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Problemi kovinskih konstrukcij : tankostenski nosilci in elastoplastični materialni modeli : fazno poročilo o rezultatih opravljenega raziskovalnega dela aplikativnega raziskovnja v letu 1994 [za MZT Slovenije] : aplikativni raziskovalni projekt L2-5205/0218-94
Rojc, Tomaž ; Pregl, Miroslav
Part A: Thin-walled beams. On the basis of the theory and the equations described in the previous report a procedure for defining the warping functions and distribution of sheare stresses in ...thin-walled beams is determined in details. There is no need to distinguish between open and closed cross-sections. This represents the basis for a computer program. Test examples are calculated, their results confirm the influence of shear lag. The diagrams of deflections along the axis, the diagrams of normal stresses along the axis and in the cross-sections and the diagrams of shear stresses in the cross-sections are presented. Part B: Elastoplastic material models. Research deals with the solution of elasto-plastic problems at large strains considering two sorts of material, i.e. plasticaly incompressible and a plasticaly compressible material. Constitutive equations are formulated on the basis of an additive approach to the split of rate deformation tensor to an elastic and plastic part, and employ polar decompositions and logarithmic stretches. Particular attention has been paid to an improvement of a mixed solution procedure of the governing equations. The mixed approach has been taken into account owing to prevent a locking phenomenom in the case of complete yielding of finite elements. This improvement has been quite succesfull and has been proved by the solution of problems considering a simple plasticaly incompressible material. As a plasticaly compressible material an elastic-ideally plastic material model with the Mohr-Columb yielding condition has been taken into account, too.
Type of material - research report
Publication and manufacture - Ljubljana : Inštitut za metalne konstrukcije, 1994
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