When performing a StressCheck solution computation, a LAPACK error indicating a non-positive definite matrix may occur immediately or some time after clicking the Solve button:

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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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No, the Modal/Buckling solver cannot currently be combined with multi-body contact analysis. The Modal/Buckling solver is for eigenvalue/eigenmode analysis for single parts.

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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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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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Using StressCheck Parts in tandem with Solution Configurations is a great way to analyze different modeling configurations in the same StressCheck session, as well as quickly switch between different groups of objects for visualization, results extraction and more.

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