Download A Background to Engineering Design by Peter Polak (auth.) PDF

By Peter Polak (auth.)

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Most metals lose strength seriously around the midway mark between 0 °C and the melting point. An interesting exception is aluminium particle sheet, sintered and rolled from powder, which maintains its properties remarkably well up to 400 °C. The sintered structure may be responsible for this, noting that tungsten carbide components are also made from sintered material. Since sintering is coming into very general use for cheap parts, often usable directly, without machining, further advances may be expected in this field.

If we chill the melt rapidly, we obtain a hard, brittle material which is used to provide local wear-resistance. It is, however, too brittle for most bulk purposes. If we cool the melt slowly, equilibrium is obtained with most of the carbon separating as graphite, normally in flake form, giving grey flake iron. The flakes weaken the metal but provide internal damping and also good lubricating properties when the graphite is exposed by machining. m. In fatigue cast iron is not strong but at least it is not notch-sensitive, being full of notches already which also make it brittle.

Direct use of the side-force is shown in figure 46, omitting the main springing for clarity. The axle is located by inclined rubber shear pads or by angled links. It is allowed to deflect slightly sideways (which is detrimental to stability in extreme cases) and as it moves it skews slightly, pointing into the bend and thus compensating for the outward drift in proportion to the side-force. Figure 47 shows how this compensation can be obtained without allowing axle side-movement by using body-roll which is also proportional.

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