scholarly journals Determination of Internal Stresses in Lightweight Metal Matrix Composites

10.5772/36412 ◽  
2012 ◽  
Author(s):  
Guillermo Requena ◽  
Gerardo Garcs ◽  
Ricardo Fernndez ◽  
Michael Schbel
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Internal Stresses ◽  
Matrix Composites

Thermally induced dislocation generation in Al/Al2O3 metal-matrix composites

1991 ◽  
Vol 49 ◽  
pp. 588-589
Author(s):  
Kenneth S. Vecchio
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Internal Stresses ◽  
Frictional Stress ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Dislocation Loops ◽  
Thermally Induced ◽  
The Matrix ◽  
Induced Dislocation

It has been well documented that when a large difference in the coefficients of thermal expansion (CTE) exist between the matrix and reinforcement in metal-matrix composites (MMCs) internal stresses can develop which are sufficiently high to generate dislocations at the reinforcement/matrix interface. Numerous observations have been made of this phenomenon via TEM which have shown a variety of different dislocation substructures and dislocation punching mechanisms. An important consequence of this phenomenon is that the metal matrix becomes strain hardened as the dislocation density increases, thereby reducing subsequent plastic flow of the matrix. One notable feature of the dislocation punching mechanism is that prismatic dislocation loops are commonly observed emanating from the interface. In two recent studies it was found that dislocations were not emitted immediately upon cooling, but rather at some lower critical temperature. A number of microstructural and processing parameters can affect the thermally-induced dislocation substructure such as: a) differences in CTEs, b) lattice frictional stress, c) vol.% particulate, d) particle/matrix interface morphology, e) quench temperatures (ΔT effect), and f) thermal-cycling (e.g. reheating and requenching).

Modelling and determination of dynamic elastic modulus of magnesium based metal matrix composites

2000 ◽  
Vol 16 (3) ◽  
pp. 309-314 ◽  
Author(s):  
N. Srikanath ◽  
D. Saravanaranganathan ◽  
M. Gupta ◽  
L. Lu ◽  
M.O. Lai
Keyword(s):  
Elastic Modulus ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Dynamic Elastic Modulus ◽  
Matrix Composites

A Computational Approach for the Constitutive Modeling of Elastoplastic Behavior of Metal Matrix Composites

2016 ◽  
Vol 14 (05) ◽  
pp. 1750058 ◽  
Author(s):  
M. U. Siddiqui ◽  
Abul Fazal M. Arif
Keyword(s):  
Composite Materials ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Three Dimensional ◽  
Constitutive Models ◽  
Computational Approach ◽  
Matrix Composites ◽  
Elastoplastic Behavior ◽  
Alumina Composite

Computational homogenization provides an excellent tool for the design of composite materials. In the current work, a computational approach is presented that is capable of estimating the elastic and rate-independent plastic constitutive behavior of metal matrix composites using finite element models of representative volume elements (RVEs) of the composite material. For this purpose, methodologies for the generation of three-dimensional computational microstructures, size determination of RVEs and the homogenization techniques are presented. Validation of the approach is carried out using aluminum–alumina composite samples prepared using sintering technique. Using the homogenized material response, effective constitutive models of the composite materials have been determined.

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