torsion, tangential pressure, anisotropy, a loading surface, a slope, lines of rupture of pressure, a limiting condition

In work the limiting condition of anisotropic prismatic cores is considered at torsion. It is shown that sides of surfaces of the pressure, adjoining a polygonal contour of a core, are the surfaces of a constant slope with their own corner of a slope. It is also shown that the tangent of angle of an inclination of parts of a loading surface is numerically equal tangential to pressure in a corresponding part of a core. Lines of rupture of pressure coincide with projections of edges of a loading surface on a plane of cross-section of a core.