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Thermal expansion characteristics were determined for the fuel-moderator, reflector, cladding, and engineering materials within the SNAP-2 core vessel. Values were determined for AISI Type 347 stainless steel, Hastelloy N, beryllium, zirconium, zirconium hydride, and zirconium-uranium hydrides, from room temperature to temperatures greater than 1300°F. Derived equations were calculated for these materials, using a least squares analysis.
S>The primary objective of the literature search was to determine the best values for the properties involved in the thermal stress parameter. Comparison of data from various investigators indicates that thermal expansion of beryllia is independent of density. A wide variation was found in the thermal conductivity values of beryllia. Graphs and tables are presented which summarize and compare data from various sources. A bibliography of 53 references for some of the major items of the stress parameter (thermal expansion, thermal conductivity, and modulus of elasticity) as well as for general properties of beryllia is given to books, journals, and reports published from 1914 to 1960. (auth).
Excerpt from Thermal Expansion of Beryllium and Aluminum-Beryllium Alloys An examination of Table 5 shows that the coefficients of expansion of these alloys decrease With Increase in the beryllium content. The coefficients of expansion increase with temperature. The coefficlents of expansion on the second heating are generally larger than the corresponding coefficients on the first heating. The maximum deviation betwee'ii the coefficients on the first and second heating is 0. 9 X 1g's, and the average deviation 1s i X At the end of the first test on each sample the length was less than the initial length before the test (0. 01 to 0. 03 per cent), but practically no change In length occurred as a result of the second test. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Single crystals of beryllium were exposed to nanosecond x-ray pulses generated from laser irradiated (1.5 x 1014 W/cm2) gold targets. The characteristic gold M-band centered at 2.5 keV was measured by time integrated transmission grating spectroscopy and time resolved (spectrally integrated) x-ray photodiodes through beryllium targets of various thickness. Approximately decaying exponential temperature profiles were immediately induced in 100 [mu]m thick single crystal targets producing nearly instand surface motion as measured by free surface velocity interferometry. This temperature profile gave rise to a similar velocity history between a c-axis single crystal and a (10{bar 1}0) single crystal where a large initial acceleration gave way to a profile due to the internal temperature gradient. A smooth rise to the peak velocity was then followed by a sharp release originating from the opposite free surface. Differences between the velocities in each of these regions were found between the two single crystals investigated, which were due to the thermal expansion properties as a function of direction (including plasticity). These results can be used to predict behavior of polycrystalline targets relevant to instability seeding in inertial confinement fusion (ICF) ablators.