Optimization of the type of finite element representation for simulation of the forming process of elasto-plastic panels

Computer modeling of a forming process for wing panel elements using MSC Software products (MSC.Marc 2007 and MSC.Patran 2007) is carried out. Four 3D finite element models with different types of finite elements (tetrahedral and hexahedral, with trilinear and triquadratic interpolation functions representing coordinates and displacements) are considered. It is shown that application of tetrahedral finite elements of constant deformation does not allow us to calculate the shape of a formed panel correctly. For practical calculations, it is recommended to use hexahedral eight-node finite elements. It is shown that in solving the typical problems of wing panel forming, it is necessary to take into account the geometric nonlinearity of equations of deformation.