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The report describes a series of tests made on the buckling of high quality. electroformed conical shells under hydrostatic pressure. The thriteen shells shells used were all of high taper ratio, ten having a taper ration of0.75 and 3 are used were all high taper ratio, ten having a taper ratio of 0.75 and 3 are of 0.669. The range of average radius to wall thickness covered was from 600-1200. The method of testing is discussed in detail, and the results obtained are compared with the linear theories of Seide and Singer. (Author).

Thermal buckling of conical shells heated along a generator of the cone is analyzed by Rayleigh-Ritz approach in conjunction with displacement functions modified by a shape factor. A two-term solution is presented in detail and numerical results are correlated with a typical experiment. (Author).

Equations of motion and associated boundary conditions are developed for the general nonlinear vibrational behavior of thin conical shells. The theory is based upon nonlinear strain-displacement relations deduced for a conical shell from those derived by Sanders for thin shells of compound curvature. Equations for the bending, buckling, and postbuckling of conical shells under arbitrary loads are also developed and are shown to reduce to equations based on more simplified theories for both conical and circular cylindrical shells and circular flat plates. Various solution approaches to the nonlinear conical shell vibration problem are examined, and a new numerical method of solution is proposed and discussed. (Author-PL).