Comparison of Crystal Plasticity and Isotropic Hardening Predictions for Metal-Matrix Composites

1993 ◽  
Vol 60 (1) ◽  
pp. 70-76 ◽  
Author(s):  
A. Needleman ◽  
V. Tvergaard
Keyword(s):  
Volume Fraction ◽  
Matrix Material ◽  
Isotropic Hardening ◽  
Slip Systems ◽  
Matrix Composites ◽  
Plastic Deformations ◽  
Crystalline Plasticity ◽  
Planar Crystal ◽  
Crystal Model ◽  
Flow Theory Of Plasticity

In a numerical micromechanical study of the tensile properties of a metal reinforced by short whiskers, the elastic-plastic deformations of the metal are described in terms of crystalline plasticity, using a planar crystal model that allows for either two or three slip systems. Plane strain analyses are carried out for a periodic array of aligned whiskers for whisker volume fractions of 10 percent to 30 percent, and comparison is made with predictions based on a corresponding flow theory of plasticity with isotropic hardening. The predicted trend for composite strengthening with whisker volume fraction is the same for the various matrix material constitutive characterizations. It is found that the crystal model can give rise to shear localization, initiating at the sharp whisker edges. As a consequence of this localization, the stress carrying capacity eventually drops.

scholarly journals Extraction of void fraction in metal matrix composite using morphological image processing

1994 ◽  
Vol 3 (2) ◽  
pp. 096369359400300
Author(s):  
Lun X. He ◽  
David K. Hsu ◽  
John P. Basart
Keyword(s):  
Image Processing ◽  
Void Fraction ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Matrix Material ◽  
Void Content ◽  
Matrix Composites ◽  
Cross Sectional ◽  
Morphological Image Processing ◽  
The Matrix

In continuous fiber reinforced metal matrix composites, the volume fraction of voids in the matrix material is an important parameter for material property characterization. In analyzing a cross-sectional micrograph of such a composite, the presence of fiber images and voids occurring on the perimeter of fibers complicates the determination of void content. This paper describes image processing steps using mathematical morphology for the extraction of void fraction in a composite.

Material Flow in Mg-PSZ Particle Reinforced TRIP-Matrix-Composites due to Hot-Rolling

2016 ◽  
Vol 684 ◽  
pp. 97-103 ◽  
Author(s):  
Katja Pranke ◽  
Sergey Guk
Keyword(s):  
Material Flow ◽  
Volume Fraction ◽  
Rolling Force ◽  
True Strain ◽  
Matrix Material ◽  
Rolling Direction ◽  
Base Material ◽  
Linear Structure ◽  
Full Density ◽  
Matrix Composites

The material flow in particle reinforced metal-matrix-composites (MMC) had been investigated. The composite consisted of TRIP steel and magnesium stabilized ZrO2 particles (Mg‑PSZ) in volume fractions of 0 %, 5 % and 20 %. The basic materials were produced by hot-pressing and showed a very homogeneous particle distribution and a almost full density. Then the samples were cut to wedge shape and hot-rolled with a constant roll gap. Caused by the shape, the true strain increased over the length and reached a maximum of true strain of 0.6. The strain rate was set to be higher than 0.1 and lower than 10/ s. After rolling, it was possible to combine rolling force, true strain and the material flow due to the grid on the surface. With an increase in volume fraction of Mg‑PSZ the rolling force increases as well. Metallographic examinations were performed to determine and document the flow of particles within the composite due to true strain conditions. It was found that the particles flow with the base material and turn parallel to the rolling direction. This effect was measured using the degree of orientation of partially oriented linear structure elements Ω12, according to ASTM E 1268-01. The index was increasing with increasing true strain value. Further microscopic examination showed debonding of the interface between particles and matrix-material. For MMC’s having a volume fraction of 20 % Mg-PSZ a true strain at fracture of 0.5 to 0.6 was determined.

Machining of Al/SiCp Metal Matrix Composites at Low Temperature Heating Prior to Machining

2012 ◽  
Vol 197 ◽  
pp. 428-432 ◽  
Author(s):  
Uday Dabade ◽  
Suhas Joshi
Keyword(s):  
Metal Matrix Composites ◽  
Surface Quality ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Matrix Material ◽  
Cutting Tools ◽  
Matrix Composites ◽  
Machined Surface ◽  
Pull Out ◽  
Hot Machining

The utilization of Al/SiCp metal matrix composites in different engineering fields has undergone a tremendous increase due to its tailor-made properties that can be achieved by varying the size and volume fraction of reinforcement. However, the difficulty in machining of metal matrix composites (MMCs) arises not only from the excessive wear of the cutting tools but also from fracturing of the reinforcement particles on machined surfaces that leaves behind adhered particle fragments, pits and cavities. These characteristics in machining of MMCs tend to adversely affect the machined surface quality/integrity. Hence, some attempts are made to improve the machinability of MMCs and surface quality by hot machining using wiper inserts. Experimental results indicate that the moderate heating of Al/SiCp composite material prior to machining (60-90°C) reduces the machining forces and improves the surface quality by minimizing, debonding, fracture and pull-out of reinforcement particles from the matrix material.

Thermal Spray Manufacturing of Semi-Finished Parts for Thixoforming of Fiber and Particle Reinforced Metal Matrix Composites

2006 ◽  
Vol 116-117 ◽  
pp. 375-378 ◽  
Author(s):  
Martin Wenzelburger ◽  
Maria Nieves Alsina ◽  
Konstantin von Niessen ◽  
Rainer Gadow
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Matrix Material ◽  
Ceramic Particle ◽  
Light Metal ◽  
Raw Material ◽  
Processing Temperature ◽  
Matrix Composites ◽  
Semi Solid

Processing of light-metals in semi-solid state offers some advantages regarding process temperatures, handling of the material, but also the resulting micro-structure of the final component. Reinforcement of light-metal components with fibers or particles can be applied in order to increase elastic modulus and yield strength of the material as well as its wear resistance. But, the manufacturing of metal matrix composites by thixoforging requires the supply of raw material that shows thixotropic behavior at processing temperature and that contains a definite volume fraction of well distributed reinforcement phase. In this work, an arc wire spray process is applied for the manufacturing of semi-finished parts by coating of long-fiber fabrics and by deposition of ceramic particle containing billets. The process technique is described and the suitability of thermally sprayed matrix material for semi-solid processing is verified.

Wear Characterization of Aluminium Metal Matrix Composites

2013 ◽  
Vol 22 (4) ◽  
pp. 096369351302200 ◽  
Author(s):  
S. Vijayakumar ◽  
L. Karunamoorthy
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Matrix Material ◽  
Wear Test ◽  
Stir Casting ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Aluminium Metal ◽  
Wear Characterization

Aluminium metal matrix composites wear characterization is presented in the paper. The LM25 grade aluminium alloy is chosen as matrix material and reinforcements are silicon carbide, zircon and garnet particles. AlMMCs are produced by conventional stir casting method and heat treated before making wear test specimens according to the ASTM G99 standards. The wear behaviour of these composites is studied under laboratory conditions using a pin-on-disc wear test rig. The wear behaviour of these composites is studied under sliding on EN32 steel disc. The influence of reinforcement type, volume fraction, particle size, sliding speed, applied load and sliding distance is analyzed.

Optimization of the wear resistance of AA2024 matrix composites fabricated with hot pressing

2016 ◽  
Vol 79 (1) ◽  
pp. 19-23 ◽  
Author(s):  
I. Ovali ◽  
H. Karakoç ◽  
H. Çinici
Keyword(s):  
Wear Resistance ◽  
Hot Pressing ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Matrix Material ◽  
Experimental Result ◽  
Matrix Composites ◽  
Wear Properties ◽  
Mixed Powder ◽  
Steel Mold

Purpose: In the present study, the effects of B4C reinforcement volume fraction (% 5-15-20)on the abrasive wear properties of AA2024 matrix composites produced with hot pressingmethods were investigated.Design/methodology/approach: As-received samples were also used for comparison.AA 2024 powder was mixed with B4C-SiC-Al2O3 particles by a three dimensional mechanicmixer for 30 minutes. Mixed powder was pressed under 60 MPa at room temperature in thesteel mold by unidirectional. Steel mold kept in the furnace at 550ºC after the pre-pressingfor 30 minutes. Samples were pressed in heated mold under 100 Pa. The wear tests werecarried out using a pin-on-disk wear tester by sliding at sliding speeds of 1.2 m/s againstsilicon carbide paper. Normal loads of 10, 20 and 30 N at constant sliding speed at roomtemperature.Findings: The experimental result showed that B4C volume fraction significantly influencethe wear behavior of AA2024 matrix composites produced with hot pressing methods.Originality/value: It was also found that the wear resistance of AA2024 matrix compositesproduced with hot pressing methods increases with increasing B4C volume fraction.The highest weight loss was obtained in the unreinforced matrix material.

Preparation of Electron Transparent Metal-Matrix Composites

1968 ◽  
Vol 26 ◽  
pp. 334-335 ◽  
Author(s):  
M. R. Pinnel ◽  
A. Lawley
Keyword(s):  
Stainless Steel ◽  
Load Transfer ◽  
Volume Fraction ◽  
Steel Wire ◽  
Initial Step ◽  
Interfacial Region ◽  
Matrix Composites ◽  
Specific Test ◽  
The Matrix ◽  
The One

Numerous phenomenological descriptions of the mechanical behavior of composite materials have been developed. There is now an urgent need to study and interpret deformation behavior, load transfer, and strain distribution, in terms of micromechanisms at the atomic level. One approach is to characterize dislocation substructure resulting from specific test conditions by the various techniques of transmission electron microscopy. The present paper describes a technique for the preparation of electron transparent composites of aluminum-stainless steel, such that examination of the matrix-fiber (wire), or interfacial region is possible. Dislocation substructures are currently under examination following tensile, compressive, and creep loading. The technique complements and extends the one other study in this area by Hancock.The composite examined was hot-pressed (argon atmosphere) 99.99% aluminum reinforced with 15% volume fraction stainless steel wire (0.006″ dia.).Foils were prepared so that the stainless steel wires run longitudinally in the plane of the specimen i.e. the electron beam is perpendicular to the axes of the wires. The initial step involves cutting slices ∼0.040″ in thickness on a diamond slitting wheel.

Optimization of Process Parameters in Stir Casting of Hybrid Metal Matrix (LM25/SiC/B4C) Composite Using Taguchi Method

2017 ◽  
Vol 13 (9) ◽  
pp. 6475-6479
Author(s):  
M. Arulraj ◽  
P.K. Palani ◽  
L. Venkatesh
Keyword(s):  
Taguchi Method ◽  
Matrix Material ◽  
Base Material ◽  
Stir Casting ◽  
Aluminium Matrix ◽  
Matrix Composites ◽  
Design Concepts ◽  
Specific Strength ◽  
Optimization Of Process Parameters ◽  
Reinforcement Material

Aluminium based composites exhibit many attractive material properties such as increased stiffness, wear resistance, specific strength and vibration damping and decreased co-efficient of thermal expansion compared with the conventional aluminium alloys. Aluminium Matrix Composites consist of non-metallic reinforcement which offers advantageous properties over base material. Reinforcements like SiC, B4C and Al2O3 are normally preferred to improve the mechanical properties. Here Aluminum LM25 is selected as matrix material while Silicon carbide and Boron carbide are selected as reinforcement material. The fabrication of aluminium matrix was done by stir casting method. In the present study an attempt has been made to investigate the effect of three major stir casting parameters (stir speed, stir duration and preheated temperature of reinforcement material) on stir casting of Aluminium LM25 - SiC - B4C composite. Experiments were conducted based on Taguchi methodology. Taguchi quality design concepts of L9 orthogonal array has been used to determine S/N ratio and through S/N ratio a set of optimum stir casting parameters were obtained. The experimental results confirmed the validity of Taguchi method for enhancing tensile strength of castings. 

Effect of Titanium Carbide Particles on Mechanical Properties of Aluminum Matrix Composites

2017 ◽  
Vol 5 (2) ◽  
pp. 20-30
Author(s):  
Zaman Khalil Ibrahim
Keyword(s):  
Mechanical Properties ◽  
Titanium Carbide ◽  
Compression Strength ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Carbide Particles ◽  
Properties Of Composites

In this research aluminum matrix composites (AMCs) was reinforced by titanium carbide (TiC) particles and was produced. Powder metallurgy technique (PM) has been used to fabricate AMCs reinforced with various amounts (0%, 4%, 8%, 12%, 16% and 20% volume fraction) of TiC particles to study the effect of different volume fractions on mechanical properties of the Al-TiC composites. Measurements of compression strength and hardness showed that mechanical properties of composites increased with an increase in volume fraction of TiC Particles. Al-20 % vol. TiC composites exhibited the best properties with hardness value (97HRB) and compression strength value (275Mpa).

Quasi-static penetration behavior of fiber-reinforced polypropylene and acrylonitrile butadiene styrene matrix composites

2021 ◽  
pp. 089270572110079
Author(s):  
Ali İmran Ayten
Keyword(s):  
Glass Fiber ◽  
Energy Absorption ◽  
Matrix Material ◽  
Acrylonitrile Butadiene Styrene ◽  
Fiber Types ◽  
Matrix Composites ◽  
Aramid Fabric ◽  
Penetration Behavior ◽  
Fiber Fabric ◽  
Butadiene Styrene

The quasi-static punch shear behaviors of thermoplastic composites with different polymer matrices and fiber types were investigated. This study was also focused on how much energy absorption capability can be increased by low fiber fractions. Maleic anhydride grafted polypropylene (MA-g-PP) and acrylonitrile butadiene styrene (MA-g-ABS) were used as the matrix material. One layer of aramid, carbon and glass fiber plain weave fabrics was used as the reinforcement material. Quasi-static punch shear test (QS-PST) was applied to the samples to understand the penetration behavior of the samples. The damaged areas were investigated and related to force-displacement curves. The results showed that the neat form of MA-g-PP exhibited 158% more energy absorption than the neat form of MA-g-ABS. In the samples containing one layer of fabric, the highest improvement was observed in the aramid fabric-reinforced MA-g-ABS matrix composites. Aramid fabric increased the energy absorption at a rate of 142.3% in comparison to the neat MA-g-ABS, while carbon fiber fabric and glass fiber fabric increased it by 40% and 63.52%, respectively. Aramid fiber fabric provided no significant improvement in the energy absorption in the MA-g-PP matrix composites, while carbon and glass fiber fabrics contributed to energy absorption at a rate of 48% and 41%, respectively.

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