scholarly journals Numerical Study of the Effect of the Penetration of a Crack in the Matrix of a Composite

2014 ◽  
Vol 4 (3) ◽  
pp. 649-655
Author(s):  
T. Nehari ◽  
A. Ziadi ◽  
D. Ouinas ◽  
B. Boutabout
Keyword(s):  
Silicon Carbide ◽  
Numerical Study ◽  
Temperature Gradients ◽  
The Other ◽  
Thermal Residual Stresses ◽  
Wide Range ◽  
The Matrix ◽  
Silicon Carbide Particles ◽  
Aluminum Silicon Carbide ◽  
Carbide Particles

In this numerical investigation, the effect of the penetration of a crack in a matrix reinforced by aluminum silicon carbide particles in a composite is studied in order to determine the thermo-mechanical behavior under the effect of different temperature gradients during cooling. To realize this, the thermal residual stresses are calculated by considering a wide range of cracks of different penetrations. The results of this investigation compared to a case without geometric discontinuity, have revealed no meaningful effect of the distribution of the stresses along a main direction perpendicular to the direction of the crack. On the other hand, regarding the distribution of the stresses along the plane of the crack and in vicinity of the particle, results show that the penetration of the crack in the matrix causes an asymmetry.

Numerical Study of Residual Thermal Stresses in MMC

2020 ◽  
Vol 22 (4) ◽  
pp. 1099-1110
Author(s):  
Tayeb Nehari
Keyword(s):  
Residual Stresses ◽  
Thermal Stresses ◽  
Numerical Study ◽  
Aluminum Matrix ◽  
Internal Stresses ◽  
Thermal Residual Stresses ◽  
Wide Range ◽  
The Matrix ◽  
Silicon Carbide Particles ◽  
Carbide Particles

AbstractIn this paper, numerical study analysis of residual thermal stresses in aluminum matrix reinforced with silicon carbide particles with double-crack has been carried out. is studied in order to determine the thermo-mechanical behavior under the effect of different temperature gradients during cooling. For a more realistic simulation of the microstructure of these materials subjected to different loadings, a representative volume element may be used. In this paper, three different types of crack width a = 5 μm, 10 μm, 15 μm, has been carried. The thermal residual stresses are calculated by considering a wide range of cracks of different penetrations proximity to particle of 0.1, 0.2 and 0.5 μm. regarding the distribution of the stresses along the plane of the crack and in vicinity of the particle, results show that the penetration of the crack in the matrix causes an asymmetry. The inter-distance between crack and particle plays an important role regarding the generation of residual stresses. The lower the inter-distance, the higher the internal stresses of normal residual stresses of σzz.

The Production of Cast Metal Matrix Composite by a Modified Stir Casting Method

2012 ◽  
Author(s):  
Jasmi Hashim
Keyword(s):  
Silicon Carbide ◽  
Tensile Strength ◽  
Metal Matrix Composite ◽  
Metal Matrix ◽  
Matrix Alloy ◽  
Stir Casting ◽  
The Matrix ◽  
Silicon Carbide Particles ◽  
Carbide Particles ◽  
Particle Addition

Dalam praktik biasa teknik tuangan kacau, komposit matriks logam dihasilkan dengan cara meleburkan bahan matriks dalam suatu bekas kemudiannya leburan logam ini dikacau dengan kuat untuk membentuk vorteks dan bahan tetulang partikel dimasukkan melalui bahagian tepi vorteks yang telah terbentuk. Daripada satu sudut pandangan pendekatan ini mempunyai kekurangan, yang timbul daripada kaedah memasukkan partikel dan kaedah pengacuan. Semasa penambahan partikel ini dilakukan akan berlaku pemejalan setempat dalam leburan tersebut yang teraruh oleh partikel, dan ini akan meningkatkan kelikatan buburan tersebut. Kaedah penambahan partikel melalui bahagian atas ini juga akan memasukkan udara ke dalam buburan yang muncul sebagai poket udara di antara partikel tersebut. Kadar penambahan partikel ini juga perlu diperlahankan terutamanya apabila terdapat peningkatan pecahan isipadu partikel yang digunakan. Proses ini akan memakan masa yang lama terutamanya untuk produk yang lebih besar. Kajian ini mencadangkan satu pendekatan baru untuk menghasilkan tuangan MMC. Apabila semua bahan dimasukkan ke dalam mengkok grafit dan dipanaskan dalam atmosfera lengai sehingga aloi matriks menjadi lebur dan kemudiannya diikuti dengan tindakan kacauan dua-langkap sebelum penuangan ke dalam acuan, mempunyai kelebihan daripada segi menggalakkan kebolehbasahan di antara partikel silikon karbida dengan aloi A359 aloi matriks. Kejayaan penambahan partikel silikon karbida ke dalam aloi matriks telah menunjukkan bahawa kebolehbasahan di antara partikel silikon karbida, dan sifat mekanikal seperti kekerasan dan kekuatan tegangan adalah setanding dengan data sebelumnya yang dihasilkan oleh penyelidik lain. Kata kunci: Komposit matriks logam; tuangan kacau; kebolehbasahan; kekerasan; kekuatan; penyebaran partikel In a normal practice of stir casting technique, cast metal matrix composites (MMC) is produced by melting the matrix material in a vessel, then the molten metal is stirred thoroughly to from a vortex and the reinforcement particles are introduced through the side of the vortex formed. From some point of view this approach has disadvantages, mainly arising from the particle addition and the stirring methods. During particle addition there is undoubtedly local solidification of the melt induced by the particles, and this increase the viscosity of the slurry. A top addition method also will introduced air into the slurry which appears as air pockets between the particles. The rate of particle addition also needs to be slowed down especially when the volume fraction of the particles to be used increases. This is time consuming for a bigger product. This study propose a new approach of producing cast MMC. When all substances are placed in a graphite crucible and heated in an inert atmosphere until the matrix alloy is melted and then followed by a two–step stirring action before pouring into a mould has advantages in terms of promoting wettability between the silicon carbide particle and the A359 matrix alloy. The success of the incorporation of silicon carbide particles into the matrix alloy showed that the wettability between silicon carbide particles and mechanical properties such as hardness and tensile strength are comparable with previous data produced by other researchers. Keywords: Metal matrix composite; stir casting; wettability; hardness; tensile strength; particle distribution.

Effects of Mechanical Alloying on the Mechanical and Tribological Properties of Al-Cu-Mg Matrix Composites Reinforced by Sub-Micron Silicon Carbide Particles

2010 ◽  
Vol 123-125 ◽  
pp. 51-54
Author(s):  
Xiao Yan Deng ◽  
Jin Cheng Xu ◽  
Wei Hua ◽  
Liang Liang Tian ◽  
Li Jun Ai ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Mechanical Alloying ◽  
Tribological Properties ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Mechanical And Tribological Properties ◽  
Carbon Particles ◽  
The Matrix ◽  
Silicon Carbide Particles ◽  
Carbide Particles

Al-Cu-Mg alloy and its matrix composites reinforced with different volume fractions of sub-micron silicon carbide particles have been produced in powder metallurgy route. The effects of silicon carbon particles and mechanical alloying (MA) technology on the mechanical and tribological properties were investigated. The results show that the composites have better mechanical and tribological properties than the matrix alloy, and the 9vol%SiCp/Al-Cu-Mg composite has the best performances. Mechanical alloying (MA) technology further improves the hardness and tensile strength, hardly influences the wear rate of the 9vol%SiCp/Al-Cu-Mg composite but somewhat affects its friction coefficient.

Wettability of Silicon Carbide Particles by the Aluminium Melts in Producing Al-SiC Composites

2015 ◽  
Vol 1128 ◽  
pp. 149-155 ◽  
Author(s):  
Muna Noori ◽  
Mihai Chisamera ◽  
Hazim Faleh ◽  
Florin Ştefănescu ◽  
Gigel Neagu
Keyword(s):  
Silicon Carbide ◽  
Thin Layer ◽  
Surface Temperature ◽  
Active Elements ◽  
The Matrix ◽  
Surface Active ◽  
Sic Composites ◽  
Silicon Carbide Particles ◽  
Carbide Particles ◽  
Existing Data

The paper is a synthesis of essential data regarding the wetting conditions in aluminium – silicon carbide mixtures. Non wetting conditions between the reinforcing element and the matrix turns difficult the incorporation of particles in the aluminium melt. The wettability depends on several elements, like the presence of the oxide layer at the melt surface, temperature, pressure or shape of the complementary material. To improve wetting conditions, several measures are necessary: alloying of the melt with surface active elements, overheating of the melt; coating of the particles with a metallic thin layer. Also, by using existing data reported in the field, some parameters were calculated and interpreted.

scholarly journals Low-Temperature Carbonized Elastomer-Based Composites Filled with Silicon Carbide

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2669
Author(s):  
Andrey A. Stepashkin ◽  
Semen D. Ignatyev ◽  
Dilyus I. Chukov ◽  
Victor V. Tcherdyntsev ◽  
Sergey D. Kaloshkin ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Low Temperature ◽  
Thermal Characteristics ◽  
Reinforced Polymers ◽  
Elastomeric Matrix ◽  
Friction Units ◽  
Wide Range ◽  
Silicon Carbide Particles ◽  
Carbide Particles ◽  
Thermal Stability Of

Thermally stable composites obtained by the low-temperature carbonization of an elastomeric matrix filled with hard dispersed silicon carbide particles were obtained and investigated. Evolution of the microstructure and of mechanical and thermal characteristics of composites during thermal degradation and carbonization processes in a wide range of filling from 0 to 450 parts per hundred rubber was studied. For highly filled composites, the compressive strength values were found to be more than 200 MPa; Young’s modulus was more than 15 GPa. The thermal conductivity coefficient of composites was up to 1.6 W/(m·K), and this magnitude varied slightly in the temperature range of 25–300 °C. Coupled with the high thermal stability of the composites, the observed properties make it possible to consider using such composites as strained friction units instead of reinforced polymers.

The Effect of SiC Surface Treatment on the Interface Bonding Behavior of SiC/Cu Composite Particles

2012 ◽  
Vol 512-515 ◽  
pp. 951-954
Author(s):  
Bing Bing Fan ◽  
Huan Huan Guo ◽  
Jian Li ◽  
Hai Long Wang ◽  
Ke Bao ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Surface Treatment ◽  
Practical Importance ◽  
Functional Materials ◽  
Decomposition Reaction ◽  
Reduction Reaction ◽  
Temperature Oxidation ◽  
Reaction Method ◽  
Silicon Carbide Particles ◽  
Carbide Particles

The SiC/Cu composite is one of the "structural-functional" materials. It shows good mechanical properties and very high thermal, high electrical conductivity etc. But the co-dispersion, wetting and bonding between SiC and Cu interface are of practical importance in the preparation of SiC/Cu composites. In this work, surface treatment techniques such as high-temperature oxidation, acid dipping and alkaline wash were adopted separately on silicon carbide particles, in order to improve the wettability and physical and chemical compatibility between silicon carbide and copper, then we used the replacement reaction method and decomposition-reduction reaction method to generate Cu coating on the surface of silicon carbide. The results shown that, the surface of silicon carbide particle which treated by alkaline wash was cleaner and more rough than that only treated by high-temperture oxidation, moreover, the specific surface of the particle was increased, which resulted in a compact layer of Cu coating. for the same silicon carbide particles, the effect of the Cu coating prepared by decomposition reaction method was better than that by reduction reaction method.

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