Incremental Plasticity Technical Brief
Abstract: Material nonlinear problems that involve loading conditions that produce stresses outside the quasi-proportional limit (e.g., sequential loading and unloading with reverse plasticity) can now be solved in StressCheck® using the incremental theory of plasticity (ITP). The implementation of the ITP is rate (time) independent and considers the von Mises yield criterion and the associated J2 flow rule with isotropic/kinematic (mixed) hardening for 3D, plane strain, plane stress, and axisymmetric analysis.
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The software provides a highly reliable and user-friendly production stress analysis tool that will replace the Finite Element Method (FEM) tools and failure criteria the experts currently employ for analyzing bonded joints. The software includes an FEM-based handbook format, which allows non-experts to utilize models prepared by specialists. The handbook problems include built-in failure criteria, geometric and material nonlinearities, and the modern FEM technology provides better error control and the treatment of very large aspect ratios.”
Dr. Stephen P. EngelstadTechnical Fellow, Lockheed Martin Aeronautics Company, Structural Methods and Analysis