Compression of Helical Spring

[bogiedreamer]

Hi,
I am using Abaqus for the first time and I my boss won't send me to class until next year. I have an urgent need to perform an analysis of the helical coil spring. So far I only know how run a simple axis-symmetric analysis.

I know it is a lot to ask but I would appreciate very much if you would describe the steps required for analysis of the compression of the helical coil spring. If you see the image you would understand.

Many thanks,

Bogie,

 

[gurmeet2003]

The model appears to have some contacts. Therefore it is not going to be very simple. The steps in doing any analysis are the same:
Define goemetry (you already have it)
mesh the part (shell elements for your part?)
define material properties
impose loads
define constraints ( which end is fixed?)
Run the model
Interpret results.

Are you going to use ABAQUS CAE?

Gurmeet

 

[bogiedreamer]

I am using ABAQUS CAE. I got stuck at this point.

I imported the coil, created part, assign properties, and applied encastre BC (assume symmetry).

Now how can I applied the load. I prefer to have a plate or a plane moving down and compress the coil.

1. Plate, if using a solid plate, do I import the plate and create another part? Then apply position?

2. Can I define a rigid plane that compresses the coil?

Thanks,

 

[amubashar]

Hi,

You can use both methods you mentioned. If you don't need stresses in the plate itself, then a rigid body would be more economical in terms of solution time. You can make a rigid part in the part module and then add it to your assembly. The initial position of the two parts can be controlled by using position contraints. Then the contact has to be defined between the two bodies.

Hope it helps.

Regards

Aamir

 

[bogiedreamer]

amubashar,

Do you mind emailing me at jimmy_v_le@yahoo.com . I need to talk to you.

Thanks,

bogie

 

[bogiedreamer]

For a .004 inch thick, .154 inch diameter helical coil, would you model this spring as a solid or a shell?

Thanks,

Bogie

 

[bogiedreamer]

OK, the model finally converges.

Although I created the two plates as deformable bodies instead of rigid (because for some reasons the rigid bodies model didn't converge). But I used a Young's Modulus that is 1000 times Stainless Steel for the two plates so they are essentially rigid. I understand this increases the cost of computing.

Now, how can I obtain the load that the spring exerts onto the top plate vs. time?

Many thanks,