Geometric learning for computational mechanics Part II: Graph embedding for interpretable multiscale plasticity

NN Vlassis, WC Sun - Computer Methods in Applied Mechanics and …, 2023 - Elsevier
The history-dependent behaviors of classical plasticity models are often driven by internal
variables evolved according to phenomenological laws. The difficulty to interpret how these …

Hydromechanical modeling of solid deformation and fluid flow in the transversely isotropic fissured rocks

Q Zhang - Computers and Geotechnics, 2020 - Elsevier
Geomaterials containing fissures such as some sedimentary rocks often exhibit a bimodal
pore size distribution, and they are also inherently anisotropic due to the distinct bedding …

A kd-tree-accelerated hybrid data-driven/model-based approach for poroelasticity problems with multi-fidelity multi-physics data

B Bahmani, WC Sun - Computer Methods in Applied Mechanics and …, 2021 - Elsevier
We present a hybrid model/model-free data-driven approach to solve poroelasticity
problems. Extending the data-driven modeling framework originated from Kirchdoerfer and …

Data-driven discovery of interpretable causal relations for deep learning material laws with uncertainty propagation

X Sun, B Bahmani, NN Vlassis, WC Sun, Y Xu - Granular Matter, 2022 - Springer
This paper presents a computational framework that generates ensemble predictive
mechanics models with uncertainty quantification (UQ). We first develop a causal discovery …

A non-cooperative meta-modeling game for automated third-party calibrating, validating and falsifying constitutive laws with parallelized adversarial attacks

K Wang, WC Sun, Q Du - Computer Methods in Applied Mechanics and …, 2021 - Elsevier
The evaluation of constitutive models, especially for high-risk and high-regret engineering
applications, requires efficient and rigorous third-party calibration, validation and …

Phase field modeling of frictional slip with slip weakening/strengthening under non-isothermal conditions

EC Bryant, WC Sun - Computer Methods in Applied Mechanics and …, 2021 - Elsevier
Abstract Cracks, veins, joints, faults, and ocean crusts are strong discontinuities of different
length scales that can be found in many geological formations. While the constitutive laws …

Nonlocal regularized numerical analyses for passive failure of tunnel head in strain-softening soils

D Xue, X Lü, M Huang, KW Lim - Computers and Geotechnics, 2022 - Elsevier
This work looks into the passive failure of tunnel head in strain-softening soils modeled
using a nonlocal constitutive model. The Drucker–Prager yield criterion and plastic potential …

A finite micro-rotation material point method for micropolar solid and fluid dynamics with three-dimensional evolving contacts and free surfaces

R Ma, WC Sun - Computer Methods in Applied Mechanics and …, 2022 - Elsevier
This paper introduces an explicit material point method designed specifically for simulating
the micropolar continuum dynamics in the finite deformation and finite microrotation regime …

Multiscale plasticity of geomaterials predicted via constrained optimization‐based granular micromechanics

EC Bryant, KC Bennett, NA Miller… - International Journal for …, 2022 - Wiley Online Library
A general framework to derive nonlinear elastic and elastoplastic material models from
granular micromechanics is proposed, where a constraint‐based variational structure is …

Implicit gradient softening plasticity for the modeling of strain localization in soils

X Lü, D Xue, KW Lim - Computer Methods in Applied Mechanics and …, 2020 - Elsevier
A non-associative implicit gradient pressure-dependent softening plasticity model and its
numerical implementation are presented to capture strain localization in soils. The …