Metal forming Archives - Page 7 of 10 - LSDYNA

Metal forming

Use the card of *CONSTRAINED_RIGID_BODY_STOPPERSYou can constrain the displacement by specifying a negative value for LCMAX and LCMIN.How is seamless springback analysis done with LSDYNA?

In the input deck, simply include a *INTERFACE_SPRINGBACK_SEAMLESS control card. Make sure to add proper constrains to remove rigid body…

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What are the differences between smooth and non-smooth trimming?

There are two methods in trimming, i.e. smooth and non-smooth trimming. In smooth trimming, the boundary element will be cut…

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What can I do if the direction of the pressure is not reasonable after the mesh had been refined adaptively?

When I used adaptive mesh in hydro forming simulation, there was no problem in the initial stage. However, I found…

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What can I do if the mesh for the last state was not written to the d3plot after restarting from d3dumpxx?

I performed springback analysis using the seamless method, but no converged solution was obtained. Then I wrote a small input…

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What is FLD?

FLD stands for Forming Limit Diagram, and it is a criterion, which is commonly used to evaluate the sheet metal…

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When I did dynamic relaxation analysis in gravity loading process, it took a long time to get a converged solution. Is there a way to make this analysis faster?

If the dynamic relaxation method is used for static loading analysis, the following methods can improve the solution speed: a)…

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When I did forming simulation, I found that a material failure was predicted earlier then expected, what might be the problem?

One of the common mistakes resulting in early necking is that the bad stress-strain curve is used. Usually, the stress-strain…

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When I do springback analysis, the prediction is not satisfactory. I didn’t find any problem in the input deck. What should I check to improve the solution quality?

There are several factors resulting poor springback prediction: a) The final mesh might be too coarse. It has been found…

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What is the commonly used contact type in stamping analysis?

In LSDYNA, there are many choices for contact. What is the commonly used contact type in stamping analysis? The commonly…

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What is the effect of R value (material anisotropic parameter) on FLD?

It does not have significant effect on FLD. R-value affect the draw side of the FLD.

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