Dear All,
I am using ISA+HP model in my research and I have encountered some problem when looking into cyclic triaxial test for single element.
The target model was selected from Professor Wichtmann lab test ( TCUI11). This sample is a cyclic test for Karlsruhe fine sand. Also, for sand modelling the ISA+HP model was used (Fuentes, W., Wichtmann, T., Gil, M., & Lascarro, C. (2020). ISA-Hypoplasticity accounting for cyclic mobility effects for liquefaction analysis. Acta Geotechnica, 15(6), 1513-1531.).
Confining pressure is equal 200KPa and deviatoric stress was considered base on sinusoidal loading with Amp=40KPa (100 cycle).
The result of E22 is not desirable and in the curve E22 versus q no loop is observed.
Could you please tell me what is the main wrong in this simulation?
Cyclic Triaxial Test
Related Articles
-
-
Spurious oscillations in calculated accelerations
Piotr Kowalczyk||Constitutive Modelling|2 |
Views 3,870
Hello everyone, I have just a general question how people approach the problem of spurious oscillations generated in dynamic analysis when using nonlinear soil constitutive models. I understand sometimes numerical […] -
Getting started with UMAT for Hypoplastic clay model in ABAQUS
Kanika Lamba||Constitutive Modelling|0 |
Views 4,002
Hello All, I am getting started with implementing UMAT for soil model in ABAQUS. I am planning to use Hypoplastic clay constitutive soil model to simulate the triaxial tests. I […] -
Animating Soil Models – eLearning Project
Gertraud Medicus||Constitutive Modelling|0 |
Views 4,734
Dear all, I am currently writing a proposal for a (small & hopefully nice) eLearning project: Within the project, I would like to create animations related to constitutive modelling. I […] -
SANICLAY-B (2018) how to calculate Dep
Steve Xu||Constitutive Modelling|0 |
Views 3,905
Dear fellows, I have been working on coding SANICLAY-B model (2018) . Now I have one question in terms of this model. But I am stuck now. I have two […] -
MatLab m.file
Ala Aljorany||Constitutive Modelling|6 |
Views 5,029
Hi everyone, I’m trying to simulate a triaxial test by using Matlab, adopting the sand hypoplasticity model with strain softening but so far couldn’t succeed. Would anyone help me with […] -
PLAXIS 2D Embedded Pile Row
BENAN ZAHAWI||Constitutive Modelling|0 |
Views 4,341
PLAXIS 2D require a “Lateral Resistance ” for the embedded pile row. The manuals are not very clear as to what the resistance represents? Is it on friction ( similar […] -
Calibration problem
Abdulaziz Abdelkadr||Constitutive Modelling|2 |
Views 3,849
Dear Prof. David Mašín I am posting the queries I have emailed you as per your advice to post it here. During calibration for the basic hypoplasticity parameters using the […]
Who is Online
No one is online right now
Search SoilModels Website
Recent posts
-
Hardening soil Model UMAT 13.9.2023
-
Problem with VUMAT interface 20.8.2023
-
UMAT and oneAPI compiler issues. (SOLVED…i hope :p) 5.8.2023
-
Oedometric Test Soil Test Plaxis 21.7.2023
-
Problem in simulating CPT using SANISAND04 10.7.2023
-
Problem with UMAT for clay hypoplasticity. Program exiting. 30.6.2023
-
Example of FLAC3D data file 10.6.2023
-
sigini ans sdvini subroutine example for soil model in Abaqus 6.6.2023
-
Presentations from Prague Geotechnical Days 2023 including 29th Prague Geotechical Lecture by Yannis Dafalias 25.5.2023
-
Problem in using Hypoplastic model for sand in Abaqus. 17.5.2023
-
An error in the SANISAND umat runtime 8.5.2023
-
Htypoplastic Model in Miidas GTS NX 25.4.2023
Recent Comments
- Shuo Feng on Download Package of Matlab Driver
- Ajay Jatoliya on SANISAND for FLAC3D Download
- Isma Khabis on Hardening soil Model UMAT
- Anis Kheffache on Hardening soil Model UMAT
- Isma Khabis on Hardening Soil Model in Abaqus
- Fatemeh Safari on Matlab Driver
- KF JIAO on SANISAND Abaqus UMAT and Plaxis implementations
- Abdiel Ramon Leon Bal on Problem in simulating CPT using SANISAND04
- An Zhanng on Problem in simulating CPT using SANISAND04
- Giovanni Ciardi on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Anis Kheffache on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Giovanni Ciardi on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Anis Kheffache on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Giovanni Ciardi on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Anis Kheffache on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Giada Orlando on Problem in using Hypoplastic model for sand in Abaqus.
- Giada Orlando on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
- Giada Orlando on Problem in using Hypoplastic model for sand in Abaqus.
Dear Mehdi,
I was checking the parameters that you reported and I noticed two issues:
1) The mechanical constant 7 is “eio”. You are using 0.842 which is below “eco”, which is not correct. Professor Fuentes reported in his calibration for Karlsruhe fine sand ei0=1.212
2) I do not know which implementation of the HP+ISA model are you using, but usually in the umats of professor Fuentes the friction angle is input in radians, please verify that
One last comment, in order to reproduce the cyclic test results reported in that paper, you should simulate the preloading history of the test (isotropic compression) or initialize tensors h and c as isotropically fully mobilized
Kind regards,
Jose
Dear Jose,
Thank you for your comment.
Yes, the value of maximum void ratio at p=0 was incorrect and modified to ei0=1.212 but the model is so sensitive to phic when the phic=0.56 after few cycles the verical strain dramatically increase while this condition don’t observe in phic=32.6!!