A Model for Predicting Fracture Toughness of a Cementitious Particulate Composite Molded under Impact Pressure

1987 ◽  
Vol 15 (4) ◽  
pp. 211 ◽  
Author(s):  
A Wolfenden ◽  
WW Crockford ◽  
DN Little
Keyword(s):  
Fracture Toughness ◽  
Particulate Composite ◽  
Impact Pressure

Development and Property Evaluation of Chilled MMC Prepared with LM25 as Matrix and SiO2 (Glass) Particulates as Dispersoids

2015 ◽  
Vol 1101 ◽  
pp. 85-88
Author(s):  
R. Suresh
Keyword(s):  
Fracture Toughness ◽  
Metal Matrix ◽  
Aluminum Matrix ◽  
Particulate Composite ◽  
Stir Casting ◽  
Volumetric Heat Capacity ◽  
Casting Technique ◽  
Property Evaluation ◽  
Particulate Reinforced ◽  
Test Result

Main objective of the present work is to investigate the effect of dispersiod content and the effect of chill on the mechanical properties of chilled MMC with LM25 as matrix and SiO2as dispersoid. Investigation is carried out to evaluate Ultimate Tensile Strength (UTS), Fracture toughness, Hardness, and microstructure of chilled aluminum matrix and Glass particulate composite. The glass (SiO2) particles ranging from 30-to100µm were chosen as dispersiod and added, ranging from 3to 12wt% in steps of 3%. The composite was prepared by stir-casting technique and poured into the sand molds incorporated with non-metallic and metallic chills. Test result showed that this MMC was greatly influenced by the dispersiod and chills. Fracture toughness & UTS of the composite are found to depend on the wt% of the dispersiod and chilling medium. It is observed that chill has influenced hardness of the composite. Volumetric heat capacity (VHC) of the chill is found to increase the amount of heat absorbed. Microstructure analysis has reveled uniform distribution of the dispersiod, which results in improved properties of the particulate reinforced metal matrix composite.

scholarly journals Taguchi’s method of optimization of fracture toughness parameters of Al-SiCp composite using compact tension specimens

2021 ◽  
Vol 11 (2) ◽  
pp. 152-157
Author(s):  
Hareesha Guddhur ◽  
Chikkanna Naganna ◽  
Saleemsab Doddamani
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Grain Size ◽  
Process Parameters ◽  
Particulate Composite ◽  
Compact Tension ◽  
Stir Casting ◽  
Casting Technique ◽  
Silicon Carbide Particulate ◽  
Taguchi’S Design Of Experiments

The objective of this work is to investigate the process parameters which influence the fracture toughness of aluminum-silicon carbide particulate composite prepared using the stir casting technique. The Taguchi’s design of experiments is conducted to analyze the process parameters. Three parameters considered are composition of material, grain size and a/W ratio. From the Taguchi’s analysis, on compact tension specimens, aluminum 6061 reinforced with 9 wt% of the silicon carbide particles composite and a/W ratio of 0.45 are considered to be optimized parameters. Taguchi's technique result shows that the increment in the a/W ratio causes decrement in the load carrying capacity of the composite. Whereas the fine grain size of silicon carbide have better toughness values. From the ANOVA outcomes it is clear that the composition and a/W ratio of the geometry has more influence on the fracture toughness than the grain size of reinforcement.

scholarly journals Effect of Specimen Thickness and Compositions on the Fracture Toughness Investigations of Al7075-SiC/Al2O3 Hybrid Composites

2021 ◽  
Author(s):  
A Alhadhrami ◽  
B M Prasanna ◽  
Saleemsab Doddamani ◽  
Rajesh A M
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Crack Length ◽  
Hybrid Composites ◽  
Particulate Composite ◽  
Stir Casting ◽  
Optimization Techniques ◽  
Width Ratio ◽  
Specimen Thickness ◽  
Regression Techniques

Abstract The current work is to examine the effect of the parameters like specimen thickness, crack length to width ratio and composition of the reinforcements used in aluminium-silicon carbide/alumina particulate composite. The said composite is processed using the stir casting route. Taguchi's optimization techniques such as experiments, ANOVA and regression techniques have been utilized to investigate the parameters. Three factors and their levels considered are the composition of reinforcements (3, 6 and 9 wt%), the thickness of specimen (10, 12, 15 mm) and a/W ratio (0.45, 0.47 and 0.50). Results show increment in composition beyond 6wt%, and a/W ratio decreases the fracture toughness of hybrid composites. From Taguchi's analysis, for a/W ratio = 0.45, 12mm thick specimens and 6wt% of reinforcements in aluminium matrix exhibit the larger fracture toughness. Thus those parameters are considered to be optimized parameters. The analysis shows that the a/W ratio influences fracture toughness, followed by the composition and specimen thickness.

scholarly journals Fracture Toughness and Hardness studying for Polymer-Ceramic Composite

2014 ◽  
Vol 11 (2) ◽  
pp. 547-553
Author(s):  
Baghdad Science Journal
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Particulate Composite ◽  
Weight Fraction ◽  
Optical Microscope ◽  
Preparation Methods ◽  
Weight Percentage ◽  
Hardness Tests ◽  
Heat Treated ◽  
Matrix Hardness

A particulate composite material was prepared by adding the Titanium dioxide (TiO2) with a particle size of (75-150) µm to Epoxy resin at weight percentage of (10%,20%,30%,40%,50%).The following some mechanical properties were studied,fracture toughness, hardness.casting preparation methods were used in this study includes preparing plate of matrix and composites. specimens were prepared according to ASTM for the Mechanical properties tests. After that Another samples were heat treated for three and six hour at 65C?. Fracture toughness (Kic) represent for stress intensity factor results were showed that the curve of three hours aging increases in fracture toughness (Kic) for composites but for six hours aging increases fracture toughness (Kic) for polymer matrix. Hardness tests was showed that hardness results increased with the increase in weight fraction while a samples that not treated thermally have higher hardness than the samples for treated thermally. Finally, fracture surfaces were showed morphology failure surfaces by using an optical Microscope.

Assessment of Dispersiod Content and Chill Effect for Improved Mechanical Properties of Chilled Aluminium Alloy Quartz Particulate Composite

2008 ◽  
Author(s):  
R. Suresh ◽  
Joel Hemanth
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Metal Matrix ◽  
Aluminum Matrix ◽  
Particulate Composite ◽  
Stir Casting ◽  
Volumetric Heat Capacity ◽  
Casting Technique ◽  
Particulate Metal ◽  
Test Result

This paper deals with the assessment of dispersiod content and the effect of chill for improved mechanical properties. Investigation is carried out to evaluate Ultimate Tensile Strength (UTS), Fracture toughness, Hardness, and microstructure of chilled aluminum matrix and quartz particulate composite. In the present work, Quartz (SiO2) particles ranging from 30- to 100μm were chosen as dispersiod and added, ranging from 3 to 12 wt% in steps of 3%. The composite was prepared by stir-casting technique and poured into the sand molds incorporated with non-metallic and metallic chills. Test result showed that this MMC was greatly influenced by the dispersiod and chills. Fracture toughness & UTS of the composite are found to depend on the wt% of the dispersiod and chilling medium. It is observed that chill has influenced hardness of the composite. Volumetric heat capacity (VHC) of the chill is found to increase the amount of heat absorbed. Microstructure analysis also reveled uniform distribution of the dispersiod, which results in improved properties of the particulate metal matrix composite.

Sintering Behavior of Si3N4-TaC Based Composites

2005 ◽  
Vol 498-499 ◽  
pp. 357-362
Author(s):  
Ana Carolina S. Coutinho Rumbao ◽  
José Carlos Bressiani ◽  
Ana Helena A. Bressiani
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Nitride ◽  
Phase Distribution ◽  
Particulate Composite ◽  
High Energy ◽  
Thermomechanical Properties ◽  
Sintering Behavior ◽  
High Temperature Strength ◽  
Kinetics Of

Silicon nitride was the first nitride developed for engineering applications. The excellent combination of thermomechanical properties makes silicon nitride a good candidate for applications where high hardness and mechanical properties are fundamental. However, the low fracture toughness of this material limits its use as structural material. The improve of mechanical properties of silicon nitride comes from many factors, like refined microstructure by restraining grain growth, localized stress, crack tip bridging, etc. Within these factors, microstructure formation of the silicon nitride is critically important for the final properties. The design of silicon nitride based composite materials is of particular interest because of their improved high temperature strength and fracture toughness. In this work, Si3N4-TaC particulate composite was investigated. For this study was prepared a basis composition (CB) with 90%wt a-Si3N4, 6%wt and 4%wt Y2O3 and Al2O3, respectively. TaC (20%vol) was added into CB and after mixture, in high-energy milling, the powder was compacted into pellets. The kinetics of sintering was studied by means of dilatometry. The shrinkage rate versus time and temperature curves exhibit two well-defined peaks. The first peak refers to the particle rearrangement process and the second, more pronounced, to solutionreprecipitation process. It is quite clear that the presence of TaC particles has small influence on sintering kinetics of silicon nitride. It was observed the complete a®b-Si3N4 phase transformation. The microstructure shows good homogeneity both in regard of grain size and secondary phase distribution.

Influence of particle size on the fracture toughness of a PP-based particulate composite

2009 ◽  
Vol 45 (3) ◽  
pp. 281-286 ◽  
Author(s):  
P. Hutar ◽  
Z. Majer ◽  
L. Nahlik ◽  
L. Shestakova ◽  
Z. Knesl
Keyword(s):  
Fracture Toughness ◽  
Particle Size ◽  
Particulate Composite
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