addition, our model forms the foundation for developing mesoscopic and continuum models that will allow us to access longer time and length scales to further our understanding of the degradation of artwork.

show abstract

Section: Methodsmentioning

confidence: 99%

Acrylic Paints: An Atomistic View of Polymer Structure and Effects of Environmental Pollutants

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Using measurements of local contrast, a custom Python program measured for each pixel which layer—and thus height—the eye surface is in greatest focus ( Figure 3 B top), approximating the 3D eye surface ( Figure 3 B bottom). Eye radius was calculated by finding the best fitting sphere to the 3D eye surface ( Figure 3 C) using ordinary least squares as in Jekel (2016) . The spherical model was a good fit and explains roughly the same proportion of the variance in eye surface values (R 2 ≅ .8) for all three genotypes ( Figure 3 D).…”

Section: Resultsmentioning

confidence: 99%

Acuity and summation strategies differ in vinegar and desert fruit flies

et al. 2022

View full text Add to dashboard Cite

Summary An animal's vision depends on terrain features that limit the amount and distribution of available light. Approximately 10,000 years ago, vinegar flies ( Drosophila melanogaster ) transitioned from a single plant specialist into a cosmopolitan generalist. Much earlier, desert flies ( D. mojavensis ) colonized the New World, specializing on rotting cactuses in southwest North America. Their desert habitats are characteristically flat, bright, and barren, implying environmental differences in light availability. Here, we demonstrate differences in eye morphology and visual motion perception under three ambient light levels. Reducing ambient light from 35 to 18 cd/m 2 causes sensitivity loss in desert but not vinegar flies. However, at 3 cd/m 2 , desert flies sacrifice spatial and temporal acuity more severely than vinegar flies to maintain contrast sensitivity. These visual differences help vinegar flies navigate under variably lit habitats around the world and desert flies brave the harsh desert while accommodating their crepuscular lifestyle.

show abstract

“…The different warp and weft properties of the PVDF coated fabrics show apparent anisotropy. [ 26–28 ] So the bias angle between initial slit notch and yarn orientation is studied, the bias angle is 0°, 15°, 30°, 45°, 60°, 75°. The standard tensile rate was 100 mm/min.…”

Section: Materials and Methodologymentioning

confidence: 99%

Central tearing behavior of PVDF coated fabrics with multiple initial notches

Zhang

et al. 2020

Polymer Composites

View full text Add to dashboard Cite

Tear failure is an essential issue for membrane structures, but always ignored in the current design specifications or codes. This paper presents the central tearing behaviors of PVDF coated fabrics with initial notches. Then, the influence of notches number, notches length, and notches orientation were considered. Finally, the tearing mechanisms under multiple initial notches were systematically studied. The results show that the strength of PVDF coated fabrics is significantly affected by the parameters of initial notches, which is significantly related to the failure modes. Among all the factors, the initial notches' length has the greatest influence on specimens' failure strength. With the initial notch length increases, the tear strength decreases, and the elongation at break remains almost unchanged. As the distance between multiple notches increases, the tear strength decreases, and the elongation at break increases. As the notch angle of inclination increases, the tear strength increases, and the elongation at break increases. It can provide important references to the design and analysis of membrane structures.

show abstract

Modeling PVC-coated polyester as a hypoelastic non-linear orthotropic material

Cited by 22 publications

References 11 publications

Acrylic Paints: An Atomistic View of Polymer Structure and Effects of Environmental Pollutants

Acrylic Paints: An Atomistic View of Polymer Structure and Effects of Environmental Pollutants

Acuity and summation strategies differ in vinegar and desert fruit flies

Central tearing behavior of PVDF coated fabrics with multiple initial notches

Contact Info

Product

Resources

About