Feb 16, 2008                                                                                                                                    This page in Russian
    Dear users, our software has been running free of charge for more than 3 years. We would like to thank those who had donated in the past to support our web site. Despite that thousands of calculations were performed each month, we obtained very little money, which was barely enough to pay for our operational expenses.
    We have decided to charge our users a small amount of money to keep the web site running. Please view our subscription information. Even though this is an inconvenience to you, the good news is that this additional income will allow us to develop the web site further. Any improvement suggestions from you are very welcome.
    All calculations are free to try with restrictions on input parameters. Two calculations "Spherical shell" and "Shock absorber" are currently free.

2D Data fitting This calculation allows obtaining approximation of data using generalized Pade (rational) functions. The accuracy of approximation can be managed by user changing values of three main parameters: number of coefficients of Pade function; given accuracy, and correlation coefficient of data fitting. We suppose that this calculation will be useful for researchers and engineers looking for good approximation of data with simple formula.

Cantilever beams & simply supported beams Calculates reactions, bending moments, shear forces and deflections of statically determined beams. The result is represented as diagrams of these components of the beam. Calculation is helpful not only for structural engineers, but also for students because all main steps (formulas) of the solution are provided.

Bending of statically indeterminate (continuous ) beams Calculates reactions, bending moments, shear forces and deflections of statically indeterminate (continuous ) beams. The result is represented as diagrams of these components of the beam. All main steps (formulas) of the solution are provided.

Trusses The purpose of this model is calculation of reactions and internal forces of tension or compression in truss members of statically determinate 2D trusses. It is helpful not only for structural engineers, but also for students because all main steps of the solution are provided.

Bending of isotropic and orthotropic rectangular plate Calculates deflections and stresses of simply supported orthotropic rectangular plate under uniformly distributed load applied to rectangular area. The approximation formula for deflection function is provided.

Buckling of isotropic and orthotropic rectangular plates. Calculates the critical load of simply supported rectangular plate uniformly compressed in two directions.

Shock absorber Calculates the main characteristics of a novel shock (energy) absorber: load-displacement diagram, maximum stresses and absorption energy for a cycle of loading. The shock absorber contains spring and thin elastic reversing shell of revolution with nonlinear behavior. The methodology of calculation is based on the application of new asymptotic formulae, obtained for the Reissner's equations describing axially symmetric deformation of the orthotropic thin shells of revolution by large deflections. The accuracy of the asymptotic formulae corresponds to the accuracy of the initial equations of thin shell theory.

Orthotropic spherical shell under concentrated force Calculates the nonlinear load-displacement diagram, maximum stresses by large deflections of the orthotropic clamped spherical thin shell under concentrated force. The methodology of calculation is based on the application of new asymptotic formulae, obtained for the Reissner's equations describing axially symmetric deformation of the orthotropic thin shells of revolution by large deflections. The accuracy of the asymptotic formulae corresponds to the accuracy of the initial equations of thin shell theory.

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