scholarly journals Role of starting material composition in interfacial damage morphology of hafnia-silica multilayer coatings

1999 ◽  
Author(s):  
S. C. Weakley ◽  
Christopher J. Stolz ◽  
Zhouling Wu ◽  
Ron P. Bevis ◽  
Marc K. Von Gunten
Keyword(s):  
Starting Material ◽  
Material Composition ◽  
Multilayer Coatings ◽  
Interfacial Damage ◽  
Damage Morphology

On the Role of Nonlinearity in the Dynamic Behavior of Rubber Components

1986 ◽  
Vol 59 (5) ◽  
pp. 740-764 ◽  
Author(s):  
J. Harris ◽  
A. Stevenson
Keyword(s):  
Dynamic Behavior ◽  
Nonlinear Behavior ◽  
Material Composition ◽  
Geometrical Design ◽  
Linear Spring ◽  
Case Design

Abstract This paper has discussed the transmissibility behavior of rubber mounts with reference to nonlinearity originating from the material composition and from the geometrical design. It has been shown that in many cases, linear assumptions can be made, provided the limitations of these assumptions are understood. In this case, design can proceed as for a linear spring. Finally, there is some indication of how the nonlinear behavior can be exploited to advantage in the design of novel suspension components.

Influence of the nanostructure of the functional layers of a multilayer coating on the wear of a carbide tool

2021 ◽  
pp. 332-336
Author(s):  
A.A. Vereshchaka ◽  
V.P. Tabakov
Keyword(s):  
Fracture Resistance ◽  
Crack Formation ◽  
Multilayer Coating ◽  
Multilayer Coatings ◽  
Carbide Tool ◽  
Scratch Testing ◽  
Nanolayer Thickness

The results of studies of the effect of nanolayer thickness on the wear of carbide tools are presented. The effect of nanolayer thicknesses on microhardness and fracture resistance of a multilayer coating during scratch testing is shown. The role of nanostructure in the processes of crack formation in multilayer coatings during cutting is revealed.

Identification Scheme to Assess the Role of Interfacial Damage in a Hemp-Starch Biocomposite

2014 ◽  
Vol 875-877 ◽  
pp. 524-528
Author(s):  
Sofiane Guessasma ◽  
Mohameden Hbib ◽  
David Bassir
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Precise Determination ◽  
Mechanical Parameters ◽  
Interfacial Damage ◽  
Failure Properties ◽  
Experimental Response

This paper aims at studying the effect of interfacial damage on the mechanical behavior of starch - hemp composite. The procedure encompasses an experimental investigation towards the determination of microstructural features and mechanical testing of the material. A finite element model is developed to account for a particular damage kinetics that triggers failure properties. Our results show that the experimental evidence of interfacial damage driven failure is achieved. Finite element model is able to capture this feature using an abrupt damage criterion. But in order to identify the observed behavior, the experimental response is matched with the numerical one. This process tunes the mechanical parameters to fit the experimental response. The optimization process conducted in this way leads to a precise determination of the mechanical parameters that quantifies the observed ultimate properties.

The effect of starting material composition on the growth of Bi-based ribbon-like thin films

2003 ◽  
Vol 13 (2) ◽  
pp. 2856-2859
Author(s):  
Yanjing Su ◽  
Y. Satoh ◽  
S. Arisawa ◽  
T. Awane ◽  
Y. Takano ◽  
...  
Keyword(s):  
Thin Films ◽  
Starting Material ◽  
Material Composition

scholarly journals The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2554
Author(s):  
Artem Marikutsa ◽  
Marina Rumyantseva ◽  
Elizaveta A. Konstantinova ◽  
Alexander Gaskov
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Active Sites ◽  
Noble Metals ◽  
Material Composition ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Sensor Materials ◽  
The Impact

Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

A Numerical Study on the Mechanical Behaviour of Hard Coatings with Ductile Interlayers under Depth-Sensing Indentation

2010 ◽  
Vol 636-637 ◽  
pp. 1194-1198
Author(s):  
Nataliya A. Sakharova ◽  
José Valdemar Fernandes ◽  
Marta C. Oliveira ◽  
Jorge M. Antunes
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behaviour ◽  
Numerical Study ◽  
Multilayer Coating ◽  
Hard Coatings ◽  
Multilayer Coatings ◽  
Depth Sensing ◽  
Ductile Metals ◽  
Titanium Aluminium

In the present study, numerical simulations of nanohardness tests of titanium aluminium nitride (TiAlN) hard coatings with titanium and aluminium ductile interlayers were performed in order to determine the influence of interlayers of ductile metals on the overall mechanical properties of multilayer coatings. The investigation was designed to determine the role of ductile interlayers in altering the hardness value and the Young´s modulus of the multilayer coating as a whole, in comparison with a monolayer TiAlN hard coating, for the cases of composites with different numbers and thicknesses of interlayers.

The role of material composition, fiber properties and deformation mechanisms in the deep drawing of paperboard

Cellulose ◽  
2015 ◽  
Vol 22 (5) ◽  
pp. 3377-3395 ◽  
Author(s):  
Marek Hauptmann ◽  
Malte Wallmeier ◽  
Klaus Erhard ◽  
Roland Zelm ◽  
Jens-Peter Majschak
Keyword(s):  
Deep Drawing ◽  
Material Composition ◽  
Deformation Mechanisms ◽  
Fiber Properties

Role of Material Composition in Photothermal Actuation of DASA-Based Polymers

2022 ◽  
Author(s):  
Miranda M. Sroda ◽  
Jaejun Lee ◽  
Younghoon Kwon ◽  
Friedrich Stricker ◽  
Minwook Park ◽  
...  
Keyword(s):  
Material Composition

scholarly journals The Role of Geometry on a Self-Sustaining Bio-Receptive Concrete Panel for Facade Application

2021 ◽  
Vol 13 (13) ◽  
pp. 7453
Author(s):  
Kazi Fahriba Mustafa ◽  
Alejandro Prieto ◽  
Marc Ottele
Keyword(s):  
Design Variable ◽  
Water Retention ◽  
Absorption Capacity ◽  
Design Guidelines ◽  
Environmental Benefits ◽  
Material Composition ◽  
Surface Geometry ◽  
Concrete Panels

Bio-receptivity refers to the aptitude of a material to allow for the natural growth of small plant species on stony surfaces with minimum external influence. Despite the numerous associated environmental benefits, the growth of mosses and lichens on facades has always been viewed as a negative phenomenon due to the random and shabby growth conditions. This research dealt with the design of a self-sustaining bio-receptive concrete facade system with an aim to create a more sustainable and green concrete for the construction industry. The research used surface geometry as a design variable to facilitate moss growth on concrete panels in an ordered and systematic manner. The exercise was an attempt to not only address the functional aspect of bio-receptivity but also its aesthetical quality, which has a primary influence on people’s perception of bio-receptivity and can promote mass use of this type of concrete material. The research was conducted in a top-down approach, where first, through design by research, six distinctly designed concrete panels were fabricated using adapted material composition (blast furnace cement with 75% slag, 0.6 water/cement, sand 0–4 mm and gravel 5–8 mm) as the boundary condition. The concrete mixture together with no curing policy resulted in highly porous concrete panels, suitable for bio-receptive properties. Next in the design validation phase, the influence of surface geometry/roughness on the water retention ability of the panels and the subsequent moss growth on the panels were evaluated through in vitro experiments. The water retention experiment of the panels was based on quantitative measurements for weight, relative humidity and temperature at several time intervals. The moss-growing experiment was carried out within an ideal greenhouse condition where the panels were initially inoculated with moss spores; the results were based on qualitative observation for a period of 4 months. According to the comparative analysis of these results, with the same material composition, Panel 2 showed the highest bio-colonization owing to its prominent surface geometry, whereas Panel 5 showed the least bio-colonization owing to its plain surface despite high absorption capacity. Thus, the role of geometry has been extensively proven in this research and as an outcome a set of general design guidelines have been formulated for a self-sustaining bio-receptive concrete facade panel, using geometry as a design variable for bio-receptivity.

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