Development of a New Testing Method for Assessing the Wear Behaviour of Circular Cutting Discs

2008 ◽  
Vol 587-588 ◽  
pp. 966-970 ◽  
Author(s):  
Jorge Cruz Fernandes ◽  
Sergio Pinto ◽  
Pedro M. Amaral ◽  
Luís Guerra Rosa
Keyword(s):  
Wear Rate ◽  
Matrix Material ◽  
Contact Layer ◽  
Wear Behaviour ◽  
Testing Method ◽  
Preliminary Model ◽  
The Matrix ◽  
Applied Forces ◽  
Element Matrix

In the present work a new testing method for assessing the wear resistance of matrix materials employed in the manufacture of diamond tools is presented and discussed. The method allows assessing the wear behaviour of different metallic matrices by simulating a circular cutting action of a tool where, instead of a normal abrasive element (matrix impregnated with diamond) only the matrix material is tested. This method has originated a preliminary model of continuum abrasive contact layer between a rotating circular element made of a metal matrix and a glass material. The model allows the determination of the matrix wear rate at different applied forces. To validate the methodology used, different matrix materials (with different mechanical properties) have been analysed in relation to the experimental wear rate.

Matrix Composition Effect on the Wear Behaviour of Diamond Segments

2007 ◽  
Vol 534-536 ◽  
pp. 1113-1116 ◽  
Author(s):  
Rahmi Ünal ◽  
E. Alper Gurcay
Keyword(s):  
Wear Rate ◽  
Matrix Material ◽  
Cutting Tools ◽  
Matrix Composition ◽  
Wear Behaviour ◽  
Composition Effect ◽  
Diamond Cutting ◽  
Cold Pressing ◽  
Diamond Cutting Tools ◽  
The Matrix

The performances of metal-bond of diamond cutting tools were investigated by changing the cobalt and bronze ratio conversely as the matrix material. Diamond tools were fabricated by cold pressing and sintering under pressure at the temperature up to 750 °C. Investigation of the microhardness behavior of the segments was showed that increasing the cobalt ratio causes the increase of the hardness of the matrix material. This caused to decrease of the wear rate of the matrix. Because the matrix wears more slowly than the diamonds, the space between the cutting edges and the matrix is constantly reduced. The swarf cannot be carried away properly, and the segment will continuously lose its ability to cut with higher cobalt contents.

Polishing process effect on the image of dispersed precipitates

1984 ◽  
Vol 42 ◽  
pp. 534-535
Author(s):  
C.T. Hu ◽  
C.W. Allen
Keyword(s):  
Matrix Material ◽  
Specimen Preparation ◽  
Second Phase ◽  
Precipitate Particle ◽  
Polishing Process ◽  
Second Phase Particles ◽  
The Matrix ◽  
Surface Profiles ◽  
Thinning Process

One important problem in determination of precipitate particle size is the effect of preferential thinning during TEM specimen preparation. Figure 1a schematically represents the original polydispersed Ni3Al precipitates in the Ni rich matrix. The three possible type surface profiles of TEM specimens, which result after electrolytic thinning process are illustrated in Figure 1b. c. & d. These various surface profiles could be produced by using different polishing electrolytes and conditions (i.e. temperature and electric current). The matrix-preferential-etching process causes the matrix material to be attacked much more rapidly than the second phase particles. Figure 1b indicated the result. The nonpreferential and precipitate-preferential-etching results are shown in Figures 1c and 1d respectively.

Impact Strength, Flexural Modulus and Wear Rate of PMMA Composites Reinforced by Eggshell Powders

2020 ◽  
Vol 38 (7A) ◽  
pp. 960-966
Author(s):  
Aseel M. Abdullah ◽  
Hussein Jaber ◽  
Hanaa A. Al-Kaisy
Keyword(s):  
Impact Strength ◽  
Wear Rate ◽  
Flexural Modulus ◽  
Matrix Material ◽  
Weight Fraction ◽  
Pure Pmma ◽  
Calcination Process ◽  
The Matrix ◽  
The Impact ◽  
Interface Bond

In the present study, the impact strength, flexural modulus, and wear rate of poly methyl methacrylate (PMMA) with eggshell powder (ESP) composites have been investigated. The PMMA used as a matrix material reinforced with ESP at two different states (including untreated eggshell powder (UTESP) and treated eggshell powder (TESP)). Both UTESP and TESP were mixed with PMMA at different weight fractions ranged from (1-5) wt.%. The results revealed that the mechanical properties of the PMMA/ESP composites were enhanced steadily with increasing eggshell contents. The samples with 5 wt.% of UTESP and TESP additions give the maximum values of impact strength, about twice the value of the pure PMMA sample. The calcination process of eggshells powders gives better properties of the PMMA samples compared with the UTESP at the same weight fraction due to improvements in the interface bond between the matrix and particles. The wear characteristics of the PMMA composites decrease by about 57% with increases the weight fraction of TESP up to 5 wt.%. The flexural modulus values are slightly enhanced by increasing of the ESP contents in the PMMA composites.

A study on tribological behaviour and analysis of ZnO reinforced AA6061 matrix composites fabricated by stir casting route

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sakthi Sadhasivam RM ◽  
Ramanathan K. ◽  
Bhuvaneswari B.V. ◽  
Raja R.
Keyword(s):  
Wear Rate ◽  
Sliding Wear ◽  
Stir Casting ◽  
Industrial Applications ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Tribological Behaviour ◽  
Content Type ◽  
Zno Particles ◽  
The Matrix

Purpose The most promising replacements for the industrial applications are particle reinforced metal matrix composites because of their good and combined mechanical properties. Currently, the need of matrix materials for industrial applications is widely satisfied by aluminium alloys. The purpose of this paper is to evaluate the tribological behaviour of the zinc oxide (ZnO) particles reinforced AA6061 composites prepared by stir casting route. Design/methodology/approach In this study, AA6061 aluminium alloy matrix reinforced with varying weight percentages (3%, 4.5% and 6%) of ZnO particles, including monolithic AA6061 alloy samples, is cast by the most economical fabrication method, called stir casting. The prepared sample was subjected to X-ray photoelectron spectroscopy (XPS) analysis, experimental density measurement by Archimedian principle and theoretical density by rule of mixture and hardness test to investigate mechanical property. The dry sliding wear behaviour of the composites was investigated using pin-on-disc tribometer with various applied loads of 15 and 20 N, with constant sliding velocity and distance. The wear rate, coefficient of friction (COF) and worn surfaces of the composite specimens and their effects were also investigated in this work. Findings XPS results confirm the homogeneous distribution of ZnO microparticles in the Al matrix. The Vickers hardness result reveals that higher ZnO reinforced (6%) sample have 34.4% higher values of HV than the monolithic aluminium sample. The sliding wear tests similarly show that increasing the weight percentage of ZnO particles leads to a reduced wear rate and COF of 30.01% and 26.32% lower than unreinforced alloy for 15 N and 36.35% and 25% for 20 N applied load. From the worn surface morphological studies, it was evidently noticed that ZnO particles dispersed throughout the matrix and it had strong bonding between the reinforcement and the matrix, which significantly reduced the plastic deformation of the surfaces. Originality/value The uniqueness of this work is to use the reinforcement of ZnO particles with AA6061 matrix and preparing by stir casting route and to study and analyse the physical, hardness and tribological behaviour of the composite materials.

scholarly journals Evaluation of capabilities of the nanoindentation test in the determination of flow stress characteristics of the matrix material in porous sinters

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Lukasz Madej ◽  
Adam Legwand ◽  
Mohan Setty ◽  
Mateusz Mojzeszko ◽  
Konrad Perzyński ◽  
...  
Keyword(s):  
Flow Stress ◽  
Scale Effects ◽  
Imaging Techniques ◽  
Matrix Material ◽  
Indentation Load ◽  
Nanoindentation Test ◽  
Load Range ◽  
Nanoindentation Measurement ◽  
The Matrix

AbstractHerein, we evaluate the nanoindentation test capabilities in the determination of flow stress characteristics of the matrix material in porous sinters. The Distaloy AB sample with 15% porosity after the sintering operation is selected as a case study for the investigation. 2D and 3D imaging techniques are employed first to highlight difficulties in identifying reliable nano hardness measurement zones for further properties evaluation. Then, nanoindentation test results are acquired with Berkovich tip pressed under various loads at different locations in the sample. Systematic indentations in the quartz sample are used as a cleaning procedure to minimize the effect of the possible build-up around the indenter tip. The representative indentation load range is selected based on the extracted material characteristics. With that, the stress–strain response of the sinter matrix material is identified. The reliability of the determined flow stress curve is confirmed with the use of conical nanoindentation measurement results and finite element simulations. Obtained results show that it is possible to calculate reliable flow stress characteristics of the matrix in the porous samples, with the assumption that experiments under various loading conditions and from various locations in the matrix are performed. It is also pointed out that various indentation loads should be used to eliminate the influence of the pile-up or scale effects that affect the overall material response.

Process-Oriented Determination of Preform Permeability and Matrix Viscosity during Mold Filling in Resin Transfer Molding

2015 ◽  
Vol 825-826 ◽  
pp. 822-829 ◽  
Author(s):  
Dino Magagnato ◽  
Frank Henning
Keyword(s):  
Flow Behavior ◽  
Resin Transfer Molding ◽  
Matrix Material ◽  
Low Flow ◽  
Test Fluid ◽  
Transfer Molding ◽  
Reinforced Plastics ◽  
The Matrix ◽  
Reactive Matrix

The resin transfer molding (RTM) offers great conditions for mass production of fiber reinforced plastics. In this process, preformed fiber textiles are infiltrated with matrix material (for example: epoxy resin). During the infiltration, the matrix material starts a curing process until the complete consolidation. After the de-molding and a short post-processing step, the final part is ready to use. To reduce the cycle time for the RTM manufacturing, it is necessary to model and predict the flow behavior of the matrix material in a realistic way. An important parameter is the preform permeability, which characterizes the flow resistance of fibers against the flowing matrix material.In this study a new measurement setup is presented, which is able to determine the permeability directly during the manufacturing process, with integrated pressure and temperature sensors. This approach has many advantages against conventional measurement setups, that try to recreate the RTM process with a simple replication. With these replicas, it is only possible to simulate low flow velocities and pressures. Dynamic effects that occur at higher velocities cannot be regarded. Furthermore, the new setup has the advantage that measurement artifacts, like capillarity, have a lower impact. In addition to that, the infiltration can be done with a constant viscosity test fluid as well as with reactive matrix material. Thus, it allows further determination of the time depending viscosity.

Effect of ZnO Particles on Microstructure, Microhardness and Wear Behaviour of AA7068 Metal Matrix Composites Synthesized by Powder Metallurgy

2020 ◽  
Vol 979 ◽  
pp. 68-73 ◽  
Author(s):  
K. John Joshua ◽  
S.J. Vijay ◽  
P. Ramkumar ◽  
S. Mohanasundaram
Keyword(s):  
Powder Metallurgy ◽  
Vickers Microhardness ◽  
Matrix Material ◽  
Sem Analysis ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Zno Particles ◽  
The Matrix ◽  
Pin On Disc ◽  
Worn Surface

AA7068/ZnO composites were synthesized by powder metallurgy technique with different weight percentages of ZnO (5%, 10%, and 15%) along with as sintered AA7068. A low pressure of 318 MPa was applied for compaction and sintered at a temperature of 560°C for one hour. Microstructural behavior was studied using optical microscopy. Vickers microhardness test was conducted to find out the microhardness. Using pin-on-disc wear-tester experiments were conducted with a velocity of 1.2 m/s over a sliding distance of 2.5 km of load 5 N. Scanning Electron Microscopy (SEM) analysis was carried out to investigate the worn surface. Experimental results showed that the Vickers microhardness number have been increased to 66 by addition of 15% ZnO, which was double that of the matrix material. Wear experiments revealed improved wear resistance by the addition of ZnO particles. SEM analysis exposed that abrasion, delamination and oxidation were the predominant wear mechanisms for the matrix material and AA7068-5% ZnO composite and adhesion and oxidation for composites reinforced with 10% and 15% ZnO particles.

scholarly journals Wear and mechanical prop erties of epoxy/MgO-SiO2 hybrid nanocomposites

2019 ◽  
Vol 13 (26) ◽  
pp. 58-63
Author(s):  
Khalid R. Al-Rawi
Keyword(s):  
Composite Materials ◽  
Wear Rate ◽  
Matrix Material ◽  
Experimental Tests ◽  
Hybrid Nanocomposites ◽  
Nano Composites ◽  
Hybrid Fillers ◽  
The Matrix ◽  
Shear Mixing ◽  
Sio2 Nanocomposites

Preparation of epoxy/MgO and epoxy/SiO2 nanocomposites isstudding. The nano composites were processed by different nanofillers concentrations (0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.07 and0.1 wt%). Epoxy resin and nanocomposites containing differentshape nano fillers of (MgO:SiO2 composites), are shear mixing withratio 1:1,with different nano hybrid fillers concentrations (0.025,0.05, 0.1, 0.15, 0.2 and 0.25 wt%) to preparation of epoxy/(MgOSiO2)hybrid nanocomposites. Experimental tests results indicate thatthe composite materials have significantly higher modulus ofelasticity than the matrix material but the hybrid nanocompositeshave lower modulus of elasticity. The wear rate was decreased innanocomposites and hybrid nanocomposites than the matrix materialand fatigue resistance was increased in nanocomposites and hybridnanocomposites than the matrix material.

DRY SLIDING WEAR BEHAVIOUR OF FLYASH REINFORCED ZA-27 ALLOY BASED METAL MATRIX COMPOSITES

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4703-4708 ◽  
Author(s):  
S. C. SHARMA ◽  
M. KRISHNA ◽  
D. BHATTACHARYYA
Keyword(s):  
Fly Ash ◽  
Wear Rate ◽  
Sliding Wear ◽  
Testing Machine ◽  
Matrix Alloy ◽  
Ash Content ◽  
Wear Testing ◽  
Wear Behaviour ◽  
Wear Volume ◽  
The Matrix

In the present investigation, an attempt has been made to evaluate the wear rate of ZA-27 alloy composites reinforced with fly ash particles from 1 to 3 wt% in steps of 1 wt%. The compo-casting method has been used to fabricate the composites using Raichur fly ash of average size 3-5 microns. The wear specimens are tested under dry conditions using a pin-on-disc sliding wear testing machine with wear loads of 20-120 N in steps of 20 N, and the sliding distances in the range of 0.5 km to 2.5 km. The results indicate that the wear rate of the composites is less than that of the matrix alloy and it further decreases with the increase in fly ash content. However, the material loss in terms of wear rate and wear volume increases with the increase in load and sliding distance, both in the cases of composites and the matrix alloy. An increase in the applied load increases the wear severity by changing the wear mechanism from abrasion to particle-cracking induced delamination wear. It is found that with the increase in fly ash content, the wear resistance increases monotonically. The observations have been explained using scanning electron microscope (SEM) analysis of the worn surfaces of the composites.

Adhesive Wear Behaviour of Aluminium Alloy / Fly Ash Composites

2012 ◽  
Vol 622-623 ◽  
pp. 1290-1294 ◽  
Author(s):  
Prakash J. Udaya ◽  
T.V. Moorthy
Keyword(s):  
Fly Ash ◽  
Aluminium Alloy ◽  
Adhesive Wear ◽  
Matrix Material ◽  
Research Work ◽  
Wear Behaviour ◽  
Weight Percentage ◽  
Casting Technique ◽  
The Matrix ◽  
Measuring Machine

The aim of this research work is to study the influence of wear parameters on the adhesive wear behaviour of aluminium matrix composites (AMCs). It consists of A413 aluminium alloy as the matrix material and particulate fly ash of 3%, 6% and 9% by weight as the reinforcement material. Stir casting technique was used to fabricate the AMCs. The distribution of the fly ash particles in the matrix phase was investigated using the SEM image. The wear tests have been carried out using a pin on disc machine according to the ASTM G99 – 05 specifications. Wear surfaces were analysed using the images captured through Video measuring machine. It was found that load has the highest influence on wear rate followed by sliding distance, sliding speed, and weight percentage of reinforcement.

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