StressCheck Tutorial: Limit Load Analysis via Nonlinear Load Stepping
Abstract: A limit load analysis via nonlinear load stepping is performed for a 2D steel plate with close edge distance holes. An elastic-perfectly-plastic nonlinear material curve is assigned to the plate, and fastener elements are used to constrain the plate at the holes as a parametric tensile traction is applied to the top edge of the plate.
After performing a linear analysis to determine the minimum load required to produce plastic strains, Deformation theory of plasticity (DPT) is used during nonlinear load stepping to determine the limit load for which the hole ligament in the image contains unbounded strains and iterative convergence can no longer be achieved.
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“Accurate and reliable stresses and Stress Intensity Factors are required for determination of static and residual strength and for crack growth analyses in analysis tools such as AFGROW. For some geometries, industry solutions are either insufficient or nonexistent. The geometry, applied forces, and crack shapes and dimensions must be modeled reasonably well to obtain useful engineering data. The p-version finite element software StressCheck® (ESRD, Inc., St. Louis, Missouri, USA) is used to demonstrate how accurate finite element solutions can lead to good quality engineering analysis.”