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The relative thermal stress resistance of five potential radome materials was experimentally determined for heating conditions which simulated radome environments. The effects of wall thickness and notches were also studied. Pyroceram 9608 was found to be the most thermal stress resistant of the five materials studied; the others, in decreasing order of merit, were Pyrex 7740, AD-99 alumina, MgO (99+% dense), Alundum RA-3360. The effects of notches and of the wall thicknesses studied (1/4 inch and 3/8 inch) were small compared with the differences between materials. However, theoretical considerations, together with extrapolation of experimental results, indicated that considerable improvement in thermal stress resistance might be obtained from much smaller wall thicknesses (0.10 inch or less). A fair correlation was obtained between the experimental results and four pertinent parameters. Pyroceram 9608 ranked as the most thermal stress resistant material in the ratings obtained from all four parameters. (Author).
Comparison of cracking characteristics as functions of heat flux was completed for unnotched specimens (both 3/8 and 3/16 inch wall thickness) of the five materials under study. A distinct relative rating of each materials' ability to withstand thermal shock and thermal stresses was obtained. In addition, the results permitted a differentiation between the relative thermal shock-stress resistance of the two wall thicknesses investigated. (Author).
This brilliant treatise is based on extensive experimental and technological data derived from high-temperature materials development processes. The distinguished authors analyse results from the development of nuclear reactors and aerospace rocket engines. They apply this data to the problem of bearing capacity and the fracture of thermally loaded bodies. They establish new regularities of fracture at various modes of local and combined thermal loading.