Metal forming

14 Mar 25

What kind of velocity pattern is better for metal forming analysis?

Smoothly changed velocity pattern is found to be better than the others, especially for springback analysis. However, using a complete…

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14 Mar 25

When I a used drawbead in the forming analysis, it was observed that some of the elements which moved over the bead line were distorted, and there is no obvious reason for this effect. What might be the problem?

I do not know what is the exact source of this problem. However, I was very lucky with several similar…

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14 Mar 25

When I attempt to do a springback analysis, I sometimes have difficulty in obtaining a converged solution. What options are available to improve convergence of springback?

There are several ways to improve the convergence a) Use multiple steps in implicit analysis. The step number is defined…

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14 Mar 25

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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14 Mar 25

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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14 Mar 25

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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14 Mar 25

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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14 Mar 25

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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14 Mar 25

What is the effect of R-value on material formability?

The R-value is an index that the material can resist thinning deformation in thickness direction. If a material has a…

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14 Mar 25

When I use FEA, I don’t know how big the mesh size should be. Would you please tell me what is the proper mesh size?

For the blank, there should be at least four to six elements to cover a 90-degree radii region. A coarse…

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