# Direct cyclic analysis

 A direct cyclic analysis: is a quasi-static analysis; uses a combination of Fourier series and time integration of the nonlinear material behavior to obtain the stabilized cyclic response of the structure iteratively; avoids the considerable numerical expense associated with a transient analysis; is ideally suited for very large problems in which many load cycles must be applied to obtain the stabilized response if transient analysis is performed; can be performed with linear or nonlinear material with localized plastic deformation; can be used to predict the likelihood of plastic ratchetting; assumes geometrically linear behavior and fixed contact conditions; uses the elastic stiffness, so the equation system is inverted only once; and can also be used to predict progressive damage and failure for ductile bulk materials and/or to predict delamination/debonding growth at the interfaces in laminated composites in a low-cycle fatigue analysis. The following topics are discussed:
 Related Topics Defining an analysis In Other Guides *DIRECT CYCLIC *TIME POINTS *CONTROLS Configuring a direct cyclic procedure

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