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A unified approach to the study of plastic deformation of polymetallic isotropic plates with smooth and piecewise smooth support contours under the influence of static loads is developed. Plates of various types are considered: elliptical; semi-and quarter-elliptical; elliptical belt, «elliptical» sector. Materials of the layers can be ideally plastic or linear hardening. The first limit loads for ideally plastic materials and the second limit loads (initial destruction loads) for hardening materials are determined.

The limit states of polymetallic plates with piecewise elliptic contours