7. 24 b. The design is Fail Safe, Plate/Stiffener construction. c. The necessary shielding material is placed between the inner and outer hulls. d. The volume between the hulls is compartmentalized with compartment pressure approximately equal to hull interior pressure. e. Both Fastenening and Electron Beam welding are used in joining pieces of the structure. Given these assumptions, it is now possible to proceed with the examination of specific components of the structure. Stress analysis calculations in this section will be done in the International Systems of Units (7.10). VII.4.3: Inner Hull: Under normal operating conditions, the inner hull must bear the following components of the total load: a . The agricultural system that provides food for the col ony . b. The buildings, services, supplies, and any other systems needed to ensure the inhabitant's life support. c. The load imposed by the hull mass. d. A portion of the load of the bulkhead mass. Additionally, in the event of an outer hull failure, the inner hull must support the atmospheric pressure load in plate bending (Section VII.2.4, Figure 7.2). VII.4.3.1: Calculations of the Normal Applied Stress - Hull Thickness Relation: To simplify the procedure, consider only the cylindrical section of the hull. Now recalling the interior layout as described in Section VI.3.5, the forces to be considered are those due to the hull, bulkheads, and agriculture. Assume an imposed centrifugal acceleration of lg (9.807 m/sec 2 i. See Appendix VII.E for a determination of the effective mass per unit area of hull,bulkheads,and agriculture. The bulkheads are here presumed to be the same thickness as the hull.
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