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Stable warpageWarpage (deflection) is linearly proportional to applied shrinkage stressUnstable warpageIn-plane stresses increase membrane stress to the point of instabilityConversion of in-plane membrane energy to bending energy results in large deformations
Small deflection analysisUsed to investigate linear warpage problems Linear buckling analysis, (Midplane only) Used to identify type of warpage Stable or unstable ( linear or nonlinear ) Large deflection analysis (Midplane only)Used to investigate nonlinear (unstable) warpage problemsAutomatic, (Midplane only)Runs buckling analysisIf part buckles it then runs a large deflection analysis
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