Excellent video! Keep it up. I'm learning from your videos. Thanks for your contribution to FE modelling.

Thank you SimTech05, this is an excellent presentation on the complicated issue of "damage" prediction.

Absolutely excellent. Thank you for the clear and thorough explanation!

Good job. It has been demonstrated in several articles that triaxiality factor, which is correlated to the first deviatoric invariant, and the normalized Lode angle, which is correlated to the second and third deviatoric invariant, are the main parameters which characterize the initiation of ductile damage. The study of fracture propagation is more complex than initiation. There are different models based on Continuum Damage Mechanics or experimental mechanics. A very accurate prediction model for damage initiation in tensile test is the Bao-Wierzbicki Damage Model. It’s very simple to write a subroutine with this model to use with FEM. I suggest to you to try it.

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Great job, valuable video

such a informative video sir please keep it up

Thanks a lot for a nice explanation.

thanks for the great video

Nice video sir. As per this theory, if we opt for a coarser mesh, the material will undergo sudden failure. But if the mesh size if finer, then the then the material will undergo a gradual failure. Because the ultimate deformation depends only on the strain and characteristic length. In that, strain is a constant and characteristic length is varying as per the mesh size.. So, same material can have dissimilar stress strain response with mesh refinement which is little confusing..please correct me if I am wrong..

Thank you, sir! Brilliant explanation! So basically, the element deletion highly depends on the characteristic length of the element, yes? It is far preferable to have consistent SIZE of elements in the region of damage-prone (e.g., hex elements) because they provide a better shape and size if we mesh them strategically. More than that, we need to find the smallest element in the meshing part and calculate its characteristic length (must consider what type of element order too). And if we choose the biggest element with characteristic length as input, then it would be troublesome for small elements because they would be instantly deleted and not accurate for the simulation. According to what you've presented, Upl=characteristic length* plastic strain is essentially a failure displacement at the local level or the failure of a single smallest element. When those conditions are met (e.g., 0.15875), any element in the part will be automatically deleted by Abaqus. And also, it would be nice if you could share with us how to calculate the characteristic length for 3D elements (hex and tetra shape). Thank you again for this knowledge.

Nice video. Thank you so much!

Thank you so much !!! it helped !!

please upload the second part of this videos its very useful

Great video, but I think at 27:10 there is a mistake. According to the Abaqus manual e_pl_f is not called fracture strain but equivalent plastic strain at failure. I think the fracture strain would correspond to e_pl_0, but correct me if I am wrong.

Good video lecture

thank you

thank you very much! Excellent video！ I learned lot from it. and I am little confused about one thing about it: at the end of this video, you calculated failure displacement with 0.05*4(characteristic length), but in the plastic table, 0.05 corresponded to 110MPa，which is damage stress, so it means 0.05 is damage strain, not failure strain. the failure displacement is supposed to be calculated by damage strain, am I wrong somewhere?

Thank you so much, sir. Could you explain how the model recognizes that it should fail in 45 Deg direction which well agrees with the actual ductile material fracture behavior?

In the damage parameters, the failure strain should be the effective plastic strain. How are the parameter determined? Can it be obtained from the actual stress-strain curve?

Very good job and very interesting video! I woul ask you if you know a book where I can learn more about these topics. Thanks in advance

the displacement at failure is calculated with the ultimate plastic strain or with the plastic strain at maximum stress?

Hi sir, displacement at failure at which direction you mean because we have 3 direction x, y and z ?. if you can explain that I will be very gratefull

Awesome video sir, thank you very much for sharing this knowledge. Sir, is it possible to share ppt you explained?

Sir, Could you please explain damage criterion for non metals like rock, soil?

Sir you have calculated the displacement at failure as 4*0.05 = 0.2. I have a doubt that u are working in mm coordinate system thats why your element charcteristic length is 4mm. if I m working in SI coodinate system them for this case my displacement at failure will be 0.004*0.05 = 0.2e-3. Am I correct??

Is it possible to simulate polymers using the ductile criteria of metals? If it's yes, does it have a scientifc paper talking about this possibility? Thank you for the video!

The curve strain stress may change with dimensions of spicemen??

Sir is there any way by which we can model that material fails only in tension and not in compression

Sir where is the option to define in plane fracture toughness values in abaquas material property

Thank you for your share! I learned a lot from your video. Please allow me to ask you one question. How do you apply ductile and shear criteria to get different fracture angles? I am working on this problem. Hope to get your kind suggestions. Thanks

Sir, can you please make a video on Disc Brake Noise Complex Frequency Analysis? I am doing a project on Abaqus and stuck on it.

I am trying a metal matrix composite system. Can you suggest the material model for matrix and reinforcement(ceramic) under both static and dynamic conditions for a simple compression test modeling ?

Very nicely explained sir.... please make video on fatigue crack growth using xfem.

It is curve to Engineering curve??

thank you for your good explanation. When will be released the second part of video?

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Thanks sir!, about theory, what is the difference between the damage model of LEMAITRE and the one presented in the video

Can you do a simulation on aluminium round tensile test getting ultimate strengths