Deterministic and statistical calibration of constitutive models from full-field data with parametric physics-informed neural networks

TL;DR

This paper introduces a physics-informed neural network approach for fast, accurate calibration of constitutive models from full-field data, enabling near real-time structural health monitoring and uncertainty quantification.

Contribution

The paper presents a novel parametric PINN framework for efficient, real-time calibration of constitutive models from full-field data, including uncertainty quantification with Bayesian inference.

Findings

High accuracy in deterministic calibration of elastic and hyperelastic models

Valid uncertainty estimates from Bayesian inference

Calibration results agree well with finite element methods

Abstract

The calibration of constitutive models from full-field data has recently gained increasing interest due to improvements in full-field measurement capabilities. In addition to the experimental characterization of novel materials, continuous structural health monitoring is another application that is of great interest. However, monitoring is usually associated with severe time constraints, difficult to meet with standard numerical approaches. Therefore, parametric physics-informed neural networks (PINNs) for constitutive model calibration from full-field displacement data are investigated. In an offline stage, a parametric PINN can be trained to learn a parameterized solution of the underlying partial differential equation. In the subsequent online stage, the parametric PINN then acts as a surrogate for the parameters-to-state map in calibration. We test the proposed approach for the deterministic least-squares calibration of a linear elastic as well as a hyperelastic constitutive model from noisy synthetic displacement data. We further carry out Markov chain Monte Carlo-based Bayesian inference to quantify the uncertainty. A proper statistical evaluation of the results underlines the high accuracy of the deterministic calibration and that the estimated uncertainty is valid. Finally, we consider experimental data and show that the results are in good agreement with a finite element method-based calibration. Due to the fast evaluation of PINNs, calibration can be performed in near real-time. This advantage is particularly evident in many-query applications such as Markov chain Monte Carlo-based Bayesian inference.