Comparisons between three-dimensional and two-dimensional multi-particle unit cell models for particle reinforced metal matrix composites

2001 ◽  
Vol 9 (2) ◽  
pp. 47-65 ◽  
Author(s):  
H J Böhm ◽  
W Han
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Three Dimensional ◽  
Unit Cell ◽  
Matrix Composites ◽  
Two Dimensional ◽  
Cell Models

Numerical Simulations for Uniaxial Ratcheting of SiCP/6061Al Composites Concerning Particulate Arrangement

2007 ◽  
Vol 26-28 ◽  
pp. 317-320 ◽  
Author(s):  
Su Juan Guo ◽  
Guo Zheng Kang ◽  
Cheng Dong
Keyword(s):  
Metal Matrix ◽  
Cell Model ◽  
Three Dimensional ◽  
Unit Cell ◽  
Matrix Composites ◽  
Finite Element Code ◽  
Unit Cell Model ◽  
Cell Models ◽  
User Material Subroutine ◽  
Particulate Reinforced

Based on three dimensional cubic unit cell models containing several particulates with certain particulate arrangements, the monotonic tensile and uniaxial ratcheting behaviors of particulate reinforced metal matrix composites (i.e., T6-treated SiCP/6061Al composites) were numerically simulated by using elastic-plastic finite element code ABAQUS with help of newly developed user material subroutine (UMAT). In the simulations, the effects of different particulate arrangements inside the unit cell models on the monotonic tensile and ratcheting behaviors of the composites were discussed. It is shown that the effect of particulate arrangement on the ratcheting of the composite depends on the arranged modes and the number of particulates contained in the model, and the interaction between particulates can be represented reasonably by the cubic unit cell model with a suitable distribution of multi-particulates.

Finite Element Modeling for Prediction of Residual Stresses in Fiber Reinforced Metal Matrix Composites

1993 ◽  
Author(s):  
Partha Rangaswamy ◽  
N. Jayaraman
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Residual Stresses ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Material ◽  
Unit Cell ◽  
Experimental Results ◽  
Matrix Composites ◽  
Layer Removal

Abstract In metal matrix composites residual stresses developing during the cool-down process after consolidation due to mismatch in thermal expansion coefficients between the ceramic fibers and metal matrix have been predicted using finite element analysis. Conventionally, unit cell models consisting of a quarter fiber surrounded by the matrix material have been developed for analyzing this problem. Such models have successfully predicted the stresses at the fiber-matrix interface. However, experimental work to measure residual stresses have always been on surfaces far away from the interface region. In this paper, models based on the conventional unit cell (one quarter fiber), one fiber, two fibers have been analyzed. In addition, using the element birth/death options available in the FEM code, the surface layer removal process that is conventionally used in the residual stress measuring technique has been simulated in the model. Such layer removal technique allows us to determine the average surface residual stress after each layer is removed and a direct comparison with experimental results are therefore possible. The predictions are compared with experimental results of an eight-ply unidirectional composite with Ti-24Al-11 Nb as matrix material reinforced with SCS-6 fibers.

Characterization of Metal Matrix Composites by Synchrotron Refraction Computed Topography

2010 ◽  
Vol 638-642 ◽  
pp. 967-972
Author(s):  
Bernd R. Müller ◽  
Axel Lange ◽  
M. Harwardt ◽  
M.P. Hentschel
Keyword(s):  
Computed Tomography ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
High Performance ◽  
Three Dimensional ◽  
Matrix Composites ◽  
X Rays ◽  
X Ray ◽  
Surface And Interface ◽  
Federal Institute

X-ray computed tomography is an important tool for evaluating the three dimensional microstructure of modern materials non-destructively. To resolve material structures in the micrometre range and below high brilliance synchrotron radiation has to be taken. But materials of low absorption or mixed phases show a weak absorption contrast at there interfaces. A Contrast enhancement can be achieved by exploiting the refraction of X-rays at interfaces. This technique was developed and applied at the NDT department of the Federal Institute for Materials Research and Testing (BAM) during the last decade. It meets the actual demand for improved non-destructive characterisation of high performance composites, ceramics and other low density materials and components. The technique is based on Ultra Small Angle Scattering (USAXS) by micro structural elements causing phase related effects like refraction and total reflection at a few minutes of arc as the refractive index of X-rays is nearly unity. The extraordinary refraction contrast of inner surfaces is far beyond absorption effects and hence especially useful for materials of low absorption or mixed phases, showing similar X-ray absorption properties. Crack orientation and fibre-matrix debonding in plastics, polymers, ceramics and metal-matrix-composites after cyclic loading and hydro thermal aging can be visualized. By combining the refraction technique with the computed tomography technique the three dimensional imaging of the micro structure of the materials is obtained. In most cases the investigated inner surface and interface structures correlate to mechanical properties. Recent results with a sub-micrometer resolution will be presented.

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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