Preliminary Design Methods for the OptimizaTion of Insulated Structures for Hypersonic Cruise Vehicles

摘要

A simple method for the preliminary design of insulated structures for hypersonic cruise vehicles is presented. The method of analysis is useful in arriving at the optimum combination of insulating and structural materials for a given loading and thermal environment. Techniques are given for structures subjected to one or more sets of design conditions. A method for screening insulating and structural materials to determine those candidate materials which appear to offer the most promise for lightweight hypersonic structures is discussed. From this screening procedure the insulators pyrolytic graphite and zirconium dioxide and the structural metals beryllium, Ti-13V-11Cr3Al titanium, Rene' 41, HM21A-T81 magnesium, and TZM molybdenum were selected for further study. Optimum design curves for combinations of these materials at exposure temperatures of 3000, 4000, and 5000 F and times of 20 and 60 seconds are given for a wide range of loadings.