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The Theory of Diffusion in Strained Systems
A general theory of solid-state diffusion in strained systems is developed on a molecular-kinetic basis. The theory predicts that for simple strains the diffusion coefficient is an exponential function of the lattice parameter and that the rate of change of the diffusion coefficient with strain is linearly related to the interatomic forces. It has also been shown that for plastic flow the diffusion coefficient is a linear function of strain rate. All the conclusions are confirmed by the data available in the literature.
Application of a Supersonic Kernel-function Procedure to Flutter Analysis of Thin Lifting Surfaces
A description is presented of a systematic procedure for obtaining generalized aerodynamic forces from the lifting-surface theory by the supersonic kernel-function method and for using those forces thus obtained in a Galerkin modal flutter analysis. The method is applicable to planforms with subsonic leading and supersonic trailing edges. Analytical flutter results were obtained and compared with experimental values from three flutter models.
Report
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Proceedings of Symposium on Aerothermoelasticity
A symposium on Aerothermoelasticity was held to present the latest significant developments in each scientific area and engineering area that comprise the component parts of this technology. New and significant contributions were presented in four technical areas consisting of dynamic aerothermoelasticity (flutter), stability and control, thermodynamics and aerodynamics (or aerothermodynamics), and structures including material and construction concepts. Categories important and significant to each technical area are discussed state-of-the-art wise. In addition, 26 separate papers are given on items of special importance.
Annual Report
18 -1905 include the Annual report of the superintendent of public schools.
