The stress-strain curve can be plotted for nonlinear materials in the Material tab, Assign sub-tab by clicking the Plot button in the bottom right of the dialog:

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The Nonlinear solver enables two types: Material (NL Mat) or General (NL Gen).  The Nonlinear solver interface is below:

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Assuming the discretization error was small in the linear solution, the following may cause the Material or General Nonlinear algorithm to fail, producing a LAPACK, element stiffness generation, or some other error:

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If all that is required is to simulate load transfer to holes or a compression-only reaction is desired for a single part, thereby reducing the computational time required for multi-body contact, normal springs combined with a Material or General Nonlinear analysis may be an efficient workflow.

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The StressCheck fastener element is used to represent filled hole simulations in 2D/Planar, with or without shear connections to other Planar bodies.

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In order to determine the applicability and viability of representing loading/unloading events via incremental plasticity theory (IPT), it is important to conduct pre-solution checks before performing potentially time-consuming nonlinear analyses.

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When simulating loading/unloading events (via incremental theory of plasticity (ITP) material nonlinear analysis) in 3D, in certain problem classes the loading conditions may cause a very narrow band of material to barely enter the plastic range.

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When elastic-plastic effects do not need to be considered in a multi-body contact analysis (i.e. the converged maximum von Mises stress in the parts is below the yield stress of the materials), only the Linear Elasticity solver is required.

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Currently, there is not a capability to combine incremental plasticity (Type: Material (NL Mat) with Technique: Incremental) or general/geometric nonlinear (Type: General (NL Gen)) solutions with multi-body contact.

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The von Mises yield criterion (also known as the Maximum Distortion Energy Theory of Failure) is a pure shear based criterion (i.e. plasticity occurs as the crystals shear across lattices). Therefore part of the assumption implies that the hydrostatic component of the stress tensor (which cause no shear) are completely ignored.

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