*MAT_MOHR_COULOMB model
chunyangcsu
James M. Kennedy
Dear CY,
See if this is of some help:
This thesis was a numerical study into the effects of explosion on embankment dams using the high fidelity physics based finite element package, LS-DYNA. A numerical model was developed in LS-DYNA and validated using field testing. *MAT_016 and *MAT_173 (data included) were evaluated and compared in the modeling for the soil embankment. In modelling the explosive, the keyword that was used was the *HIGH_EXPLOSIVE_BURN with the Jones-Wilkins-Lee Equation of State (EOS). The explosive charge masses used in the experiments were 25 kg, 50 kg and 100 kg of Ammonium Nitrate Fuel Oil (ANFO). The *MAT_HIGH_EXPLOSIVE_BURN allowed for a point of detonation to be selected and also for a time of detonation to be specified. A mesh sensitivity was also made for the 50 kg mass charge of ANFO:
Afriyie, G.A., "Effects of Explosions on Embankment Dams", Master’s Thesis, Department of Civil Engineering, Carleton University, Ottawa, Ontario, Canada, 2014.
*MAT_159 was used to represent the shotcrete seal component while *MAT_173 was used to represent the coal roof, coal floor and coal ribs components in a coal mine explosive simulation (following two papers):
Mutton, V.S., and Remennikov, A.M. "Designing Explosion Rated Ventilation Seals for Coal Mines Using High-Fidelity Physics-Based Computer Modelling", 10th Underground Coal Operators' Conference, Paper 313, pp. 312-325, Wollongong, New South Wales, Australia, February, 2010.
http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1974&context=coal
Remennikov, A.M., and Mutton, V.S., "High-Fidelity Physics-Based Modelling of Explosion Seals for Coal Mines", The 5th Civil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference, Sydney, Australia, August, 2010.
http://mail.poly.ac.mw/cesar/Full%20Papers/320.pdf
This thesis aimed to compare the high-pressure, quasi-static compaction behaviour of sandy soils, and to investigate how this behaviour was affected by changes in strain rate and moisture content. LS-DYNA soil material models *MAT_005. *MAT_016, *MAT_025, *MAT_079, and *MAT_173 (data included) were validated using SHPB experiments and evaluated for sandy soils. None were found to be fully acceptable for this study:
Mohr–Coulomb (∗MAT_173) A Mohr–Coloumb yield surface defined using a value for cohesion and angle of friction. The dilation angle is used to define a nonassociated flow rule, and both φ and ψ can vary with plastic strain.
Barr, A., "Strain-Rate Effects in Quartz Sand", Ph.D. Thesis, Department of Civil and Structural Engineering, University of Sheffield, Sheffield, England, United Kingdom, August, 2016.
The soil behaviour (data included) was modelled using the Mohr-Coulomb model (*MAT_173):
Burggraaf, H.G., Vervuurt, A.H.J.M., and Weerheijm, J., "Full System Response Thomassen Tunnel under Impact Load Using LS-DYNA (Concept Version 3)", External TNO Report, Delft Cluster, December, 2009.
http://repository.tudelft.nl/view/ir/uuid:38455304-7713-478c-837b-815424cdd257/
It was attempted within this research to study numerically the response of a typical rock, namely “Pietra Serena” sandstone, under unconfined compression test. As an affordable and alternative to expensive field testing the automatic input generator material keyword, K&C (*MAT_072R3), was used. In order to study this model’s capabilities and limitations, it was compared the conventional Mohr-Coulomb (*MAT_173) model:
Mardalizad, A., Manes, A., and Giglo, M., "An Investigation in Constitutive Models for Damage Simulation of Rock Material", AIAS 2016-685, 45th Convegno Nazionale, Società Scientifica Italiana di Progettazione Meccanica e Costruzione di Macchine, Trieste, Italy, September, 2016.
Sincerely,
James M. Kennedy
KBS2 Inc.
March 20, 2022
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James M. Kennedy
p.s. Further details of Mohr Coulomb
Abbo, A.J., and Sloan, S.W., "A Smooth Hyperbolic Approximation to the Mohr-Coulomb Yield Criterion", Journal of Computers and Structures, Vol. 54, Issue 3, pp. 427-441, February, 1995.
Lewis, B.A., "Developing and Implementing a Road Side Safety Soil Model into LS-DYNA", Federal Highway Administration, Turner-Fairbank Highway Research Center, McLean, Virginia, 1999.
Evaluation and users manuals funded by FHWA for *MAT_147:
Reid, J.D., Coon, B.A., Lewis, B.A., Sutherland, S.H., and Murray, Y.D., "Evaluation of LS-DYNA Soil Material Model 147", FHWA-HRT-04-094, Federal Highway Administration, Turner-Fairbank Highway Research Center, McLean, Virginia, November 2004.
http://www.fhwa.dot.gov/publications/research/safety/04094/
http://www.fhwa.dot.gov/publications/research/safety/04094/04094.pdf
To view this discussion on the web visit https://groups.google.com/d/msgid/ls-dyna2/000801d83c71%24dda3a510%2498eaef30%24%40kbs2.com.
James M. Kennedy
Dear CY,
See if this works better:
Sincerely,
James M. Kennedy
KBS2 Inc.
March 21, 2022
To view this discussion on the web visit https://groups.google.com/d/msgid/ls-dyna2/001101d83c72%24f9b5d010%24ed217030%24%40kbs2.com.