Learning Forum

[euklidespl]

Hello,

I would like to simulate the process of sheet metal stamping and then springback. In both processes, I would like to take into account the Bausinger effect, anisotropy , softening and workhardening stagnation stress reversals, and strain rate . The Yoshida Uemori model + Anisotropic model, e.g., Yld2000 + strain rate, would be suitable for this task. The problem is that LS Dyna does not have such a model . Therefore, I would like to ask if in the first simulation, i.e., the sheet metal forming simulation, I could use the mat_133 model, then transfer the simulation results to a new springback simulation and change the material model to mat_242, and then run a new springback simulation with the mat_242 material model? The mat_133 model has a backstress historyhttps://lsdyna.ansys.com/history-variables/

 

 

[Nanda]

Hello User,

I’m not familiar with forming, but I believe the below information should help:

1. Stage:1 >> Forming Simulation (MAT_242, full Y-U + Yld2000 + strain rate).
2. Include *INTERFACE_SPRINGBACK_LSDYNA in stage-1 >> This writes dynain file with initial stress values.
3. Stage:2 >> Springback Simulation (same MAT_242 card, initial stress values included).

Key cards to use:

• *MAT_242 with card 5 properly calibrated.
• *INTERFACE_SPRINGBACK_LSDYNA in the forming job to dump the consistent state.
• *INCLUDE_DYNAIN in the springback job.
• *CONTROL_IMPLICIT_GENERAL + *CONTROL_IMPLICIT_SOLVER for the springback phase.

I will let others forum members to provide more comments.

Regards,

Nanda.

Introducing Ansys Assistant a 24/7 AI-powered virtual assistant for active Ansys academic customers.

Have a look at our public help documentation website: Ansys Help

For more exciting courses and certifications, hit this link: Ansys Innovation Courses | ANSYS Innovation Space

Guidelines for Posting on Ansys Learning Forum