I'm working on the detection of springback in v bending in 2D abaqus. But when I define true stress- true strain graphs for plasticty in a few lines in the material definition, the results of the springback are less than the experiment. But if I define only the line where the plastic strain is 0 (the first line (yield point)) the spring-back estimation gets much closer to the experimental results. Is it a correct method to define only the line where the plastic strain is 0? Do you have any other suggestions or is it enough to use this single line?
I would like to ask that which data points should I enter in FEA software? I have over 400 data points for the compression test of concrete material without any reinforcement. I have converted the raw data by following your video but can't figure out how many data points shall I enter?
Thanks for the explanation but the effective Plastic true strain formula seems not really accurate. Although approximately the result are the same but when there are data, the deviation might be obvious
Thank you so much. Now if we want to make comparison between the curve from lab result with ABAQUS Stress-Strain result ,should we convert ABAQUS S_S to Engineering ? To Have Lab and ABAQUS S-S in one graph? is it true?
merci, comment déterminer les modules de cisaillement G12.G13. G23. et les modules de young longitudinal et transversale avec le coef de poisson d'un composite sur ABAQUS merci
Sorry, the way how you are calculating the effective plastic strain is not correct. You have to subtract the elastic strain from the total strain at the specific stress level. The correct way is described here: abaqus-docs.mit.edu/2017/English/SIMACAEGSARefMap/simagsa-c-matdefining.htm
@@aouiched9613 Usually it would not give the same results. This assumption is only correct, if the stress after the Yield point remains constant. This is usually not the case. There are definitely deviations which cannot be ignored.
thank you very much for explaining this problematic. the way I understand it is that, when you display the 3 graphs at the beginning, the first graph is not a stress-strain curve, but a force-strain curve. (because it's just a force divided by a constant area) correct? thanks
I am afraid you calculated the plastic strain in a wrong way my friend.. You can review the Abaqus documentation regarding this.. You have to use the true stress at each point.. not only the value at yielding. So it is written like this: True plastic strain = True strain - Elastic strain Here.. the elastic strain does not refer to the constant value at yielding but to the elastic strain that would have taken place if the material maintained the elastic behavior. You can simply write this term as follows: Elastic strain = True stress / Modulus of Elasticity So, basically this term is a variable for each step, not a constant. Please check it here: abaqus-docs.mit.edu/2017/English/SIMACAEGSARefMap/simagsa-c-matdefining.htm#simagsa-c-matdefining__simagsa-c-mat-stress-table
Correct. The true stress is changing every data point and so the corresponding elastic strain is also changing at every data point considered. The E value is constant here. Thank you for pointing it out with appropriate documentation.
ı am proud of myself. finally ı am reach to watching the Indian teacher's youtube video level.
Finally someone that goes over the theory and a problem.... 10/10
Sir... U R great... One of the best tutorial video I watched on TH-cam so far....
Thanks so much. The best explanation for this subject
Now you will have a follower
Awesome, thank you!
never knew excel can in such a way🛐
Thank you very much MY FRIEND!
YOU ARE A KING SIR
Thank you so much for tutorial. It is very helpful. However what's the notepad used for?
Thank you very much for sharing this video.
God bless you, so useful and helpful.... Straight to point and very clear... :)
thanks for this great video. I have a question, why did you use 0.000995 as the elastic component? How did you detect that?
tx. i have a question? until when we need to enter the data? until fracture point or up to ultimate tensile strenghth?
HI! Did you found your answer? I am also looking for the same issue!
The point up to which you feed the data will be calculated from the curve and after that the curve is assumed to be straight
Until ultimate tensile strength because that's the point where necking in specimen occurs.
I'm working on the detection of springback in v bending in 2D abaqus. But when I define true stress- true strain graphs for plasticty in a few lines in the material definition, the results of the springback are less than the experiment. But if I define only the line where the plastic strain is 0 (the first line (yield point)) the spring-back estimation gets much closer to the experimental results. Is it a correct method to define only the line where the plastic strain is 0? Do you have any other suggestions or is it enough to use this single line?
Thank you, I was in need of this
what we get from ucs test curve we already consider there actual area, (ao/1+e), is it true area, and considering tht what we get is true strain??
I would like to ask that which data points should I enter in FEA software? I have over 400 data points for the compression test of concrete material without any reinforcement. I have converted the raw data by following your video but can't figure out how many data points shall I enter?
HI! Did you found your answer? I am also looking for the same issue!
Thanks for the explanation but the effective Plastic true strain formula seems not really accurate. Although approximately the result are the same but when there are data, the deviation might be obvious
Thank you so much. Now if we want to make comparison between the curve from lab result with ABAQUS Stress-Strain result ,should we convert ABAQUS S_S to Engineering ? To Have Lab and ABAQUS S-S in one graph? is it true?
how is used the textpad in abaqus?...i mean why should i use the textpad in abaqus???
merci, comment déterminer les modules de cisaillement G12.G13. G23. et les modules de young longitudinal et transversale avec le coef de poisson d'un composite sur ABAQUS
merci
Sir pls do the video for finding hydrostatic stress of cylinder placed in UTM under upset forging
Sorry,
the way how you are calculating the effective plastic strain is not correct. You have to subtract the elastic strain from the total strain at the specific stress level.
The correct way is described here:
abaqus-docs.mit.edu/2017/English/SIMACAEGSARefMap/simagsa-c-matdefining.htm
thanks, but I think it give the same results
@@aouiched9613 Usually it would not give the same results. This assumption is only correct, if the stress after the Yield point remains constant. This is usually not the case. There are definitely deviations which cannot be ignored.
Exactly I was looking for this comment!
Great job bro
Hi, if I want do the same with Nylon PA 6 how can I do?.. i'm trying to find data but unfortunatly i can't ... could you help me?
thanks but if you can make video about ductile damage and stress triaxiality it will be a great works
Great suggestion!
the equations are valid until the beginning of necking. You cannot use until fracture.
thank you very much for explaining this problematic. the way I understand it is that, when you display the 3 graphs at the beginning, the first graph is not a stress-strain curve, but a force-strain curve. (because it's just a force divided by a constant area) correct? thanks
damien dambre just plot in logarithmic scale. n will be the slope and k the intercept on the σ-axis
nice explanation..can I know the name of the faculty.
Sir, how can i start my career as a CAE engineer ?
thank you very much
thank you
Thanks
I am afraid you calculated the plastic strain in a wrong way my friend.. You can review the Abaqus documentation regarding this.. You have to use the true stress at each point.. not only the value at yielding.
So it is written like this:
True plastic strain = True strain - Elastic strain
Here.. the elastic strain does not refer to the constant value at yielding but to the elastic strain that would have taken place if the material maintained the elastic behavior. You can simply write this term as follows:
Elastic strain = True stress / Modulus of Elasticity
So, basically this term is a variable for each step, not a constant.
Please check it here:
abaqus-docs.mit.edu/2017/English/SIMACAEGSARefMap/simagsa-c-matdefining.htm#simagsa-c-matdefining__simagsa-c-mat-stress-table
Correct. The true stress is changing every data point and so the corresponding elastic strain is also changing at every data point considered. The E value is constant here. Thank you for pointing it out with appropriate documentation.
thanks very much