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Controlling or reducing the amount of cross sectional distortion is of primary concern in sweepings of roll formed sections. Many sections could be used in production with an acceptable amount of distortion, provided the designer could account for this distortion early in the design. A design analysis technique based on a finite element model has been developed to predict the distortion and fracture during the sweeping of roll formed sections. A nonlinear finite element program, ABAQUS, is used to calculate elastic-plastic deformation of a section subjected to bending. Several generic sections have been modeled. The correlation between the calculated results and experimental measurements in distortion of two different cross sections is quite reasonable. This design analysis technique is an effective tool to predict the sectional distortion and fracture during the sweeping of roll formed sections of any arbitrary shape. It can be applied to sweeping with or without mandrel support.

SYNOPSIS A method of cleaning the oil on line was investigated using a bypass fine particulate filter followed by an infra red heater to remove water and light diesel fractions in the oil. This was tested on a range of on road vehicles and a Ford 1.8 litre IDI passenger car engine on a test bed. Comparison was made with the oil quality on the same vehicles and engines without the on-line recycler. Test times were from 200 to 1500 hours of oil ageing and some of the tests showed that the oil quality was still good after 4 times the normal oil life. The results showed that the on line oil recycler cleaning system reduced the rate of fall of the TBN and rate of increase of the TAN. There was a very significant reduction in the soot in oil and the fuel dilution. There was also a consistent reduction in all the wear metals apart from copper and a decrease in the rate of reduction of oil additives. There was also measured on the Ford IDI engine a 5% reduced fuel consumption.