Two-dimensional problems of beam forming under conditions of creep

Direct and inverse problems of forming of long-length profiles with double curvature and a given angle of twisting under conditions of creep are considered. A finite-difference scheme for the numerical solution is proposed. Examples of solving problems with different types of external actions for a profile with a rectangular cross section are given. Experimental and numerical data are compared for twisting of beams with square and circular cross sections in the regime of creep at temperatures of 725 and 740$^\circ$C for St. 45 steel.