Necking simulation
Necking simulation
(OP)
Hi!
I am modelling a necking problem.I want to get the engineering stress-strain curve. My specimen is 20mm length and 5 mm radious. I model the quarter section considering the axissymmetry and symmetry about horontal axis. My abaqus model 20 mm length and 5mm width. I use axisymmetry element CAX4. I applied uniform displacement load. I get my reactions along the node where i apply uniform displacement load. then, I add all the reaction, then divide by the 5mm (assuming the thickness of the model is 1 unit).
I see the necking. but my Stress-strain result seems to be NOT correct.
Plaese anyone advise me about my procedures are correct?
Thanks
Usitha
I am modelling a necking problem.I want to get the engineering stress-strain curve. My specimen is 20mm length and 5 mm radious. I model the quarter section considering the axissymmetry and symmetry about horontal axis. My abaqus model 20 mm length and 5mm width. I use axisymmetry element CAX4. I applied uniform displacement load. I get my reactions along the node where i apply uniform displacement load. then, I add all the reaction, then divide by the 5mm (assuming the thickness of the model is 1 unit).
I see the necking. but my Stress-strain result seems to be NOT correct.
Plaese anyone advise me about my procedures are correct?
Thanks
Usitha





RE: Necking simulation
Martin Stokes CEng MIMechE
RE: Necking simulation
Thank you very much Martin. i apprecite you.
It works. Really I am learning ABAQUS.
This forum is very helpful.
I am going to donate some money for Eng-tips.com. It is very nice.
usitha
RE: Necking simulation
I need furher clarificaion.
I am modelling a necking problem.I want to get the engineering stress-strain curve. My specimen is 20mm length and 5 mm radious. I model the quarter section considering the axissymmetry and symmetry about horontal axis. My abaqus model 20 mm length and 5mm width. I use axisymmetry element CAX4. I applied uniform displacement load. I get my reactions along the node where i apply uniform displacement load. then, I add all the reaction, then divide by the 5mm
Now my sress is okay, but the strain seems to be half for corresponding stress.
Should I double the displacement result for this axisymmetric and symmetry about horizontal problem to calulate the strain?
Martin Stokes help me!
thanks