L30 Mohr-Coulomb, Dracker-Prager, and Modified Lade yield criteria

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Lecture 30 of PGE 383 (Fall 2020) Advanced Geomechanics at The University of Texas at Austin delivered on 2020/10/28 by DN Espinoza ( / dnegeomechanics .
Topics: stress-sensitive yield criteria, frictional strength, Mohr-Coulomb failure criterion, extension to Drucker-Prager and modified Tresca, axisymmetric triaxial tests, modified Lade criterion.
More about the triaxial tests: Section 4.3.4 in dnicolasespinoza.github.io/

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27 окт 2020

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Комментарии : 19

@jhonathanhenaoossa2828 8 месяцев назад

Clear lecture professor Espinoza.... useful for my class on mechanical behavior!

@loknathdas3111 2 года назад

Best lecture on youtube. so much clarity in the explanation, thank you vary much

@clem5474 10 месяцев назад

Master class.. 👏👏

@MacCionnaith 2 года назад

Thank you so much!

@JosueA_455 11 месяцев назад

Context - Minute 15.20. How would you explain that from s1 in the M-C plot the characteristic angle can be found in the counterclockwise direction whereas it is clockwise in the 2D representation?

@dnicolasespinoza5258 11 месяцев назад

I don't think it in terms of clockwise or counterclockwise, I think it always as going from the point/plane of sigma_1 to point/plane of sigma_3 (or any other principal stresses). It never fails.

@karlmartinsmusic 3 года назад

Good morning, professor. Your lectures are amazing. Do your lectures follow any book? Could you recommend one? Best regards.

@dnicolasespinoza5258 3 года назад

Hi, I have a video describing the main books I follow: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-sevuKho0QwQ.html . There are some advanced topics that have been covered in very recent papers. Click "SHOW MORE" in the corresponding video and you will find the citations for the papers I refer to in that lecture, if any. Thanks for watching!

@loknathdas3111 2 года назад

sir, can you please, upload videos comparing mohr coulomb and Cam Clay model

@marembomicheal176 3 года назад

Hello prof. Thank you so much for the educative series. Is there a way I can implement this failure criteria in comsol or any geomechanics of a rock. Any link guiding me on how to implement in comsol would be helpful. Thank you

@dnicolasespinoza5258 3 года назад

Yes, you can: www.comsol.com/blogs/how-to-implement-elastoplasticity-in-a-model-using-external-materials/ . However, this might an "additional" package the requires a license upgrade.

@suryaprasanthmuddana7038 2 года назад

sir one doubt...how can we draw simply a circle on hydrostatic axis in drucker prager ? you said it should be symmetric with hydrostatic axis then why only circle ? please clarify sir.

@dnicolasespinoza5258 2 года назад

It is not a single circle, it is a conical surface in the principal-stress-space where the cone axis coincides with the hydrostatic axis. The circle is just a cross-section of the cone with a plane perpendicular to the hydrostatic axis. I hope this helps.

@kouroshgashtil2989 2 года назад

Thanks for the video , Do you have any video about lode angle and STRESS Triaxiality on your channel? If not , Would you please do me a favor and explain a bit about them? thank you.

@dnicolasespinoza5258 2 года назад

Hi, I talk about stress invariants here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JEPGl2bpQmY.html . I don't mention the Lode angle but have added it to my list of future videos. Thanks for the suggestion!

@0713059059 3 года назад

Hi Professor. How the behaviour of rock vary from the behaviour of soils? Are there any differences using these constitutive models for soil?

@dnicolasespinoza5258 3 года назад

The main difference is cementation which provides rock with cohesive strength. In general, all materials have a tension limit, compression yield cap, and some frictional strength. Tresca and von Mises (for metals), are a particular case of Drucker-Prager/Lade (rocks), which in turn are a particular case of more advanced models like Cam-Clay or Kayenta (for soil and rock/soil at high stresses). Which model you choose depends on the range of your stresses and what kind of inelasticity you want to capture.

@0713059059 3 года назад

@@dnicolasespinoza5258 Your explanation makes sense. Love your channel. Keep posting!