A hybrid approach to simulate the homogenized irreversible elastic-plastic deformations and damage of foams by neural networks

TL;DR

This paper introduces a hybrid neural network method embedded in plasticity models to efficiently simulate complex irreversible elastic-plastic deformation and damage in foam structures, combining homogenization accuracy with computational efficiency.

Contribution

The paper presents a novel hybrid approach (HyMNNA) that integrates neural networks into rate-independent plasticity models for simulating irreversible material behavior.

Findings

Efficient simulation of anisotropic elastic-plastic foam behavior

Neural networks accurately model yield and evolution of internal variables

Method reduces computational cost compared to traditional homogenization

Abstract

Classically, the constitutive behavior of materials is described either phenomenologically, or by homogenization approaches. Phenomenological approaches are computationally very efficient, but are limited for complex non-linear and irreversible mechanisms. Such complex mechanisms can be described well by computational homogenization, but respective FE$^2$ computations are very expensive. As an alternative way, neural networks have been proposed for constitutive modeling, using either experiments or computational homogenization results for training. However, the application of this method to irreversible material behavior is not trivial. The present contribution presents a hybrid methodology to embed neural networks into the established framework of rate-independent plasticity. Both, the yield function and the evolution equations of internal state variables are represented by neural networks. Respective training data for a foam material are generated from RVE-simulations under monotonic loading. It is demonstrated that this hybrid multi-scale neural network approach (HyMNNA) allows to simulate efficiently even the anisotropic elastic-plastic behavior of foam structures with coupled anisotropic evolution of damage and non-associated plastic flow.