Weight Advantages

Weight savings can also mean the difference between whether the structure we design can perform its mission or not. The current Space Shuttle payload is limited to 60,000 lb (27,200 kg). If we have an object that we wish to carry up into space that weighs 65,000 lb (29,500 kg), then we are out of luck. That object does not satisfy the Shuttle s weight limit. We must wait for a new-generation Space Shuttle, or sufficient weight in the object to be carried must be saved to fit within the current Space Shuttle limitations. 

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Table 9 Hsts select properties of Co—Cr alloys. It is generally conceded that the casting shrinkage of the cobalt—chromium alloys is greater than that of the gold alloys. The lower density of the base metal alloys provides a weight advantage over the higher-density gold alloys in certain types of bulky restorations. Cobalt—chromium alloys have Knoop hardnesses of 310—415.

Fig. 27.6. A 1 932 Rolls-Royce. Mounted on a separate steel chassis is an all-aluminium hand-beaten body by the famous coach building firm of James Mulliner. Any weight advantage due to the use of aluminium is totally outweighed by the poor weight-to-strength ratio of separate-chassis construction but the bodywork remains immaculate after 48 years of continuous use ...

Demand for amine (neutralization capacity) is determined by C02 loading and amine equivalent weight. Polyfunctional amines appear to have a large equivalent weight advantage, but in practice they often have very low volatility and poor thermal stability. 

The very much lower density of polyurethanes (1.0 to 1.2g/cm3) compared to the lightest of standard metals, namely aluminum (-2.7 g/cm3), gives it great weight advantages. The difference is magnified even more when compared to steel. Parts can be made so much lighter that they can be handled with ease. 

This means that until more oxidation tolerant matrix-interface-fiber systems are developed, service conditions will be rather limited for non-oxide fiber-reinforced CMCs. CMCs do have a large weight advantage over superalloys, however, as well as low observability to radar. 

Composite profiles offer a considerable weight advantage compared to their metal counterparts. This translates into a cost saving when the structural design of the plant and its foundations is made. In the context of an offshore oil platform, where labour is expensive, one man can handle and install a much higher volume of profile than can be achieved with metals. 

As seen in Table 5.1, the mechanical properties of polymer composites compare very well with those of other materials, and further substitution for at least some of the metal in an automobile is feasible. Functionally equivalent plastic components that can replace metal counterparts weigh 50-75% less. Typically, a 10% reduction in vehicle weight is estimated to reduce its fuel consumption by about 5-8%. Therefore, this weight advantage translates into very significant improved fuel efficiency, fossil fuel conservation, and avoided carbon emissions, given the size of the world fleet of vehicles. 

Cytostatic Molecular weight Advantage of AUC intravenous vs. intraperitoneal... 

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