ABAQUS分析收敛控制ABAQUS分析收敛控制.docVIP

Abaqus Analysis Users Manual ? 7.2.1?Convergence and time integration criteria: overview Numerous control parameters are associated with the convergence and integration accuracy algorithms in Abaqus/Standard. These parameters are assigned default values that are chosen to optimize the accuracy and efficiency of the solution for a wide spectrum of nonlinear problems. You can change the solution control parameters, as described in the following sections: A brief synopsis of the more important solution control parameters, together with a description of the circumstances in which they can be used effectively, is provided in “Commonly used control parameters,” Section 7.2.2. This section is likely to be the most useful for the general user and should be read first. Abaqus/Standard incorporates an empirical algorithm designed to solve the equilibrium equations of nonlinear systems accurately and economically. The criteria used to establish convergence of nonlinear increments and the automatic adjustment of increment size based on the convergence rate are described in “Convergence criteria for nonlinear problems,” Section 7.2.3. Abaqus/Standard allows you to choose “time integration accuracy parameters” in problems that have a physical time scale. The algorithms that use these parameters for automatically controlling time increment sizes are described in “Time integration accuracy in transient problems,” Section 7.2.4. Abaqus/CFD allows you to choose the control parameters used in an Abaqus/CFD to Abaqus/Standard or to Abaqus/Explicit co-simulation to alleviate instability and mesh distortion during the analysis. Modifying the default solution controls The default values for the solution control parameters need not be adjusted for most cases. You can reset them, however, within a step definition. Values given for the solution control parameters remain in effect for the remainder of the analysis or until they are reset. Input?File?Usage:?????????? *CONTROLS The *