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Displacement in [mm]

Posted 23 mars 2015, 06:40 UTC−4 Structural Mechanics Version 4.4, Version 5.0 8 Replies

Thomas Bender
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Hello,

I would like to determine the displacement of a point of a leaf spring.
Unfortunately, the result is highly different from the actual construction, I proceeded as follows:
- 3D Model
- Solid Mechanics (solid)
- Stationary Study
- Geometric Imports (Figure 1)
- Material (brass: E=110[GPa], rho=8.44[g/cm^3], and nu=0.37[1])
- add Fixed Constraint 1 (Figure 2)
- add Boundary Load 1 as Total force in y (Force_y = 40[mN] Figure 3)
- add Point Evaluation Y (Select Point Figure 4)
- use expression Model -> Component 1 -> Solid Mechanics -> Displacement -> solid.disp
or Displacement field, X, Y and Z component

is this right? The values in the experimental construction are be much higher.

Thanks for your help
With best regards Thomas
8 Replies Last Post 1 avr. 2015, 15:19 UTC−4
Nagi Elabbasi Facebook Reality Labs
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Posted: 10 years ago 23 mars 2015, 12:57 UTC−4
I don’t see anything wrong with the procedure. If you post the model you’re likely to get someone to look at it.
I don’t see anything wrong with the procedure. If you post the model you’re likely to get someone to look at it.
Thomas Bender
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Posted: 10 years ago 24 mars 2015, 03:58 UTC−4
Thanks for your answer,
I have added the simulate file in this post ;)
Furthermore I customize the model, insertion of a titanium ball.
I noticed that the titanium ball strongly deformed. It would be very nice if you could view the model and can give me tips.

Thank you for your help,

cya Thomas

P.S.: The displacement at 600mN we actually expect at 40 mN
Thanks for your answer, I have added the simulate file in this post ;) Furthermore I customize the model, insertion of a titanium ball. I noticed that the titanium ball strongly deformed. It would be very nice if you could view the model and can give me tips. Thank you for your help, cya Thomas P.S.: The displacement at 600mN we actually expect at 40 mN
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 10 years ago 24 mars 2015, 09:46 UTC−4
Hi

I didn't see any deformation of the ball, but a very large deformation of your thin blade, so I would suggest that you consider the non-linear geometry mode for such large deflexions, and compare your results.

Another point is do you have a static X body load or a "follower" ball-section-normal load, for these deformations that has some importance

--
Good luck
Ivar
Hi I didn't see any deformation of the ball, but a very large deformation of your thin blade, so I would suggest that you consider the non-linear geometry mode for such large deflexions, and compare your results. Another point is do you have a static X body load or a "follower" ball-section-normal load, for these deformations that has some importance -- Good luck Ivar
Thomas Bender
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Posted: 10 years ago 24 mars 2015, 09:57 UTC−4
Hello Ivar,
thanks for your advice. Can you please tell me where I can adjust non-linear geometry?
The model is actually a neodymium magnet ball, fixture on a leaf spring and a magnetic forces (Y-axis) provides the deflected.

Thanks für your help, cya Thomas
Hello Ivar, thanks for your advice. Can you please tell me where I can adjust non-linear geometry? The model is actually a neodymium magnet ball, fixture on a leaf spring and a magnetic forces (Y-axis) provides the deflected. Thanks für your help, cya Thomas
Thomas Bender
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Posted: 10 years ago 27 mars 2015, 06:24 UTC−4
I noticed that the ball is very strongly deformed at very low forces (F=2 x 2N) and for the ball i used Structural steel as material (Build-In).
In the picture you can see the big deformation, can somebody say with what I'm doing wrong?

Best regards

Thomas
I noticed that the ball is very strongly deformed at very low forces (F=2 x 2N) and for the ball i used Structural steel as material (Build-In). In the picture you can see the big deformation, can somebody say with what I'm doing wrong? Best regards Thomas

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Thomas Bender
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Posted: 10 years ago 30 mars 2015, 04:29 UTC−4
Hello again,

it would be great if someone can give me a hint again, because my ball of steel are deform very strong at even 2N force.
This may not agree with the reality ;)

Thank you and best regards

Thomas
Hello again, it would be great if someone can give me a hint again, because my ball of steel are deform very strong at even 2N force. This may not agree with the reality ;) Thank you and best regards Thomas
Thomas Bender
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Posted: 10 years ago 1 avr. 2015, 04:12 UTC−4
Hello again,

sorry for pushing this contribution again. Unfortunately, I'm stuck with my Simulatuion, the deformation of the steel ball is still too big for my used force (see picture in the previous post).
I would appreciate any help or suggestion,

thanks and cya Thomas
Hello again, sorry for pushing this contribution again. Unfortunately, I'm stuck with my Simulatuion, the deformation of the steel ball is still too big for my used force (see picture in the previous post). I would appreciate any help or suggestion, thanks and cya Thomas
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 10 years ago 1 avr. 2015, 15:19 UTC−4
Hi

Looks funny indeed, but your stress is also very high !
at least 100-1000x above yeld stress so I suspect a unit isue in your BC/Domain load there.

And you might have turned on "automatic" scaling ? that gives different scales for different directions

--
Good luck
Ivar
Hi Looks funny indeed, but your stress is also very high ! at least 100-1000x above yeld stress so I suspect a unit isue in your BC/Domain load there. And you might have turned on "automatic" scaling ? that gives different scales for different directions -- Good luck Ivar

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