# Unstable collapse and postbuckling analysis

 The Riks method: is generally used to predict unstable, geometrically nonlinear collapse of a structure; can include nonlinear materials and boundary conditions; often follows an eigenvalue buckling analysis to provide complete information about a structure's collapse; and can be used to speed convergence of ill-conditioned or snap-through problems that do not exhibit instability. The following topics are discussed:
 Related Topics Defining an analysis About static stress analysis procedures Introducing a geometric imperfection into a model In Other Guides *STATIC *IMPERFECTION Configuring a static, Riks procedure

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