Dear all,
I want to implement a new user element using the UEL subroutine. To simulate dynamic cases, one has to define the mass, damping and stiffness matrix then build the RHS and AMATRIX as defined by abaqus.
The stiffness matrix K is obtained by integrating the material tangent matrxis (DDSDDE) over the element’s volume.
My questions are the following:
-UEL having no argument for stress and strain (STRESS,STRAN…Dstran), do i have to define them my self? (by derivative of the displacements U,DU ?
-The tangent material matrix (DDSDDE) being strain and stress dependent, i need to define the stresses and strains in the UEL, then i need to call the UMAT to return DDSDDE. Do i also have to perform Newton raphson itterations to correct for non linearity? (in umat this would have been done by abaqus itself, but when i call umat inside uel i am not sure…)
Abaqus UEL Hypoplasticity
Related Articles
-
Hypoplasticity & Recent Stress History
Hashmi Sohawon||Constitutive Modelling|2 |Views 4,219
Hi David, Can you please provide some comments on the ability of the Hypoplasticity model with intergranular strain concept to model the effects of recent stress history on the clay […] -
Constitutive Model for clayey sand Soils Considering the Effect of Intergranular Physicochemical Forces
Mehdi Ghatei||Constitutive Modelling|0 |Views 4,083
Hi all, I’m doing some experimental work to investigate the salinity effect on clayey sand behaviour. Is there any constitutive model considering the physicochemical forces for such materials? Regards, Mehdi -
UMAT for strain-rate effects
Luis Zambrano-Cruzatty||Constitutive Modelling|0 |Views 3,956
Dear community, I’m interested in constitutive models that can handle strain-rate effects for HSR on sands for simulating free fall penetration. I would appreciate any help. Do you know any […] -
Papers on Excalibre
David Mašín||Constitutive Modelling|0 |Views 4,479
Hi all, Details of Excalibre software (https://soilmodels.com/excalibre) functionality and calibration procedure have been published in two papers, which are now available online at the webpages of publisher (https://link.springer.com/article/10.1007%2Fs11440-021-01441-0 and https://link.springer.com/article/10.1007%2Fs11440-021-01435-y). […] -
Problem in using Hypoplastic model for sand in Abaqus.
isma khabis||Constitutive Modelling|16 |Views 1,919
Hello, I am using the UMAT code for sand hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/. I am simulating Axisymmetric condition in Abaqus. To check the results given by the […] -
Getting started with UMAT for Hypoplastic clay model in ABAQUS
Kanika Lamba||Constitutive Modelling|0 |Views 4,357
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 […] -
Problems with the UMAT subroutine check_parms_DM of the SANISAND constitutive model
meng xiaowei||Constitutive Modelling|3 |Views 4,367
Where can I find the source of the content in the picture below in the UMAT subroutine check_parms_DM of the SANISAND constitutive model? -
Rate dependent plastic yield in Tochnog Question
Marlon Hahn||Constitutive Modelling|0 |Views 3,997
Hi, I am new to Tochnog and really appreciate the open source modeling chain (gmsh->Tochnog->paraview). So far, I’m only familiar with commercial codes, e.g. Abaqus. I actually deal with metal […]
0 Comments
Who is Online
No one is online right now
Search SoilModels Website
Recent posts
- Degradation ( disturbance ) of hypoplastic clay 23.4.2024
- Degradation ( disturbance ) of hypoplastic clay 23.4.2024
- Paper of Coulomb, C. A. (1773) 15.4.2024
- ABAQUS UMAT of hypoplastic clay model 6.4.2024
- Prague Geotechnical Days 2024 “Geotechnical monitoring” and 30th jubilee Prague Geotechnical Lecture by prof. Eduardo Alonso 5.4.2024
- UMAT for Creep-SCLAY model. 1.3.2024
- Cyclic tests with Triax element test driver 14.2.2024
- SUMMER SCHOOL ‘Numerical Modelling in Geotechnical Engineering’, Innsbruck – July 22nd-26th, 2024 1.2.2024
- COURSE IN SOIL MODELING – NTNU, Trondheim – October 14th to 18th, 2024 21.12.2023
- MSE walls design in Plaxis 11.12.2023
- sand liquefaction modelling in Anura3D 8.12.2023
- BCV bentonite experimental and modelling datasets 14.11.2023
Recent Comments
- Jh Xue on Undrained Tests with Clay Hypoplasticity Intergranular
- Zhentao Liu on Problem in simulating CPT using SANISAND04
- Gertraud Medicus on ABAQUS UMAT of hypoplastic clay model
- Chen Zhiming on Download Package of Charles University Implementation of High Cycle Accumulation Model
- Konstantinos Chatzis on Cyclic tests with Triax element test driver
- Abhay Pratap Singh on Cyclic tests with Triax element test driver
- Giovanni Ciardi on Cyclic tests with Triax element test driver
- Konstantinos Chatzis on Cyclic tests with Triax element test driver
- Ismail Khan on Cyclic tests with Triax element test driver
- Kanika Lamba on Cyclic tests with Triax element test driver
- Arie Koot on How to model the settlement in soil due to water drawdown.
- Konstantinos Chatzis on Cyclic tests with Triax element test driver
- Jose Duque on Cyclic tests with Triax element test driver
- MohamadReza Kamali on How to model the settlement in soil due to water drawdown.
- Leo Alibert on MSE walls design in Plaxis
- Ignacio Zuloaga on MSE walls design in Plaxis
- Giada Orlando on Problem with VUMAT interface
- Michael Spyridis on Problem with VUMAT interface