Literature Survey on Advanced Aircraft Materials Essay

Literature Survey on Advanced Aircraft Materials - Essay ExampleThe latter showed that the causes of the accident were metal fatigue. Experts happened multiple fatigue cracks in railway linecraft structure /Fildey, 1990/.Numerous site fatigue damage, which resulted in structural failure, were detected in the process of investigation. The investigation, conducted by the National Transportation Safety Board explained the accident by the inability of the operators maintenance program to detect corrosion damage /Miller, 1990 /.One of the possible interpretations of the problem was the function of lap joints to bond large panels of scramble to one another. These lap points used to run longitudinally along the fuselage. It was supposed that there should be no problem of fatigue cracking due to the strong connection among the overlapping panels. Similar aircraft, which underwent thorough inspection, besides showed disbonding, corrosion and cracking problems in the lap joints /Miller, 1 990 /.Faying surfaces were torn separately in the course of the pillowing, which happened in the result of corrosion processes combined with the subsequent build-up of voluminous corrosion products inside the lap joints / Komorowski, 1996/.So, the main cause of the Boeing 737 air crush was defined structural failure fatigue. This type pf failure is sometimes called metal fatigue, however, this is not precise as even plastic parts can undergo cyclic make full. Cyclic loading of a piece of metal or plastic first of all results in cracks, which further come and expand. This in its turn leads to fracture /Pizzo, 1995 /.The next problem of main aircraft materials is corrosion, which happens in steel, aluminum and titanium. Except of the swinish corrosion, which is particularly common to steel equipment, there also exists another type of corrosion, which is more subtle barely not less dangerous /Pizzo, 1995 /.One of the most dangerous parts of corrosion is the one occurring in mated, moving parts. This results in