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numerical and experimental correlation

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T.Gmai

Mechanical
Apr 1, 2020
8
Hi all,

I am modelling a steel Double edge notched tensile (dent) specimen in abaqus/implicit. I used for the model isotropic hardening, the material properties are acquired from standard uni-axial tensile experiment, quad elements with reduced integration are used and a very refined mesh near the notches in the ligament area. I correlated the simulation results with the experimental data however I didn't obtain a good correlation especially the plastic part as shown in attachment. I tried to refine the mesh and change the element type but without success, any suggestion to improve the correlation would be appreciated.

Thank you in advance.
 
 https://files.engineering.com/getfile.aspx?folder=e2756889-2536-47fc-9902-b26fef7ff37d&file=curve.PNG
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Did you use the Material Calibration tool in Abaqus ? If not, try using it. This feature allows you to import stress-strain data from tensile test and calibrate elastic-plastic behavior for the material.
 
Thank you for your reply.
I didn't use the material calibration tool, I just transformed the engineering stress strain from the tensile test to true stress strain using the equations in excel and implemented in abaqus.
 
Cheer up, at least you've got the behavior roughly right. I often have to model the measuring system as well as the thing that is being tested.

Secondly your displacement transducer seems to have about 0.005 mm of noise in it. I do not like that jag at 2000N. However I do not encourage FEA analysts to start criticising test data until they have exhausted all other possibilities. It would be interesting to see a repeat run.

Third you've got the linear range about right, it is the yielding behavior that you get wrong. That's probably the detail mechanism of the plastic hinges forming. Do they get wrinkles? Can you get the item scanned after the test has been done and see if the deformed shape matches yours.





Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376
 
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