Conclusions
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1.
Inexpensive closed solid spherical shells of porcelain possessing a supporting capacity of 45–60 MPa with a relative weight of 0.42–0.6 may be produced by slush casting.
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2.
As in shells of high-strength ceramic and glass, initial deviations from the ideal form have a significant influence on the supporting capacity of spherical shells of porcelain under the action of an all-sided external pressure. In shells characterized by initial deflections on the order of half of the wall thickness stresses equal to 70% of the compressive strength of the material in uniaxial compression tests of rod specimens may be realized under the action of external pressure.
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3.
Shells with a diameter of not less than 550 mm possessing a supporting capacity of ∼60 MPa with a relative weight of 0.7 may be produced by plastic forming of a porcelain mixture.
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4.
The development of methods for the production of ceramic shells with the minimum initial nonuniformities in form is one of the basic directions in increasing their technical characteristics.
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Additional information
Institute of Strength Problems, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Problemy Prochnosti, No. 4, pp. 13–18, April, 1985.
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Belous, K.P., Rodichev, Y.M., Zolotarev, P.F. et al. Supporting capacity with external pressure of spherical shells of porcelain. Strength Mater 17, 457–462 (1985). https://doi.org/10.1007/BF01533941
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DOI: https://doi.org/10.1007/BF01533941