March 17, 2023 at 1:11 pmFAQParticipant
Attached is an example of performing springback analysis in LS-DYNA using the seamless method. In the seamless method, LS-DYNA begins by performing an explicit forming simulation. When the termination time is reached, LS-DYNA automatically and seamlessly switches to the implicit method, and continues with the springback simulation. At the time of switching, a user-specified list of parts (the sheet blank) are retained as active, and the remaining parts (the rigid tools) are deleted from the model. All contact interfaces are also automatically deleted. An optional list of nodal constraints are activated to eliminate rigid body motion after the tools are removed for the static springback simulation. After switching seamlessly, LS-DYNA proceeds to perform a static implicit springback simulation. A special set of defaults are used which eliminate all requirements for *CONTROL_IMPLICIT keyword input. These alternate “springback” defaults are identified clearly in the user’s manual, and affect the time step size, artificial stabilization, and automatic time step control parameters. Default parameter values can be overridden by including optional *CONTROL_IMPLICIT keywords into the forming input deck.
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