Analysis of Lattice Single Layer Cylindrical Structures

1987 ◽  
Vol 2 (2) ◽  
pp. 87-91 ◽  
Author(s):  
Istvan HegedüS
Keyword(s):  
Stress Distribution ◽  
Matrix Method ◽  
Regular Ring ◽  
Lattice Structure ◽  
Single Layer ◽  
Cylindrical Structures ◽  
Lattice Construction

A matrix method is presented for the calculation of bar forces in a single layer lattice cylinder composed of regular ring polygons and symmetrically arranged bracing bars. Substantial differences occur between the stress distribution in the lattice structure and that of the membrane cylinder under the same load. Therefore, a membrane cylinder cannot be considered as a replacement continuum for the lattice construction. The purpose of the paper is to draw attention to the danger in the utilisation, without due caution, of this analogy.

Optimization of Orthotropic Laminates

1967 ◽  
Vol 89 (3) ◽  
pp. 399-402 ◽  
Author(s):  
L. Fischer
Keyword(s):  
Stress Distribution ◽  
Structural Design ◽  
Single Layer ◽  
Design Criteria ◽  
Shear Stresses ◽  
Stress Strain ◽  
Mathematical Procedure ◽  
Optimum Structural Design ◽  
Interaction Equation

Stress-strain relationships for a single layer are used to obtain the stress distribution in a laminate composed of any number of orthotropic layers subjected to axial and shear stresses. The mathematical procedure is simplified for an isotropic laminate. An interaction equation is presented to predict failure of a laminate. Optimum structural design criteria are obtained by considering different combinations of layer orientations.

Simulation Study of the Whole Process of Collapse and Collision of a Large-Span Steel Single-Layer Lattice Structure

2011 ◽  
Vol 308-310 ◽  
pp. 2368-2373
Author(s):  
Dong Ya An ◽  
Cheng Ming Li
Keyword(s):  
Performance Analysis ◽  
Lattice Structure ◽  
Single Layer ◽  
Large Earthquake ◽  
Structural Safety ◽  
The Sun ◽  
Displacement Effect ◽  
Large Span ◽  
Whole Process ◽  
Earthquake Action

The project Expo Axis is one of the landmark buildings of Expo Shanghai 2010, and its structural safety depends largely on the security of the six Sun Valleys, which are the important components of the Expo Axis. The simulation of the whole process of collapse and collision of the sun valley under earthquake action is conducted in this article. In the calculation multiple nonlinear factors are taken into account, such as material nonlinearity, large displacement effect, self-contact collision among the structure members, contact collision between the structure and the ground, etc. Through analyzing the results, a reasonable assessment of the structure of Sun Valley’s performance under the supper-large earthquake is given out. This method can also offer reference to other similar large-span steel single-layer lattice structure’s performance analysis.

Configurations of Single-Layer Barrel Vaults

2001 ◽  
Vol 4 (2) ◽  
pp. 53-64 ◽  
Author(s):  
Ahmed El-Sheikh
Keyword(s):  
Stress Distribution ◽  
Aspect Ratio ◽  
Boundary Conditions ◽  
Failure Mechanisms ◽  
Single Layer ◽  
Radius Of Curvature ◽  
Weight Value ◽  
Joint Rigidity ◽  
Barrel Vaults

Single-layer barrel vaults with one radius of curvature may be fabricated with several common grid configurations. With different configurations, the vault' s performance and aesthetics vary considerably affecting both its competitiveness and suitability for different applications. The study presented in this paper is an assessment of the most commonly adopted vault configurations and their effect on the vault stiffness/weight value, member stress distribution, number, length and weight of members, degree of statical redundancy, resistance to failure mechanisms, reliance on joint rigidity and cost. The study is parametric and covers wide variations of the vault aspect ratio, span/rise ratio and boundary conditions. The results of this study should be of significant value to the design of future barrel vault structures.

Analytical and Numerical Modelling of Interfacial Stress Distribution of a Piezoresistive Coating Layer

2021 ◽  
Author(s):  
Adekunle Sulaimon Ogunbadejo ◽  
André McDonald ◽  
Sanjeev Chandra
Keyword(s):  
Stress Distribution ◽  
Coating Layer ◽  
Single Layer ◽  
Interfacial Stress ◽  
Insulating Layer ◽  
Thermally Sprayed Coatings ◽  
Thermally Sprayed ◽  
Monitoring Devices ◽  
Sprayed Coatings ◽  
Layer Coating

Abstract Thermally sprayed coatings can be used in structural health monitoring devices where the coatings can reveal defects in the real-time integrity of the component through changes in mechanical, thermal or modal properties during service. In this emerging application, the mechanical properties of the coating are strongly affected by the interfacial bond between the coating and the substrate. This paper presents an analytical study of the interfacial stress distribution based on piezoresistive-stress constitutive relation of a coating layer. Both a single layer coating- and a bilayer coating-substrate system were considered. An analytical solution of the interfacial stress was developed by solving a Fredholm-Volterra singular integro-differential equation of a coating-substrate model using Chebyshev polynomials. Numerical simulation was conducted to analyze the effects of geometric and effective material properties of the coating-substrate system on the interfacial stress distribution. It was found that the susceptibility of the piezoresistive layer to delamination primarily relies on thicknesses of the coating layers and the stiffness of the intermediary insulating layer and substrate.

Analysis of Cord-Reinforced Poly-Rib Serpentine Belt Drive With Thermal Effect

2005 ◽  
Vol 127 (6) ◽  
pp. 1198-1206 ◽  
Author(s):  
G. Song ◽  
K. Chandrashekhara ◽  
W. F. Breig ◽  
D. L. Klein ◽  
L. R. Oliver
Keyword(s):  
Stress Distribution ◽  
Contact Stress ◽  
Three Dimensional ◽  
Single Layer ◽  
Material Model ◽  
Element Model ◽  
Shear Angle ◽  
Velocity Variation ◽  
Serpentine Belt ◽  
Contact Stress Distribution

This paper investigates the operation of an automotive poly-rib serpentine belt system. A three-dimensional dynamic finite element model, consisting of a driver pulley, a driven pulley, and a complete five-rib V-ribbed belt, was created. Belt construction accounts for three different elastomeric compounds and a single layer of reinforcing cords. Rubber was considered incompressible hyperelastic material, and cord was considered linear elastic material. The material model accounting for thermal strains and temperature-dependent properties of the rubber solids was implemented in ABAQUS∕EXPLICIT code for the simulation. A tangential shear angle and an axial shear angle were defined to quantify shear deformations. The shear angles were found to be closely related to velocity variation along contact arc and the imbalanced contact stress distribution on different sides of the same rib and on different ribs. The temperature effect on shear deformation, tension and velocity variation, and contact stress distribution was investigated and shown in comparison to the results for the same system operating at room temperature.

A Matrix Method for Optimizing a Neural Network

1991 ◽  
Vol 3 (3) ◽  
pp. 450-459 ◽  
Author(s):  
Simon A. Barton
Keyword(s):  
Neural Network ◽  
Matrix Method ◽  
Single Layer ◽  
Test Problems ◽  
Functional Representation ◽  
Iterative Minimization ◽  
Minimization Procedure ◽  
Input Side ◽  
Output Side ◽  
Hidden Layer

A matrix method is described that optimizes the set of weights and biases for the output side of a network with a single hidden layer of neurons, given any set of weights and biases for the input side of the hidden layer. All the input patterns are included in a single optimization cycle. A simple iterative minimization procedure is used to optimize the weights and biases on the input side of the hidden layer. Many test problems have been solved, confirming the validity of the method. The results suggest that for a network with a single layer of hidden sigmoidal nodes, the accuracy of a functional representation is reduced as the nonlinearity of the function increases.

scholarly journals High Performance Hybrid Graphene Nano Filters as a Total dissolved solid remover

2021 ◽  
Vol 3 (2) ◽  
pp. 177-181
Author(s):  
Renuka Sharma ◽  
Pratyush Shekhar
Keyword(s):  
Graphene Oxide ◽  
Metal Oxides ◽  
High Performance ◽  
Lattice Structure ◽  
Single Layer ◽  
Inorganic Membrane ◽  
Wide Range ◽  
Graphene Derivatives ◽  
Ph Level ◽  
Total Dissolved Solid

Graphene, a single-layer carbon sheet with its distinctive two-dimensional (2D) single-atomic-thick sp2 hybridized hexagonal packed lattice structure which is nearly friction less with high chemical inertness, and pliability which can be manufactured sustainably in great amounts with less expense, has shown many unique properties, Graphene has attracted tremendous research interest in recent years, owing to its exceptional properties. The scaled-up and reliable production of graphene derivatives, such as graphene oxide (GO) and reduced graphene oxide (GO), offers a wide range of possibilities to produce nano-filters containing graphene membrane which is capable to remove ninety percent of the heavy contaminants from different sources of water and to reduce the level of total dissolved solids, salinity, and neutralizes the pH level further inorganic membrane used in synergism with graphene oxide shows improved efficiency and reduction in cost of production of separation membranes. In this review, we demonstrated real world application of graphene, Fabricated with Several Metal Oxides in synergism to illustrate enhanced photocatalysis properties, Flexural strength and anti-fouling characteristics of the material in comparisons to conventional membrane, photocatalytic metal oxides nanoparticles such as Titania TiO2, Zirconia ZrO2, Alumina Al2O3, and Silica SiO2 functions in the presence of Multiple Spectrums of Light by absorbing photons and releasing Oxygen Radical which degrades harmful water pollutants into less harmful substances.

scholarly journals Purification of marginal plates from bovine renal peroxisomes: identification with L-alpha-hydroxyacid oxidase B.

1991 ◽  
Vol 113 (1) ◽  
pp. 113-121 ◽  
Author(s):  
K Zaar ◽  
A Völkl ◽  
H D Fahimi
Keyword(s):  
Lattice Structure ◽  
Single Layer ◽  
Urate Oxidase ◽  
Crystalline Lattice ◽  
Additional Information ◽  
Cell Tissue ◽  
Sds Page ◽  
The Matrix ◽  
Marginal Plates

The matrix of mammalian peroxisomes frequently contains crystalline inclusions. The most common inclusions are membrane associated plate-like "marginal plates" of hitherto unknown nature in renal peroxisomes and central polytubular "cores" composed of urate oxidase in hepatic peroxisomes. In bovine kidney, peroxisomes of proximal tubules exhibit peculiar angular shapes that are caused by multiple marginal plates (Zaar, K., and H.D. Fahimi. 1990. Cell Tissue Res. 260:409-414). Enriched or highly purified peroxisome preparations from this source were used to purify and characterize marginal plates. By SDS-PAGE, one major polypeptide of Mr 33,500 was observed that corresponded to the marginal plate protein. This polypeptide was identified by its enzymatic activity as well as by immunoblotting and preembedding immunocytochemistry as the isozyme B of L-alpha-hydroxyacid oxidase (EC 1.4.3.2). Morphologically, marginal plates were revealed to consist of rectangular straight-edged sheets, exhibiting a defined crystalline lattice structure. The sheets apparently are composed of a single layer of protomers which associate laterally to form a plate-like structure. As deduced from the negative staining results and the additional information of the thickness of marginal plates, each protomer seems to consist of eight subunits forming a cube-like array. The tendency of L-alpha-hydroxyacid oxidase B to self-associate in vitro (Philips, D.R., J.A. Duley, D.J. Fennell, and R.S. Holmes. 1976. Biochim. Biophys. Acta. 427:679-687) corresponds to the mode of association of cubical protomers to form the so-called marginal plates in renal peroxisomes.

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