24 Jul 2024
⌛️Influence of time step (Δt) on Euler Forward Integration:
geogebra.org/m/ms2efdup
Use sliders to change Δt and λ*
🔵Analytical solution with adjustable parameter λ*
🔴Numerical approximation with adjustable Δt
⚫️Isotropic compr. test data
#AnimatingSoilModels using @geogebra🙏
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23 Jul 2024
💥There are different formulations for the Critical State Line (CSL) in void ratio e - mean effective stress p' plane. You can try to fit David Reid's critical state data with some formulations:
geogebra.org/m/juqzqg94
Thanks to David for the data 🙏
#AnimatingSoilModels
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4 May 2024
🙀📈1D hypoplastic model: geogebra.org/m/c76xptcc
different loading & unloading behavior from a single equation
loading:
σ=0 -> stiffness=E
σ=σ_max, Δε = |Δε| -> stiffness=0
unloading:
σ=σ_max, Δε= -|Δε| -> stiffness=2E
#AnimatingSoilModels using @geogebra🧮🙏
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7 Apr 2024
🪩 -> 💫
Part II of the response envelopes with hypoplasticity (von Wolffersdorff, 1996). You can vary the parameters and also see how the current stress state affects the response envelope.
#AnimatingSoilModels using @geogebra 🧮
LINK: geogebra.org/m/qrdw2sas
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1 Apr 2024
💫Response envelopes are a good graphical way of checking constitutive equations.
🟡They are also useful for showing that hypoplasticity is just an elastic model L : ε̇ shifted by N ||ε̇||:
σ̇ = L : ε̇ N ||ε̇||
#AnimatingSoilModels using @geogebra
LINK: geogebra.org/m/nxnbfddh
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12 Jan 2024
⭕️🪨You can use the sliders to vary the Mohr-Coulomb parameters c and φ. You can also reduce the minor principal stress σ₃ for a given σ₁=-100 kPa until the MC failure criterion is reached. #AnimatingSoilModels, once again created with @geogebra 🧮:
soilmodels.com/wp-content/up…
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31 Dec 2023
🥱I reduced sliders for clarity, but it's a bit boring now. Planning to bring slightly more excitement to #AnimatingSoilModels in 2024! Happy New Year, everyone!
➖➕geotech sign convention: soilmodels.com/wp-content/up…
mech sign convention: soilmodels.com/wp-content/up…
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31 Dec 2023
🎆Finishing 2023 with @geogebra 🧮 and #AnimatingSoilModels
This figure might help illustrate the link between Mohr’s circles and stress paths, using a cd compr test. The MC failure line (c=0) is shown and the stress state can be adjusted with the slider:
soilmodels.com/wp-content/up…
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19 Dec 2023
haha, @geogebra is already famous and has sooo much potential to be used in engineering education, not just for #AnimatingSoilModels
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🌏📈 Take a look at how #GeoGebra is used in Geotechnical Engineering
#AnimatingSoilModels #GeoGebra #geotechnics
14 Mar 2022
In cooperation with Mahdi Taiebat|@mtaiebat, we created a SANISAND-subpage of #AnimatingSoilModels, where we focus on SANISAND-MSf by @MingYang09|Yang, Taiebat & Dafalias (2022).
You can find interactive graphics, an animation and Matlab scripts here: soilmodels.com/soilanim/#lin…
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18 Dec 2023
I missed #AnimatingSoilModels.
So I visualised Mohr's circle with @geogebra. In the interactive figure you can vary the radius and move point A and centre point C:
soilmodels.com/soilanim/#lin…
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23 Feb 2023
Thanks to @PaniaNewell, I could once again present #AnimatingSoilModels.
It was a pleasure to meet you & your students!
23 Feb 2023
Thanks to Dr. Gertraud Medicus for talking to my students about her amazing tools to visualize different constitutive models.
#interactivelearning #plasticity #modeling Leopold-Franzens Universität Innsbruck #students
#visualization #mechanics InterPore…lnkd.in/g5HSvjh8
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25 Jan 2023
😕 Unfortunately, I have not made any tool to visualize Mohr's circles. This has been on my to-do list for a long time and I have not yet(?) done it.
I clearly need part 2 of #AnimatingSoilModels, but I can't promise when that will happen.
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14 Mar 2022
In cooperation with Mahdi Taiebat|@mtaiebat, we created a SANISAND-subpage of #AnimatingSoilModels, where we focus on SANISAND-MSf by @MingYang09|Yang, Taiebat & Dafalias (2022).
You can find interactive graphics, an animation and Matlab scripts here: soilmodels.com/soilanim/#lin…
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11 Feb 2022
This is the State Boundary Surface of the MCC Model.
You can use sliders, vary the value for the p’₀ and display the corresponding yield surface:
soilmodels.com/wp-content/up…
The figure is created using @GeoGebra within the project #AnimatingSoilModels
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5 Feb 2022
(2/2)
This illustration aims to give students a better understanding of stress space, the deviatoric plane, and stress invariants. They can also rotate the 3D figure, use slider, check out invariants, ...
[And I am still #AnimatingSoilModels 🙃]
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22 Jan 2022
I've always wanted to try @geogebra. And some of you asked for sliders for parameter variation related to hypoplasticity & #AnimatingSoilModels.
This is my first @geogebra draft of the bounding surface of hypoplasticity.
(some things will be improved)
⬇️
geogebra.org/m/r8n9kesw
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3 Dec 2021
(1/3) Last week was officially the last week of the #AnimatingSoilModels project. I'm taking this as an opportunity to copy and paste the acknowledgement from soilmodels.com/soilanim:
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4 Nov 2021
Just a short update:
The project #AnimatingSoilModels is not finished and there are things in development.
AND: I'm not working on it alone, but in collaboration with others: on small-strain stiffness, bounding surface plasticity, ...
More to come soon, at least in 2021 ;-)
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23 Feb 2021
Undrained triaxial (cu) compression tests simulated with clay hypoplasticity (Mašín, 2013). The animation shows the influence of the initial stress level by keeping the initial void ratio. --more about #AnimatingSoilModels & hypoplasticity on friday...
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