Preliminary Creep Deflection Design Method of Radiative Metallic Heat Shields for Advanced AF Vehicles.

摘要

In support of their eventual AF development and use,an analytical investigation of the relative structural efficiency of radiative,coated and uncoated metallic heat shields for long life operation was conducted. The parameters required to establish qualitative performance characteristics for design of reusable heat shields were determined. An optimum weight prediction method was proposed based on the criterion of allowable aero-limited deflection as a direct effect of cyclic creep elongation of the material. Requirements at various temperature exposures were checked against the potential of existing different high temperature alloys on both a strength-to-weight and stiffness-to-weight competitive basis. The feasibility of the mathematical model developed for creep deflection evaluation of different heat shield configurations was partly proven by comparing estimated results and published test data of structural performance. (Modified author abstract)