B-17 Flying Fortress in Detail and Scale, Part 2, by Alwyn T. Lloyd

By Alwyn T. Lloyd

D&S Vol. eleven

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Extra resources for B-17 Flying Fortress in Detail and Scale, Part 2, Derivatives - D & S Vol. 11

Sample text

In many cases limited numbers of bolts may be retained to accommodate extreme conditions or facilitate ease of fabrication and handling. In particular, care should be taken to evaluate some or all of the following possible problems: dependence of durability on processing conditions the need to adapt joint designs to avoid cleavage failure limited resistance to extreme service conditions - particularly heat and shock loads may creep at high temperatures optimum strength is not realised immediately specialised jigs may be required for assembly bonded structures are not easily dismantled for repair no straightforward, non-destructive quality control procedures exist.

Another area with special stiffness requirements was the supporting structure for the main engines due to the requirements of noise emission to the water. A finite element analysis for this particular structure showed that the stiffness and noise requirements could be PRACTICAL CONSIDERATIONS 39 fulfilled in a weight-effective manner by using a hybrid laminate with glass and aramid fibres in this area. 1 Production Features Throughout the design, production aspects were of prime concern and feedback from production was continuously given to the designers.

All minor bulkheads should be made structural so that they support the deck above. It is an advantage to keep passageways straight, as bulkheads then provide continuous and rigid lines of support for deck longitudinals and beams. The main deck is required to have a number of hatches and shipping openings. These should be confined to the centre of the ship and kept in line as far as possible. Thus longitudinals can run straight and parallel to the centreline outside the line of openings, with transverse beams running between inner longitudinals to provide local support to the edges of openings.

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