Search Results for author: Ran Ma

Found 3 papers, 0 papers with code

MD-inferred neural network monoclinic finite-strain hyperelasticity models for $β$-HMX: Sobolev training and validation against physical constraints

no code implementations29 Nov 2021 Nikolaos N. Vlassis, Puhan Zhao, Ran Ma, Tommy Sewell, WaiChing Sun

We present a machine learning framework to train and validate neural networks to predict the anisotropic elastic response of the monoclinic organic molecular crystal $\beta$-HMX in the geometrical nonlinear regime.

Transfer Learning

Equivariant geometric learning for digital rock physics: estimating formation factor and effective permeability tensors from Morse graph

no code implementations12 Apr 2021 Chen Cai, Nikolaos Vlassis, Lucas Magee, Ran Ma, Zeyu Xiong, Bahador Bahmani, Teng-Fong Wong, Yusu Wang, WaiChing Sun

Comparisons among predictions inferred from training the CNN and those from graph convolutional neural networks (GNN) with and without the equivariant constraint indicate that the equivariant graph neural network seems to perform better than the CNN and GNN without enforcing equivariant constraints.

Geometric deep learning for computational mechanics Part I: Anisotropic Hyperelasticity

no code implementations8 Jan 2020 Nikolaos Vlassis, Ran Ma, WaiChing Sun

To ensure smoothness and prevent non-convexity of the trained stored energy functional, we introduce a Sobolev training technique for neural networks such that stress measure is obtained implicitly from taking directional derivatives of the trained energy functional.

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