Energy Changes In a Stressed Unbounded Matrix Containing a Inhomogeneity Due to Formation of a Non-perfect Interface

2013 ◽  
Vol 185 (1-2) ◽  
pp. 217-224
Author(s):  
M.A. Kattis ◽  
N. Karalis ◽  
E. Gkouti
Keyword(s):  
Perfect Interface

scholarly journals MATHEMATICAL MODELLING AND COMPUTER SIMULATION OF TEMPERATURE DISTRIBUTION IN INHOMOGENEOUS COMPOSITE SYSTEMS WITH IMPERFECT INTERFACE

2014 ◽  
Vol 6 (2) ◽  
pp. 77-85
Author(s):  
Pratibha Joshi ◽  
Manoj Kumar
Keyword(s):  
Numerical Simulation ◽  
Heat Flux ◽  
Temperature Distribution ◽  
Imperfect Interface ◽  
Immersed Interface Method ◽  
Immersed Interface ◽  
Composite Systems ◽  
Steady State Temperature ◽  
Perfect Interface ◽  
Inhomogeneous Composite

Many studies have been done previously on temperature distribution in inhomogeneous composite systems with perfect interface, having no discontinuities along it. In this paper we have determined steady state temperature distribution in two inhomogeneous composite systems with imperfect interface, having discontinuities in temperature and heat flux using decomposed immersed interface method and performed the numerical simulation on MATLAB.

Effective Thermal Conductivity of Functionally Graded Particulate Nanocomposites With Interfacial Thermal Resistance

2008 ◽  
Vol 75 (5) ◽  
Author(s):  
H. M. Yin ◽  
G. H. Paulino ◽  
W. G. Buttlar ◽  
L. Z. Sun
Keyword(s):  
Thermal Conductivity ◽  
Thermal Resistance ◽  
Effective Thermal Conductivity ◽  
Functionally Graded ◽  
Interfacial Thermal Resistance ◽  
Conductivity Distribution ◽  
Consistent Model ◽  
The Matrix ◽  
Graded Material ◽  
Perfect Interface

By means of a fundamental solution for a single inhomogeneity embedded in a functionally graded material matrix, a self-consistent model is proposed to investigate the effective thermal conductivity distribution in a functionally graded particulate nanocomposite. The “Kapitza thermal resistance” along the interface between a particle and the matrix is simulated with a perfect interface but a lower thermal conductivity of the particle. The results indicate that the effective thermal conductivity distribution greatly depends on Kapitza thermal resistance, particle size, and degree of material gradient.

Coupled Extensional and Flexural Motions of a Two-Layer Plate With Interface Slip

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Peng Li ◽  
Feng Jin ◽  
Weiqiu Chen ◽  
Jiashi Yang
Keyword(s):  
Plate Theory ◽  
Cutoff Frequency ◽  
Great Influence ◽  
Imperfect Interface ◽  
Mindlin Plate ◽  
Finite Plate ◽  
Mindlin Plate Theory ◽  
Interface Elasticity ◽  
Propagating Shear ◽  
Perfect Interface

The effect of imperfect interface on the coupled extensional and flexural motions in a two-layer elastic plate is investigated from views of theoretical analysis and numerical simulations. A set of full two-dimensional equations is obtained based on Mindlin plate theory and shear-slip model, which concerns the interface elasticity and tangential discontinuous displacements across the bonding imperfect interface. Some numerical examples are processed, including the propagation of straight-crested waves in an unbounded plate, the buckling of a finite plate, as well as the deflection of a finite plate under uniform load. It is revealed that the bending-evanescent wave in the composites with a perfect interface eventually cuts-on to a propagating shear-like wave with cutoff frequency when the two sublayers imperfectly bonded. The similar phenomenon has been verified once again for coupled face-shear and thickness-shear waves. It also has been pointed out that the interfacial parameter has a great influence on the performance of static buckling, in which the outcome can be reduced to classical buckling load of a simply supported plate when the interface is perfect.

An Edge Dislocation in a Three-Phase Composite Cylinder Model With a Sliding Interface

2002 ◽  
Vol 69 (4) ◽  
pp. 527-538 ◽  
Author(s):  
X. Wang ◽  
Y.-p. Shen
Keyword(s):  
Edge Dislocation ◽  
Arbitrary Point ◽  
Circular Inclusion ◽  
Composite Cylinder ◽  
Phase Form ◽  
Sliding Interface ◽  
Three Phase ◽  
Cylinder Model ◽  
The Matrix ◽  
Perfect Interface

An exact elastic solution is derived in a decoupled manner for the interaction problem between an edge dislocation and a three-phase circular inclusion with circumferentially homogeneous sliding interface. In the three-phase composite cylinder model, the inner inclusion and the intermediate matrix phase form a circumferentially homogeneous sliding interface, while the matrix and the outer composite phase form a perfect interface. An edge dislocation acts at an arbitrary point in the intermediate matrix. This three-phase cylinder model can simultaneously take into account the damage taking place in the circumferential direction at the inclusion-matrix interface and the interaction effect between the inclusions. As an application, we then investigate a crack interacting with the slipping interface.

scholarly journals Examination of car navigation systems and UX designs – suggestion for a new interface

2019 ◽  
Vol 2 ◽  
pp. 1-7
Author(s):  
Fanni Vörös ◽  
Zoltán Tompos ◽  
Béla Kovács
Keyword(s):  
User Interface ◽  
Statistical Tests ◽  
Navigation Systems ◽  
Amount Of Information ◽  
Design Planning ◽  
The Right ◽  
Perfect Interface ◽  
Car Navigation

<p><strong>Abstract.</strong> The need for car-related navigation and the appearance of the vehicles themselves are much the same age – of course. In the early days, paper maps and personal questioning were solved this problem. Nearly 100 years ago, the first built-in car GPS was released – and this is an innovation that is still an important part of car design. Planning the user interface is a very exciting issue, because only in a few seconds the display needs to provide the user with the right amount of information. In this research our goal was to assess Hungarians driving and built-in GPS using habits and based on this try to suggest the “perfect” interface. A questionnaire was made with 19 or 46 questions and more than 1000 respondents completed it. Because of the high number of questions only selected diagrams are represented. Some answers have also been subjected to different statistical tests.</p>

Modified Stoney's Formulas for Small-Scaled Bilayer Systems

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Dongying Liu ◽  
Weiqiu Chen
Keyword(s):  
Couple Stress ◽  
Couple Stress Theory ◽  
Modified Couple Stress Theory ◽  
Imperfect Interface ◽  
Bilayer Film ◽  
Type Model ◽  
Stress Theory ◽  
Modified Couple Stress ◽  
Film Substrate ◽  
Perfect Interface

The mechanics of a small-scaled bilayer film-substrate system subject to temperature variation is studied. The modified couple stress theory is employed to take account of the size effects that are usually observed in small-scaled structures. In addition, the effect of weak bonding between the film and substrate is examined by using a linear slip-type model. Exact solutions are derived and the closed-form expressions for residual thermal stress and curvature of the system are given. Modified Stoney’s formulas are also presented for the bilayer system with perfect interface or imperfect interface between the film and the substrate.

Interface Of Aluminum/Ceramic Power Substrates Manufactured By Casting-Bonding Process

1996 ◽  
Vol 445 ◽  
Author(s):  
X. S. Ning ◽  
Y. Ogawa ◽  
K. Suganuma
Keyword(s):  
Thermal Stress ◽  
Stress Tolerance ◽  
High Reliability ◽  
Bonding Process ◽  
Power Devices ◽  
Power Modules ◽  
Conventional Technology ◽  
Bonding Method ◽  
Perfect Interface

AbstractNew processes for manufacturing Al/ceramic power substrates have been developed. These processes use a casting-bonding method to bond Al plates to the both sides of ceramic plates. The Al plates formed on the substrates are then chemically etched to be a desired shape using the conventional technology, followed by plating nickel on them. The power substrates manufactured by the process have both a perfect interface and an excellent thermal stress tolerance. Hence, these processes are especially suitable for assembling high reliability power devices such as IGBT power modules.

Self-Consistent Model of Laminated Composites

2010 ◽  
Author(s):  
Yiguo Zhu ◽  
Dan Zhao ◽  
Ping Hu
Keyword(s):  
Laminated Composites ◽  
Interface Condition ◽  
Stress And Strain ◽  
Plane Part ◽  
Consistent Model ◽  
Self Consistent ◽  
Out Of Plane ◽  
Compliance Matrices ◽  
Analytical Expressions ◽  
Perfect Interface

A self-consistent model of laminated composites was constructed. In the model, macroscopic and microscopic stress and strain were divided into two parts, one was In-plane part and the other was Out-of-plane part, then the stiffness and compliance matrices could be partitioned. By using the definitions of macroscopic stress and strain and perfect interface condition, one could get the analytical expressions of macroscopic stiffness and compliance of two-layer composites. Macroscopic stiffness and compliance of multilayer composites could be gotten based on the analytical expressions. The reciprocal property of the stiffness and compliance matrices could be proved by numerical tests and theoretical analysis.

scholarly journals Metal Fibre Reinforced Composite – Potentialities and Tasks

2009 ◽  
Vol 18 (2) ◽  
pp. 096369350901800 ◽  
Author(s):  
S. Schmeer ◽  
M. Steeg ◽  
M. Maier ◽  
P. Mitschang
Keyword(s):  
Mechanical Properties ◽  
Compression Molding ◽  
Sem Analysis ◽  
Absorbed Energy ◽  
Steel Fibres ◽  
Reinforced Composite ◽  
Temperature And Pressure ◽  
Perfect Interface ◽  
Pressure Controlled ◽  
Material Tests

Steel fibres and Twintex® materials were prepared by compaction with a continuous compression molding press, equipped with temperature and pressure controlled plates. The material itself was observed by SEM analysis and mechanical properties were examined by different material tests. In spite of a non perfect interface and bonding the mechanical properties such as stiffness and strength were increased by adding steel fibres to Twintex® material. Even the specific values of stiffness and absorbed energy could be enhanced considerably.

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