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Structural models are constructed for hybrid fiber composite medium, three-dimensional reinforced, and for particular two-dimensional problems. They allow one to determine yield loci for the composition. Three-dimensional stress state in all components is considered. The materials of the composition components are homogeneous and isotropic. Their mechanical behavior is described by the associated flow rule for rigid plastic bodies with quadratic yield conditions. The components have different yield points in tension and compression. The stresses in the components are presented in parametric form for performing constructions. As example, the yield loci are constructed for metal-compositions of magnesium binder and steel fibers.

Structural model for spatially and flatly reinforced medium of rigid-plastic materials considering three-dimensional stress state in all components