Search Results for author: Nikolaos Bouklas

Found 10 papers, 2 papers with code

A review on data-driven constitutive laws for solids

no code implementations6 May 2024 Jan Niklas Fuhg, Govinda Anantha Padmanabha, Nikolaos Bouklas, Bahador Bahmani, WaiChing Sun, Nikolaos N. Vlassis, Moritz Flaschel, Pietro Carrara, Laura De Lorenzis

This review article highlights state-of-the-art data-driven techniques to discover, encode, surrogate, or emulate constitutive laws that describe the path-independent and path-dependent response of solids.

Extreme sparsification of physics-augmented neural networks for interpretable model discovery in mechanics

no code implementations5 Oct 2023 Jan N. Fuhg, Reese E. Jones, Nikolaos Bouklas

Data-driven constitutive modeling with neural networks has received increased interest in recent years due to its ability to easily incorporate physical and mechanistic constraints and to overcome the challenging and time-consuming task of formulating phenomenological constitutive laws that can accurately capture the observed material response.

Model Discovery

Stress representations for tensor basis neural networks: alternative formulations to Finger-Rivlin-Ericksen

no code implementations21 Aug 2023 Jan N. Fuhg, Nikolaos Bouklas, Reese E. Jones

Data-driven constitutive modeling frameworks based on neural networks and classical representation theorems have recently gained considerable attention due to their ability to easily incorporate constitutive constraints and their excellent generalization performance.

Modular machine learning-based elastoplasticity: generalization in the context of limited data

no code implementations15 Oct 2022 Jan N. Fuhg, Craig M. Hamel, Kyle Johnson, Reese Jones, Nikolaos Bouklas

The development of accurate constitutive models for materials that undergo path-dependent processes continues to be a complex challenge in computational solid mechanics.

Reduced order modeling for flow and transport problems with Barlow Twins self-supervised learning

no code implementations11 Feb 2022 Teeratorn Kadeethum, Francesco Ballarin, Daniel O'Malley, Youngsoo Choi, Nikolaos Bouklas, Hongkyu Yoon

Through a series of benchmark problems of natural convection in porous media, BT-AE performs better than the previous DL-ROM framework by providing comparable results to POD-based approaches for problems where the solution lies within a linear subspace as well as DL-ROM autoencoder-based techniques where the solution lies on a nonlinear manifold; consequently, bridges the gap between linear and nonlinear reduced manifolds.

Self-Supervised Learning

Interval and fuzzy physics-informed neural networks for uncertain fields

1 code implementation18 Jun 2021 Jan Niklas Fuhg, Ioannis Kalogeris, Amélie Fau, Nikolaos Bouklas

Partial differential equations involving fuzzy and interval fields are traditionally solved using the finite element method where the input fields are sampled using some basis function expansion methods.

A framework for data-driven solution and parameter estimation of PDEs using conditional generative adversarial networks

1 code implementation27 May 2021 Teeratorn Kadeethum, Daniel O'Malley, Jan Niklas Fuhg, Youngsoo Choi, Jonghyun Lee, Hari S. Viswanathan, Nikolaos Bouklas

This work is the first to employ and adapt the image-to-image translation concept based on conditional generative adversarial networks (cGAN) towards learning a forward and an inverse solution operator of partial differential equations (PDEs).

Computational Efficiency Image-to-Image Translation +1

Local approximate Gaussian process regression for data-driven constitutive laws: Development and comparison with neural networks

no code implementations7 May 2021 Jan Niklas Fuhg, Michele Marino, Nikolaos Bouklas

Hierarchical computational methods for multiscale mechanics such as the FE$^2$ and FE-FFT methods are generally accompanied by high computational costs.

Gaussian Processes regression

The mixed deep energy method for resolving concentration features in finite strain hyperelasticity

no code implementations15 Apr 2021 Jan N. Fuhg, Nikolaos Bouklas

However both DEM and classical PINN formulations struggle to resolve fine features of the stress and displacement fields, for example concentration features in solid mechanics applications.

Numerical Integration

Model-data-driven constitutive responses: application to a multiscale computational framework

no code implementations6 Apr 2021 Jan Niklas Fuhg, Christoph Boehm, Nikolaos Bouklas, Amelie Fau, Peter Wriggers, Michele Marino

Computational multiscale methods for analyzing and deriving constitutive responses have been used as a tool in engineering problems because of their ability to combine information at different length scales.

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