wire bending simulation

[Anonymous]

Can i pose question about example of simulation for horizontal long steel bar (wire) bending down by gravity or force on side end? Sorry for my engish at first. I noticed that side edge when force is applied falling down , and is not moving in arc as it should be in real life, but straight down along axis, so actually that wire or bar  prolongs (stretch) as it falling down?. Is there a way to adjust that bending follow real life situation? You can see easy this "anomaly" (my lack of knowlege) by raising force to bend bar while other side is fixed .. I also noticed same thing by using gravity only - not natural bending . Thanks if somebody know.

[John_Holtz · Accepted solution]

Hi @Anonymous Welcome to the Fusion forum

It is hard to know what is shown in the image because the size is too small (too small for me to read on my monitor ). My guess is that you are performing a linear static analysis which is based on small displacements, and you are exceeding the limitation of small displacement theory. It is similar to this article about why a part "blows up" (expands) instead of rotating: Model "blows-up" instead of rotating when viewing displaced shape of a simulation (In small displacement theory, the difference between the part bending straight down a small distance and it curving is insignificant.)

If your analysis requires large displacements, then you need to perform a nonlinear analysis.

[tyler_henderson · Accepted solution]

A couple things:

1. Since the deformation is relatively large you should use Nonlinear Static Stress rather than Linear Static Stress.

2. Fusion Simulation doesn't yet have "follower loads", which means the Force Load maintains the same direction relative to the global coordinate system rather than relative to the model.  So the load direction doesn't change as the model bends.  Typically this doesn't matter for small deformations, when the deformation is large it can make a difference.

I think you will find the Nonlinear Static Stress gives you more accurate results.

[Anonymous]

Hey, that make sense! Thanks a lot. I wil try that later. In my project i want to play specially with elasticity of material. if somebody find solution to simulate acuratelly large deformations please advise ? Thanks again

[Anonymous]

I just want to thanks you both for yours  help. Non-linear is the key! .  I tested  right now and it works... Just working online is quite slower to solve , and you must be online for nonlinear. Thanks again!