Metal forming Archives - Page 6 of 10 - LSDYNA

Metal forming

Do I have to consider the thickness of the rigid bodies?

*CONTACT_FORMING_xxxxx should be used for stamping analysis. This contact treatment does not consider the thickness of the rigid body. This…

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Do I have an easier way to define the velocity curve?

Yes, you can use *DEFINE_CURVE_SMOOTH. With this card, you can easily define a smoothly changed velocity curve

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Do I have to consider the thickness of the blank?

Yes, the thickness of the blank should be considered when performing a sheet metal stamping analysis as blank thickening and…

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Can I arbitrarily pick the nodes to constrain for a springback analysis?

It depends on the problem. Many people simply pick the constrain nodes, and after spring back analysis, they use rigid…

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Can you explain the failure behaviors that occur in sheet metal forming?

There are two major failures in sheet metal forming processes, i.e. localized necking and wrinkling. Localized necking results from too…

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After the trimming process, some of the elements in the blank mesh have become distorted around the trim line. How can this be avoided?

If there is an overlap of a trimming line, it is possible to have distorted mesh after trimming. Double check…

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There are several linear solvers for implicit analysis. Can you tell me which one is the fastest and most accurate?

Solver 5 is the fastest (this solver is available after version ls960). If convergence is difficult, try some other solver

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There are several non-linear solvers for implicit analysis – which one is better?

The Full Newton method has been found to behave very nicely in springback analysis, while BFGS is very fast if…

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There is no load applied to the blank when I used *LOAD_MASK. What might be the problem?

When I used *LOAD_MASK for hydro-forming analysis, first I have no problem in applying the load, but the load is…

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