Journal Announcement: BUBG6oiIL Availability: NTIS, PC A04/MF AOl. GRA (NTIS NTS) ERA (Energy Research Abstracts}. Subfile: Country of Origin: United States Country of Publication: United States Abstract: In this test, panels of varied construction materials and facing thickness were subject to transient heat pulses in unloaded and prestressed conditions to determine if any change in structural integrity could be noted. Initial specimens were instrumented for measurement of temperature-time history at the core-to-facing bond and exposed to thermal radiation. Results of comparative post-exposure mechanical tests on field-exposed, aluminum facing samples showed no noteworthy change in strength characteristics as a result of the radiant exposure. However, tests conducted on similiar specimens pulse-heated in a restrained and prestressed condition showed that failure will occur at temperatures well within the range of that developed in the field-exposed specimens. Initial results of the loads program showed that 0.020-inch aluminum facing on balsa-core specimens will fail at temperature rises of approximately 200 F when subjected to relatively*low stresses during the heating cycle. As the result of a complete study of the heat-transfer characteristics of sandwich construction, a mathematical formulation was derived. When these formulas were programmed for digital computer use, accurate results were obtained. The program could be used with confidence to predict thermal response to heat pulses from nuclear weapons or laboratory heat sources, and could also be used in establishing material criteria for sandwich structures having superior thermal tolerance. Major Descriptors: *AIRCRAFT COMPONENTS -- THERMAL STRESSES; *MECHANICAL STRUCTURES -- THERMAL STRESSES; *NUCLEAR EXPLOSIONS -- THERMAL RADIATION; *REDWING PROJECT Descriptors: BONDING; HEAT TRANSFER; MATHEMATICAL MODELS; THICKNESS Broader Terms: DIMENSIONS; ELECTROMAGNETIC RADIATION; ENERGY TRANSFER; EXPLOSIONS; FABRICATION; JOINING; RADIATIONS; STRESSES Subject Categories: 450202* Weaponry -- (-1989) 10/5/490 01877617 Author(s): -- Explosions & Explosives -- Nuclear -- (Item 190 from file: 103) BRA-12-005143; EDB-87-005250 Wells, H.M.; Roha, D.M.; Sallis, D.V.; Ward, J.V. Title: Operation Redwing. Project 5.4. In-flight participation of a B-57B Corporate Source: Air Force Wright Air Development Center, Wright-Patterson AFB, OH (USA) Publication Date: 1 Sep 1985 p 62 Report Number(s): AD-A-995416/5/XAB Document Type: Report Language: English Journal Announcement: EDB8611 Availability: NTIS, PC A04/MF AOl. Subfile: ERA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: This project was establihsed to determine the response of the structure of the B-57 aircraft in flight to thermal, gust, and overpressure effects of large-yield nuclear explosions primarily for the purpose of defining the delivery capabilities of the aircraft and secondarily to obtain basic information relative to the thermoelastic response of the aircraft structure. In order to obtain the necessary data, the aircraft was instrumented to measure the overpressure, gust, and thermal inputs, and the response of various components of the structure to these inputs. The instrumented aircraft was positioned at Peesenermiped points such that design limits would be approached. A maximum skin temperature of 400 F was the criterion for determination of the amount of thermal radiation which the B-57B could absorb without sustaining permanent buckling of the skin, and 600 F was the criterion for the maximum safe limit. With respect to gust, the aircraft was 9003781