Aluminium rectangular sections

Nowadays the smaller sizes of round and rectangular section containers for liquids are often fitted with plastic dispensing closures. It is also possible to produce two-piece screw top containers in aluminium in a similar manner to that in which two-piece aluminium aerosol cans are produced. In this case the base, which may be either flat or domed, is invariably constructed in aluminium so that the resultant container may be used for corrosive chemicals without further internal treatment. 

A flux monitor is irradiated and measured simultaneously with the sample and the standard. A double rectangular section (internal dimensions 26.5 X 9.5 mm) aluminium transport system is used. At the irradiation site, the tubes are placed one after another, the sample being nearest to the target. 

Table 30.4 Current ratings for rectangular aluminium sections, grade E91-E (6101 A)...

We considered the aluminium reduction cell section one meter wide and halfmeter high (LX=LZ=50 cm at Fig.2). Initially the depth of the cathode aluminium pool is 5 cm horizontal and vertical sizes of the carbon anode are 70cm and 30cm respectively the gap between the anode and the side walls and the distance between the electrodes equals 15 cm. We use the rectangular grid containing 100... 

To model the superstructure, five different oscillators were used. Two types of columns (aluminium, steel) were selected in order to vary pier stiffness. AU columns had a rectangular cross section, 3x12 mm. The aluminium and steel piers have a flexural stiffness, /, of 1.89 x 10 kNm and 5.67 x 10 kNm, respectively. 

In Fig. 4.8 the almninium contents at different places of a rectangular specimen with an initial content of 5 wt.% are compared. Obviously it makes no difference if the aluminium content is measured at the centre or on the main surface l-b) of the sample. Thus the general assumption of a imiform aluminimn content across the smallest sample cross-section seems to be justified. A similar behaviour is found for the area l-d) and the border /, the area b-d) and the comer b as well as for the border d and the eomer. If the times to the total consumption of aluminium are compared, one obtains 5200 h for the centre of the sample and 4250 h for the comer. This gives a difference of about 1000 h. At an aluminium content of 1.7 wt.% the differenee is reduced but the comers still go 600 h earlier into breakaway oxidation than the centre of the sample. This effect cannot be neglected in industrial applications. In Fig. 4.9 contours of equal aluminium content after 1000 h of... 

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