The Experts below are selected from a list of 42645 Experts worldwide ranked by ideXlab platform
C Lane - One of the best experts on this subject based on the ideXlab platform.
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machinability of a silicon carbide reinforced aluminium Metal Matrix Composite
Wear, 1995Co-Authors: Debes Bhattacharyya, C LaneAbstract:Abstract The machinability of a DURALCAN ® aluminium Metal Matrix Composite (A359/SiC/20p) has been studied in this paper. Continuous turning of round Composite bars using tools with 25 mm polycrystalline diamond (PCD) inserts has been selected as the test method. The Matrix of test conditions included cutting speeds of 300, 500 and 700 m min −1 and feed rates of 0.1, 0.2 and 0.4 mm rev −1 while the depth of cut has been kept constant at 0.5 mm. The performance of the tools is based on development of 0.25 mm maximum flank wear, which has been monitored by optical and scanning electron microscopy. The tool life data have been analyzed using regression techniques and a general form of the Taylor equation has been developed to describe the tool performance on this Composite. The time required to reach the tool wear limit decreased with increases of speed and feed. However, the volume of material removed before reaching the wear limit actually increases with the higher feed rate. These phenomena have been reconciled by rewriting the Taylor equation in a modified form. Practical implications of this deviation are discussed and comments are made on the effects of cutting parameters on surface finish and chip formation.
D M R Taplin - One of the best experts on this subject based on the ideXlab platform.
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the turning of an al sic Metal Matrix Composite
Journal of Materials Processing Technology, 1992Co-Authors: L A Looney, John Monaghan, P Oreilly, D M R TaplinAbstract:Abstract Metal-Matrix Composites are a relatively new range of materials possessing several characteristics that make them useful in situations where low weight, high strength, high stiffness, and an ability to operate at elevated temperatures are required. These materials are difficult to machine, however, consisting of a hard abrasive ceramic reinforcing medium set within a more ductile Matrix material. This paper presents results from a series of turning tests in which a number of different cutting-tool materials were used to machine an Al/25 vol% SiC Metal-Matrix Composite. The influence of the cutting speed on the tool wear, the surface finish, and the cutting forces was established for each tool material. It was found that carbide tools, both coated and uncoated, sustained significant levels of tool wear after a very short period of machining. The best overall performance was achieved using a solid cubic boron nitride, CBN, insert whilst the worst was encountered using a solid silicon nitride, Sylon, tool.
M E Fitzpatrick - One of the best experts on this subject based on the ideXlab platform.
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fatigue and fracture of a 316 stainless steel Metal Matrix Composite reinforced with 25 titanium diboride
International Journal of Fatigue, 2013Co-Authors: D H Bacon, L Edwards, J E Moffatt, M E FitzpatrickAbstract:Fatigue and fracture mechanisms have been studied in a steel-based Metal Matrix Composite (MMC), comprising a 316L austenitic Matrix reinforced with 25 wt% particulate titanium diboride (TiB2). The fracture toughness was determined in the as-HIPped condition as being slightly below 30 MPa√m. Fatigue crack growth rates have been determined, and corrected for the effects of crack closure. The fracture surfaces have been studied to determine the mechanisms of damage during crack advance, which are determined as Matrix fatigue, reinforcement particle fracture, and ductile rupture of the Matrix. We show that the occurrence of damage mechanisms during fatigue of the material is linked to Kmax, rather than to ∆K. This is rationalised in terms of a semi-cohesive process zone within the monotonic plastic zone ahead of the crack tip.
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separation of macroscopic elastic mismatch and thermal expansion misfit stresses in Metal Matrix Composite quenched plates from neutron diffraction measurements
Acta Materialia, 1997Co-Authors: M E Fitzpatrick, M T Hutchings, P J WithersAbstract:Abstract Neutron diffraction measurements of the strain profile in a quenched plate of an aluminium-dash;silicon carbide particle-reinforced Metal Matrix Composite are reported. The results have been used to evaluate the efficacy of an analysis technique which allows distinction of the stiffness mismatch and shape misfit stresses between the Matrix and reinforcement, as well as between these and any macrostress present. The analysis is presented for measurements made on a Metal Matrix Composite plate which, as a consequence of quenching from elevated temperature, shows large variations in residual stress as a function of position through the plate thickness. The measurements illustrate the additional insight which can be obtained through the separation of the elastic mismatch and thermal misfit stresses. The stress components thus obtained show good agreement with calculated long-range residual and mismatch stresses.
Debes Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.
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machinability of a silicon carbide reinforced aluminium Metal Matrix Composite
Wear, 1995Co-Authors: Debes Bhattacharyya, C LaneAbstract:Abstract The machinability of a DURALCAN ® aluminium Metal Matrix Composite (A359/SiC/20p) has been studied in this paper. Continuous turning of round Composite bars using tools with 25 mm polycrystalline diamond (PCD) inserts has been selected as the test method. The Matrix of test conditions included cutting speeds of 300, 500 and 700 m min −1 and feed rates of 0.1, 0.2 and 0.4 mm rev −1 while the depth of cut has been kept constant at 0.5 mm. The performance of the tools is based on development of 0.25 mm maximum flank wear, which has been monitored by optical and scanning electron microscopy. The tool life data have been analyzed using regression techniques and a general form of the Taylor equation has been developed to describe the tool performance on this Composite. The time required to reach the tool wear limit decreased with increases of speed and feed. However, the volume of material removed before reaching the wear limit actually increases with the higher feed rate. These phenomena have been reconciled by rewriting the Taylor equation in a modified form. Practical implications of this deviation are discussed and comments are made on the effects of cutting parameters on surface finish and chip formation.
L A Looney - One of the best experts on this subject based on the ideXlab platform.
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the turning of an al sic Metal Matrix Composite
Journal of Materials Processing Technology, 1992Co-Authors: L A Looney, John Monaghan, P Oreilly, D M R TaplinAbstract:Abstract Metal-Matrix Composites are a relatively new range of materials possessing several characteristics that make them useful in situations where low weight, high strength, high stiffness, and an ability to operate at elevated temperatures are required. These materials are difficult to machine, however, consisting of a hard abrasive ceramic reinforcing medium set within a more ductile Matrix material. This paper presents results from a series of turning tests in which a number of different cutting-tool materials were used to machine an Al/25 vol% SiC Metal-Matrix Composite. The influence of the cutting speed on the tool wear, the surface finish, and the cutting forces was established for each tool material. It was found that carbide tools, both coated and uncoated, sustained significant levels of tool wear after a very short period of machining. The best overall performance was achieved using a solid cubic boron nitride, CBN, insert whilst the worst was encountered using a solid silicon nitride, Sylon, tool.