New approach to predict the micromechanical behavior of a multiphase composite material

2014 ◽  
Vol 8 ◽  
pp. 869-873
Author(s):  
EL Guesse ◽  
M.O. Bensalah ◽  
A. Ettouhami ◽  
O. Fassi Fehri
Keyword(s):  
Composite Material ◽  
New Approach ◽  
Multiphase Composite

Thermal Expansion Behavior of the Multiphase Composite System

2004 ◽  
Vol 449-452 ◽  
pp. 765-768
Author(s):  
Chong Sung Park ◽  
Hyun Seok Hong ◽  
Myung Ho Kim ◽  
Chong Mu Lee
Keyword(s):  
Thermal Expansion ◽  
Composite System ◽  
Welding Process ◽  
High Volume ◽  
Volume Percent ◽  
New Approach ◽  
Composite Systems ◽  
Expansion Behavior ◽  
The Matrix ◽  
Multiphase Composite

A new approach for the CTE on the basis of Ashelby.s cutting and welding process was made for the analysis of the thermal expansion behaviors of Al-Si alloys and composites. In this theoretical approach, it was considered that relaxation of residual stress could create an elastoplastic zone in the matrix around a particle during cooling. A comparison of the measured CTEs with the calculated ones for the Al-Si-SiCp and Al-Si-Al2O3 composite systems was performed in terms of the volume percent and the size of reinforced phases. The calculated results revealed that the linear CTE of the both composite depends on the size of the reinforce phases, especially at the composite systems with a low volume percent of the reinforce phases. The increase in the volume percentages of Al2O3, SiCp and Si phase lowers the linear CTEs of the systems. The measured CTEs was deviated less than about ten percents from the calculated ones at composites with a high volume percent. The deviations of the CTEs of reinforced phases are about 4 - 6 vol% from real composite systems.

scholarly journals Design of a Low-Cost Easy-to-Fly STOL Ultralight Aircraft in Composite Material

10.14311/744 ◽  
2005 ◽  
Vol 45 (4) ◽  
Author(s):  
D. P. Coiro ◽  
A. de Marco ◽  
F. Nicolosi ◽  
N. Genito ◽  
S. Figliolia
Keyword(s):  
Composite Material ◽  
Numerical Calculation ◽  
Optimization Algorithm ◽  
Low Cost ◽  
Market Survey ◽  
Integration Technique ◽  
High Lift ◽  
Detailed Design ◽  
New Approach ◽  
Wing Folding

The paper deals with the design of an aircraft, starting from a market survey, the conceptual design loop and the preliminary choice of dimensions, and leading to the detailed design of efficient high-lift systems and a low-drag fuselage shape. Technological challenges regarding the design of low-cost systems for flap/slat retraction and a simple wing folding system are highlighted. Aiming at an efficient optimization algorithm, we developed a new integration technique between CAD, aerodynamic and structural numerical calculation. Examples deriving from this new approach are presented. 

scholarly journals Investigation on the transport properties of chlorides in concrete (I) Identification of ITZ

2018 ◽  
Vol 199 ◽  
pp. 02013
Author(s):  
Tian Ye ◽  
Jin Xianyu ◽  
Jin Nanguo
Keyword(s):  
Composite Material ◽  
Normal Distribution ◽  
Electron Microprobe ◽  
Concentration Distribution ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Chloride Ions ◽  
Interfacial Transition Zone ◽  
Ions Transport ◽  
Multiphase Composite

Concrete is a multiphase composite material, in which the mortar, aggregate and interfacial transition zone (ITZ) have important influence on the chloride ions transport. In this research, the thickness ITZ was measured and the concentration distribution of chloride ions in concrete was obtained through electron microprobe analysis. The experiment results that the thickness of ITZ follows a normal distribution and the size of aggregate shows no clear influence on the thickness of ITZ.

ELASTIC PLASTIC PROPERTIES OF MULTIPHASE COMPOSITE BASED ON NON HOMOGENEOUS METAL MATRIX – MODELLING AND SIMULATION

2013 ◽  
Vol 43 (4) ◽  
pp. 49-60
Author(s):  
Ludmila Parashkevova ◽  
Nikolina Bontcheva
Keyword(s):  
Precipitation Hardening ◽  
Volume Element ◽  
Plastic Properties ◽  
New Approach ◽  
Self Consistent ◽  
Consistent Method ◽  
Micropolar Media ◽  
Matrix Modelling ◽  
Rapidly Solidified ◽  
Multiphase Composite

Abstract A new approach for estimating the mechanical properties of multiphase composite is proposed. The Representative Volume Element (RVE) of the material consists of two different metal matrices and arbitrary number of elastic hardening phases. Multistep homogenization procedures are applied, accounting for influence of the constituent properties, sizes, volume fractions and microstructural distributions. Modified Mori-Tanaka homogenization technique for micropolar media and Budiansky self-consistent method are used for estimation the overall properties of the composite. The theoretical model is applied to description of the properties of precipitation hardening rapidly solidified alloy of the system AlFeVSi with high content of Fe and Si.

Advanced Composites for LIDAR Applications

2005 ◽  
Vol 883 ◽  
Author(s):  
Witold Kowbel ◽  
Jim Withers ◽  
Rigel Woida
Keyword(s):  
Thermal Conductivity ◽  
Fracture Toughness ◽  
Composite Material ◽  
Thermal Management ◽  
Laser Diodes ◽  
Current Generation ◽  
New Approach ◽  
Advanced Composites ◽  
Novel Technology ◽  
Graphite Foam

AbstractThe current generation of laser diodes suffers from poor thermal management. Typically, Cu-W is used as a submount material. Although it offers a good CTE match with GaAs, thermal conductivity is very limited (160 W/mK). A new approach to improving the thermal management of laser diodes was developed involving the use of hybrid CC/graphite foam composites.We also have a novel technology developed for LIDAR optical structures consisting of SiC-SiC composite material which exhibits excellent fracture toughness and homogeneous CTE.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

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