Abstract
Inelastic hehaviour of St. Venant's torsion is discussed in this paper. A yield criterion is firstly introduced taking into account the normal and the shear stresses, and then, performed is the numerical analysis of the torsion of thin steel plates, under axial yield load, which are the elements of the open cross section. Torional tests were carried out on three different grades of steel (SS 41, SM 58 and HT 80) to know the adequacy of the above analysis. Finally the torsional instability problem is described and the limiting values of width-thickness ratio is presented on the basis of the similarlity of local buckling and torsional instability.
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