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abaqus direct cyclic
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Any prior (non-cyclic) loads are simply included in the constant part of the Fourier expansion of the residual vectors, and the plastic strains at the end of the preloading step are used as initial conditions for the direct cyclic step. Multiple direct cyclic analysis steps can be included in a single analysis.
To avoid the considerable numerical expense associated with such a transient analysis, the direct cyclic analysis procedure, described in Direct cyclic analysis, Section 6.2.6 of the ABAQUS Analysis User's Manual, can be used to calculate the cyclic response of the structure directly.
The direct cyclic procedure can also be used in conjunction with the damage extrapolation technique to predict progressive damage and failure for ductile bulk materials and/or to predict delamination/debonding at the interfaces in laminated composites in a low-cycle fatigue analysis.
If you want to perform a low-cycle fatigue analysis using the direct cyclic approach then you can specify the maximum number of cycles. In Abaqus/CAE, it's in the Fatigue tab when defining a direct cyclic step.
Low-cycle fatigue analysis in Abaqus/Standard The direct cyclic analysis capability in Abaqus/Standard provides a computationally effective modeling technique to obtain the stabilized response of a structure subjected to periodic loading and is ideally suited to perform low-cycle fatigue calculations on a large structure.
This problem contains basic test cases for one or more Abaqus elements and features. The tests in this section verify the direct cyclic analysis procedure and the low-cycle fatigue procedure using the direct cyclic approach for structures subjected to different types of cyclic loadings, which include distributed forces, concentrated forces, displacements, and temperatures. The direct cyclic ...
ABAQUS/Standard uses an adaptive algorithm to determine the number of Fourier terms during the analysis. Both "automatic" time incrementation and direct user control of the time incrementation can be used in the direct cyclic method.
The DirectCyclicStep object is used to provide a direct cyclic procedure for nonlinear, non-isothermal quasi-static analysis. It 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.
A direct cyclic procedure is a quasi-static analysis that uses a combination of Fourier series and time integration of the nonlinear material behavior to obtain the stabilized cyclic response of the structure iteratively. To avoid the considerable numerical expense associated with a transient analysis, a direct cyclic procedure can be used to calculate the cyclic response of a structure ...
The example in the abaqus manual 1.1.21. Direct cyclic analysis of a cylinder head under cyclic thermal-mechanical loadings seems to suggest that the number of cycles are controlled by the number of incrementation's: