Classic Punch and die Probelm.

[chromium44]

Hi Guys, I am new to Abaqus . I am modelling classic lunch and die simulation in Abaqus Explicit. I have some problem with boundary condition. The sheet metal doesnt deform even after its been punched. The Punch just passes over the Sheetmetal. do you have any suggestions ?

 

[IceBreakerSours]

Check the verification, examples and benchmarks manuals in the documentation before you try a problem on your own.

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[chromium44]

Ya I did that , and almost everything is ok. but the sheetmetal doesnt take punch's shape . instead the punch goes right through the sheet. without actually even cutting the metal.! i checked conatct and boundary conditions and seems everything ok .! the rigid body punch has been modelled with Analytical surface.

 

[IceBreakerSours]

Double-check the contact definition.

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[chromium44]

Thanks again for your patience. I double checked it. I have made contact definitions but I don think its correct. Can you please go through the Input file once and give me a suggestion.




*Heading
** Job name: Job-2 Model name: Model-1
** Generated by: Abaqus/CAE 6.10-1
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
** PARTS
**
*Part, name=Clamp
*End Part
**
*Part, name=Die
*End Part
**
*Part, name=Piston
*End Part
**
*Part, name="Sheet Metal"
*End Part
**
**
** ASSEMBLY
**
*Assembly, name=Assembly
**
*Instance, name=Clamp-1, part=Clamp
-4.62372333094489e-16, 1.77, -1.5786378905173e-15
*Surface, type=REVOLUTION, name=CP-2-Clamp-1
START, 55., 1.25000000000001
LINE, 19.75, 1.25
LINE, 19.75, 25.
*End Instance
**
*Instance, name=Die-1, part=Die
*Surface, type=REVOLUTION, name=CP-3-Die-1
START, 60., 3.00000000000002
LINE, 25., 3.
CIRCL, 20., -2., 25., -2.
LINE, 20., -5.00000000000001
LINE, 24., -5.00000000000001
LINE, 24., -25.
*End Instance
**
*Instance, name=Piston-1, part=Piston
9.19800091096544e-16, 22.02, 0.
*Surface, type=REVOLUTION, name=CP-1-Piston-1
START, 19., 15.
LINE, 19., -11.
CIRCL, 15., -15., 15., -11.
LINE, 0., -15.
*End Instance
**
*Instance, name="Sheet Metal-1", part="Sheet Metal"
1.06640670125363e-15, 3.00999999999999, -1.94908591625969e-15
1.06640670125363e-15, 3.00999999999999, -1.94908591625969e-15, 0.707106811231782, 3.00999999999999, -0.707106811231783, 180.
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1251, -38

 

[burningDiesel]

give the .inp as an attachment
Problem can be either too soft penalty contact (if you are using penalty contact). Or too large elements in contact. The stiffer and more refined part should be the master surface. Try surface to surface contact. Include a seperate contact between edges (instead of faces).

 

[GMarsh]

sdebock - I agree that stiffer part should be master surface. But not refined. Usually when we use node-to-surface contact, then the slave surface should be more refined. And when surface-to-surface contact is used, there is no difference which one is refined.

As sdebock suggested, it is good if you attach the .inp file instead of pasting it here.

 

[IceBreakerSours]

As others have suggested, uploading the INP is the best solution (unless its bulky). The other option is to upload your CAE (with the .jnl file; otherwise version issues may make the file useless to others).

Also, according to the documentation (Defining contact between two separate surfaces) in section 34.3.1 (version 6.11pr3), there are three factors you should consider when deciding which surface to set as your master surface:

[ul]
[li] The larger of the two surfaces should act as the master surface. [/li]
[li] If the surfaces are of comparable size, the surface on the stiffer body should act as the master surface.[/li]
[li] If the surfaces are of comparable size and stiffness, the surface with the coarser mesh should act as the master surface.[/li]
[/ul]

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[burningDiesel]

The 2 above me are correct concerning the higher refined mesh better being slave nodes. My bad.