PAK System of programs

PAK-S Program for linear and geometrically and materially nonlinear structural    analysis.

PAK-T Program for linear and nonlinear heat conduction.

PAK-F Program for laminar flow of incompressible fluid and heat transfer.

PAK-P Program for coupled problems of fluid flow trough deformable porous media, including electro-mechanical coupling.

PAK-B Program for biomechanics, modelling of muscules and connective tissue, blood flow trough arteries.

PAK-FM Program for fracture mechanics and fatigue.




Package for Structural Analysis

Linear and Nonlinear Incremental Analysis: statics, dynamics, frequency analysis

Class of Problems: MNO, stability analysis, postcritical structural response, nonlinear dynamics, contact and impact problems with all kinds of nonlinearities, large displacements with small strains, large strains
Iterative Methods in Nonlinear Analysis: BFGS (with line search), full Newton with or without line search, automatic force and displacement control (arc-length method)
Finite Elements: Truss (with gap option), 2D and 3D with enhancements, membrane, shell (with mixed interpolations and membrane enhancements), beam, thin-walled beam, beam with arbitrary and deformable cross-section (beam superelement), rigid body elements
Material Models: orthotropic elastic and thermo-elastic; rubber; Mises thermo-elastic-plastic isotropic and anisotropic, with mixed hardening with or without creep; Cam-clay with critical stress state, generalized cap soil mechanics model,
Loading and Boundary Conditions: Concentrated and distributed loadings, prescribed displacements, multipoint constrains.



Calculation of termal field

Linear and Nonlinear Heat Conduction, stationary and nonstationary problems, 1D, 2D and 3D analysis.



Fluid - structure interaction

Laminar viscous fluid flow, heat transfer and other coupled problems analogous to heat transfer (Newtonian and Non-Newtonian fluid, mixed and penalty formulation, ALE formulation, ...).



Flow trough Porous Media

Seepage Problems: stationary and nonstationary conditions, with free surface; 2-D and 3-D problems.




Material Models: Hill's three-componental model, fiber-fiber kinetics model for connective tissue. Small and large displacements, static and dynamic 2-D an 3-D analysis. Program for biomechanics, modelling of muscles and connective tissue, blood flow through deformable arteries (solid-fluid interaction), cartilage electromechanics.



Fracture Mechanics and Fatigue

Fracture Mechanics: Stress intensity factor (SIF), usage J equivalent domain integral methods (J-EDI) for KI, KII, KIII factor, 2D and 3D problems, FEM, XFEM and Meshless methods.
Fatigue: Low cycle fatigue, high cycle fatigue, fatigue crack growth for monotonic loading and spectral loading.


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