scholarly journals THE EFFECT OF THICKNESS OF POLYURETHANE LAYER AND TOP COATING LAYER ON FATIGUE RESISTANCE OF FLUID-APPLIED POLYURETHANE MEMBRANE SYSTEM

2020 ◽  
Vol 85 (768) ◽  
pp. 177-183
Author(s):  
Yumiko NAKAJIMA ◽  
Saori ISHIHARA ◽  
Kyoji TANAKA
Keyword(s):  
Fatigue Resistance ◽  
Coating Layer ◽  
Membrane System ◽  
Polyurethane Membrane

Spherical Indentation on Glass-Coated Al2TiO5-Mullite Composites

2007 ◽  
Vol 336-338 ◽  
pp. 2414-2417
Author(s):  
Kee Sung Lee ◽  
Sang Hyun Park ◽  
Ik Jin Kim
Keyword(s):  
Elastic Modulus ◽  
Mechanical Strength ◽  
Fatigue Resistance ◽  
Coating Layer ◽  
High Hardness ◽  
Spherical Indentation ◽  
Glass Layer ◽  
Glass Coating ◽  
Aluminum Titanate ◽  
High Mechanical Strength

A glass layer with high hardness and fatigue resistance is coated on the aluminum titanate (Al2TiO5) – mullite (3Al2O3⋅2SiO2) composites to improve wear and fatigue resistances. Mullite is added to aluminum titanate to constraint the decomposition of aluminum titanate and exhibit high mechanical strength as well as high elastic modulus. The aluminum titanate composites with various quasi-ductilities through controlling the contents of mullite in the substrate layers are prepared in this study. The results of the load-displacement curves and the resulting contact damages on the surface of glass coating layer by spherical indentation indicate that mullite addition and the glass coating is effective.

About the Calculus of Fatigue Resistance to Limited Durability for Thermoplastic Polyurethane Membrane

2015 ◽  
Vol 811 ◽  
pp. 29-34
Author(s):  
Mihaela Suciu ◽  
Mihai Sorin Tripa ◽  
Lucia Ghioltean ◽  
Daniela Paunescu
Keyword(s):  
Finite Elements ◽  
Digital Image Correlation ◽  
Fatigue Resistance ◽  
Original Work ◽  
Mechanical Characteristics ◽  
Thermoplastic Polyurethane ◽  
Correlation Method ◽  
Image Correlation ◽  
Geometrical Characteristics ◽  
Polyurethane Membrane

This paper presents an original work about the calculus of fatigue resistance to limited durability for a desmopan membrane, a thermoplastic polyurethane membrane. For this research we needed the values of stresses, determined by Finite Elements Method (FEM). In order to apply FEM, we needed mechanical characteristics of thermoplastic polyurethane membrane, characteristics that have been determined by Digital Image Correlation Method. Mechanical characteristics and geometrical characteristics, with loadings too, are input for FEM soft. The calculus of fatigue resistance to limited durability serves to reliability studies of the thermoplastic polyurethane membranes, that diaphragm pumps are equipped.

A Freeze-Etch Study of Acinetobacter SP. Grown on a Hydrocarbon Substrate

1974 ◽  
Vol 32 ◽  
pp. 174-175
Author(s):  
C. L. Scott ◽  
W. R. Finnerty
Keyword(s):  
Membrane System ◽  
Structural Distortion ◽  
Intracytoplasmic Membrane ◽  
Gram Negative ◽  
Sectioned Material ◽  
Acinetobacter Sp

Acinetobacter sp. HO-1-N, a gram-negative hydrocarbon oxidizing bacterium previously designated Micrococcus cerificans, has been shown to sequester the hydrocarbon into intracytoplasmic pools as a result of growth on this substrate. In hydrocarbon grown cells, an intracytoplasmic membrane system was also observed along with a doubling of cellular phospholipids (Z). However, using conventional dehydration and embedding procedures in preparing thin sectioned material, the hydrocarbon is extracted from the cells. This may lead to structural distortion, consequently, the freeze-etch technique was applied to preserve the integrity of the cell.

A potassium permanganate fixative for membranes in sections

1990 ◽  
Vol 48 (3) ◽  
pp. 722-723
Author(s):  
Jindan Song
Keyword(s):  
Potassium Permanganate ◽  
Cultured Cells ◽  
Calf Serum ◽  
Trisodium Citrate ◽  
Membrane System ◽  
Adenocarcinoma Cell Line ◽  
Mouse Embryo Fibroblast ◽  
African Green Monkey Kidney ◽  
Adenocarcinoma Cell ◽  
Green Monkey

Potassium permanganate has been used as a fixative for the botanical specimen and membrane system in thin section by Glauert (1975). A new potassium permanganate fixative ( Trisodium citrate 60mM, Potassium chloride 25mM, Magnesium chloride 35mM, and Potassium permanganate 125mM ) for localizing membranous system in whole_mount cultured cells with standard trasmission electron microscopy and phase_contrast microscopy has been developed). Here, we report that using this new potassium permanganate fixative for membranous system in sections.Cultured cells, CV_1 (African green monkey kidney epithelial cells), Balb/c 3T3 ( Mouse embryo fibroblast ) and MCF_7 (Human adenocarcinoma cell line) were used for this study. All cells were grown on 35mm plastic dishes in DME medium containing 5% calf serum at 37 c with 100% humidity and 5% CO2. Using the potassium permanganate fixative to fix the cells for about 7 minutes. After fixation, the cells were dehydrated in a graded series of ethanol.

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

Methods and specimens for comparative investigations of fatigue resistance of parts with multilayer surfacing

2019 ◽  
Vol 2019 (2) ◽  
pp. 36-42
Author(s):  
I.A. Ryabtsev ◽  
◽  
V.V. Knysh ◽  
A.A. Babinets ◽  
S.A. Solovej ◽  
...  
Keyword(s):  
Fatigue Resistance

HAYNES ALLOY No. 625SQ

Alloy Digest ◽  
2003 ◽  
Vol 52 (8) ◽  
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Heat Treating ◽  
Temperature Performance ◽  
Haynes Alloy

Abstract Haynes 625SQ alloy is a modification of Haynes 625 alloy (see Alloy Digest Ni-354, January 1988) with tighter controls on chemistry and a finer grain size for fatigue resistance up to 680 deg C (1250 deg F). This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance as well as heat treating. Filing Code: Ni-612. Producer or source: Haynes International Inc.

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