Engineering Materials Vol II (microstructures processing design) 2nd ed - M Ashby D Jones (1999) WW Part 10 potx
Engineering Materials Vol II (microstructures_ processing_ design) 2nd ed. - M. Ashby_ D. Jones (1999) WW Part 10 potx
... unnormalised across the top and normalised by Tg along the bottom. (Thenormalisations make the diagrams more general: similar polymers should have similarnormalised diagrams.)The diagram is divided, ... allowing them to be formed by injection moulding,vacuum forming, blow moulding and compression moulding. Thermosets, on the otherhand, are heated, formed and cured simultaneously, usually by compression ... the molecules increases the volume of the polymer. The extra volume(over and above that needed by tightly packed, motionless molecules) is called the free-volume. It is the free-volume, aided...
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Engineering Materials Vol II (microstructures processing design) 2nd ed. - M. Ashby_ D. Jones (1999) Episode 2 potx
... worked or heat-treated intofinished products; and by understanding these, shape and size can, to a large extent,be predicted.Background reading M. F. Ashby and D. R. H. Jones, Engineering Materials ... what moving the molten zone along the bar has done to it: wehave removed impurity from the left-hand end of the bar and dumped it at the right-hand end; that is, we have zone refined the left-hand ... 2nd edition, Butterworth-Heinemann,1996.Further reading D. A. Porter and K. E. Easterling, Phase Transformations in Metals and Alloys, 2nd edition, Chapmanand Hall, 1992.G. A. Chadwick, Metallography...
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Engineering Materials Vol II (microstructures processing design) 2nd ed. - M. Ashby_ D. Jones (1999) Episode 4 pps
... metals. Liquid met-als do not polymerise and it is very hard to stop them crystallising when they areundercooled. In fact, cooling rates in excess of 10 10°Cs−1 are needed to make puremetals ... (wt%)sy(MPa)Slowly cooled Quenched and aged2000 Al + 4 Cu + Mg, Si, Mn 130 4656000 Al + 0.5 Mg 0.5 Si 85 210 7000 Al + 6 Zn + Mg, Cu, Mn 300 570Work hardeningCommercially pure aluminium (100 0 ... betweenmartensite and parent lattice.DiffusiveAtoms move over distances of 1 to 10 6 interatomicspacings.Atoms move by thermally activated diffusion fromsite to site.Atoms hop randomly from...
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Engineering Materials Vol II (microstructures processing design) 2nd ed. - M. Ashby_ D. Jones (1999) Episode 5 pps
... wear and tear. Untempered martensite is far too brittle for hammerheads.Having solved the immediate problem to our satisfaction we still wondered how themanufacturer had managed to harden the ... bath ofmolten salt at 450°C. Finally, the heads are removed from the tempering bath andwashed in cold water. The rather complicated austenitising treatment is needed be-cause the Standard insists ... the hammers to go above 723°C are theends: so only these parts can be hardened by the quench. The quenched heads are thendried and the ends are tempered by completely immersing the heads in...
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Engineering Materials Vol II (microstructures processing design) 2nd ed. - M. Ashby_ D. Jones (1999) Episode 6 pps
... then re-assembled and poured. When the casting has gone solid itis removed by destroying the mould. Metal moulds are machined from the solid. TheyProduction, forming and joining of metals 143Chapter ... of a shaped casting will directly determine the strength of the finished article.Gas pores should be avoided, so the liquid metal must be degassed to remove dissolvedgases (either by adding reactive ... 9.4 Mg m –3 and 0.90 Nm–1.Answer: 49 mm.14.3 Aluminium sheet is to be rolled according to the following parameters: startingthickness 1 mm, reduced thickness 0.8 mm, yield strength 100 MPa....
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Engineering Materials Vol II (microstructures processing design) 2nd ed. - M. Ashby_ D. Jones (1999) Episode 7 doc
... defect in the small volume subjected to the higheststresses is small.18.3 Modulus-of-rupture tests were done on samples of ceramic with dimensionsl = 100 mm, b = d = 10 mm. The median value of ... sliding, and allowing the clay to be formedby hand or with simple machinery. When the shaped clay is dried and fired, one com-ponent in it melts and spreads round the other components, bonding ... samples were 100 mmlong and had a 10 mm by 10 mm square cross section. The median value of themodulus of rupture was 400 MPa. Tensile tests were also carried out usingsamples of identical material...
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Engineering Materials Vol II (microstructures processing design) 2nd ed. - M. Ashby_ D. Jones (1999) Episode 8 ppt
... polyesters (both widely used asmatrix materials for fibre-reinforced polymers) and the formaldehyde-based plastics(widely used for moulding and hard surfacing). Other formaldehyde plastics, which ... P(DP )d( DP) is the fraction of molecules with DP values between DP and DP + d( DP). The molecular weight is just mDP where m is the molecular weight of themonomer.Most polymer properties depend ... indeed, of wood or bone. That is because wood and bone are composites:they are really made up of stiff fibres or particles, embedded in a matrix of simplepolymer. People have learned how to make...
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Engineering Materials Vol II (microstructures processing design) 2nd ed. - M. Ashby_ D. Jones (1999) Episode 9 potx
... top and normalised by Tg along the bottom. (Thenormalisations make the diagrams more general: similar polymers should have similarnormalised diagrams.)The diagram is divided, like the modulus ... allowing them to be formed by injection moulding,vacuum forming, blow moulding and compression moulding. Thermosets, on the otherhand, are heated, formed and cured simultaneously, usually by compression ... accurate.Compression mouldingBoth thermoplastics and thermosets can be formed by compression moulding (Fig. 24.5).The polymer, or mixture of resin and hardener, is heated and compressed betweendies....
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