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David Mašín

SoilModels Editor; Developer of hypoplastic models and related software tools.

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See https://soilmodels.com/download/vumat_umatinterface-zip/

On Clay and Sand hypoplasticity UMAT and Plaxis implementations, including UMAT-Plaxis interface

Hi Muhammad, thanks for replying. And Wenbo: For clarification, the formula for undrained shear strengh (Eq. 6.22 from the book…

On A question about the hypoplastic model in clay

Hi, 1. "Specific gravity" 16.5 kN/m3 is obviously an error, this is total unit weight. Depth in prototype scale is…

On Problem in calculating Lateral displacement of the pile using Hypoplastic clay model

Hi Ahmad, did you actually scale the applied force by centrifuge scaling laws? The graphs in the paper are shown…

On Problem in calculating Lateral displacement of the pile using Hypoplastic clay model

Hi Alizera, first of all, this Matlab driver is meant for teaching purposes, it is not really a professional modelling…

On Download Package of Matlab Driver

Hi, it is there inside the downloaded folder. Named umat_hcea.for. Rename the name of the subroutine inside to umat. Regards…

On Clay Hypoplasticity (Mašín, 2014)

Hi Ran, even better, thanks. So we probably did it correct :). Regards David

On stress order in hypo umat seems to be incorrect

Hi Ran, thanks for your comment. Actually, you are right, but you are pointing to routine which calculates tensor eigenvalues,…

On stress order in hypo umat seems to be incorrect

Initial conditions should be initialised using sdvini function. You should place it into umat file or into another fortran file…

On Clay and Sand hypoplasticity UMAT and Plaxis implementations, including UMAT-Plaxis interface

Hi Sheng, First of all, can you try to run the simulation with non-zero value of pt (for example, 5…

On Convergence issue of unload of clay consolidation in Abaqus

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