I want to simulate a tensile test via ABAQUS. Here is the procedure,
- I have collected force, displacement and minimum cross section diameter during the experiment. By those, I can calculate engineering and true stresses and strains.
- After using the stress correction, equivalent stress-plastic strain data set has been used to define plastic behavior of material in ABAQUS. Since young modulus and Poisson's ratio are also available, ABAQUS/Standard can be used to simulate the experiment. Load-displacement results from experiment and simulation are matching before necking and after necking, simulation load drops respect to the experiment load. (figure 1)
- Trying to match load displacement results by changing stress-plastic strain as a trial and error method, the corrected data set changed back (increased) to the original (uncorrected) true stress-plastic strain. By that, it is like that by using uncorrected true stress-plastic strain data, simulation load-displacement matches the experiment results. Although, in this case neck diameter changes are not matching between simulation and experiment. (figure 2)
* Material: Aluminum / Experiment specimen: round / Simulation model: axisymmetric and 3D / ABAQUS step: General, Static
** Results were checked for mesh dependency, by using finer mesh and ALE. Still, no matching for force-displacement and neck diameter by using corrected stress-plastic strain.
I appreciate if anyone can explain what stress-strain data I need to use to be able to simulate a tensile test after necking, to have both neck diameter and load-displacement match.
Hi- I also use Abaqus to simulate tensile tests but for ULC carbon steels. In my case, I want to predict the macroscopic and mesoscopic (Luders bands) mechanical behavior of this material, and I am not interested in the region after necking. I am just wondering why are you interested in this region after necking? This region is more complex in terms of stress (normal and shear stresses), and if you perform 3 experimental work you should get different responses after necking, don`t you?
Dear Wendel Melo ,
Not necessarily, I have done 2 tensile experiments with round smooth specimens from beginning all the way to the fracture of them. These two experiments results are not exactly the same but close enough to be considered as the same material behavior.
In my case, I am interested in finding more about failure of material and to simulate it, I need to have a valid input for ABAQUS plasticity.
Hi mn ma
I think you would most probably need to input some material damage mechanism, i.e. ductile damage. The simulation looked fairly accurate in general. The deviation towards the end, highlighted by the difference in neck radius, most probably is some damage or void nucleating within the real material, but not within the model.
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