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September 8–11, 2025
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Remembering ANS member Gil Brown
Brown
The nuclear community is mourning the loss of Gilbert Brown, who passed away on July 11 at the age of 77 following a battle with cancer.
Brown, an American Nuclear Society Fellow and an ANS member for nearly 50 years, joined the faculty at Lowell Technological Institute—now the University of Massachusetts–Lowell—in 1973 and remained there for the rest of his career. He eventually became director of the UMass Lowell nuclear engineering program. After his retirement, he remained an emeritus professor at the university.
Sukesh Aghara, chair of the Nuclear Engineering Department Heads Organization, noted in an email to NEDHO members and others that “Gil was a relentless advocate for nuclear energy and a deeply respected member of our professional community. He was also a kind and generous friend—and one of the reasons I ended up at UMass Lowell. He served the university with great dedication. . . . Within NEDHO, Gil was a steady presence and served for many years as our treasurer. His contributions to nuclear engineering education and to this community will be dearly missed.”
Arthur L. Austin
Nuclear Science and Engineering | Volume 20 | Number 1 | September 1964 | Pages 45-52
Technical Paper | doi.org/10.13182/NSE64-A19273
Articles are hosted by Taylor and Francis Online.
If a thin, unrestrained spherical shell is rapidly heated, large inertial hoop stresses may be developed which result in free oscillation. It has been shown that the dynamic stress amplitude is dependent upon the ratio of heating time to the natural period of oscillation as well as upon the maximum temperature. Since a free shell is rarely encountered in practice, the purpose of this study is to determine the dynamic response of a set of concentric spherical shells when the inner shell only is subjected to rapid, uniform, internal heat generation. The maximum number of shells chosen for analysis is three; however, the method is general and may be applied to systems containing as many concentric shells as desired. The results are presented in parametric form for the stresses in each shell and their dependence upon the material properties. In most reactor-design problems it is desired to maintain the integrity of any system; hence, it is assumed that the inner, heated shell always remains elastic. This represents the extreme stress condition, and may cause yielding of the outer shells. For constraint of the inner shell, the dynamic stresses are obtained for elastic motion and when the outer shell is allowed to flow plastically at constant stress. The special case of instantaneous heating and the effect of composite material properties upon stress amplitudes is considered in detail to provide useful design formulae.
