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Static Stress Analysis with Nonlinear Material Models
Static stress analysis with nonlinear material models enables the study of stress, strain and displacement in systems that have geometric and/or material nonlinearities but no appreciable motion. In this type of analysis, loading can cause large deformation, permanent deformation beyond the material yield point and residual stresses. Damping and mass effects are ignored due to the absence of motion; however, contact between parts of a mechanism or among independent parts can be handled. Nonlinear static stress analyses produce more accurate stress results than linear static stress analyses for models where the loading results in concentrated stress values beyond the material yield point. Usually, these stress concentrations occur near constraints or around small geometric features, such as fillets and holes. The increased accuracy is because linear static stress analyses produce stresses based on the initial shape of the object, whereas nonlinear static stress analyses determine stresses based on the object's deformed shape and account for material nonlinearities. Springs, connectors and components made from plastic or rubber are often the subjects of nonlinear static stress analyses. TYPICAL APPLICATIONS
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