Infrared missile domes: is there a figure of merit for thermal shock?

Claude A. Klein

doi:10.1117/12.130810

14 December 1992 Infrared missile domes: is there a figure of merit for thermal shock?

Claude A. Klein

Proceedings Volume 1760, Window and Dome Technologies and Materials III; (1992) https://doi.org/10.1117/12.130810
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

It is the purpose of this paper to demonstrate that the concept of a 'universal' figure of merit for thermal shock has no merit since the ability of an IR dome to survive transient thermal stresses depends not only on intrinsic material properties but also on the thermal environment as characterized by the Biot number (Bi). For this reason, the thickness of the dome plays an essential role because it may have an impact on the heat-flow regime (thermally thick or thermally thin) and, therefore, on peak thermal stresses. Furthermore, in a thermally thin regime (Bi < 1), the resistance to thermal shock will be enhanced by making the dome as thin as possible, that is, as determined by structural requirements, which are not reflected in the derivation of the Hasselman parameters. The procedure outlined in this paper provides a direct measure of the thermal shock resistance (TSR) in the sense that it yields the 'ultimate' thermal shock temperature, i.e., the allowable recovery temperature rise above the wall temperature at the onset of the shock.

Citation Download Citation

Claude A. Klein "Infrared missile domes: is there a figure of merit for thermal shock?", Proc. SPIE 1760, Window and Dome Technologies and Materials III, (14 December 1992); https://doi.org/10.1117/12.130810

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