# Space/time global/local noninvasive coupling strategy: Application to viscoplastic structures

## TL;DR

This paper extends a non-invasive global/local coupling method to large, nonlinear viscoplastic structures, proposing strategies to handle different time grids for improved accuracy and efficiency, demonstrated on 2D and 3D industrial examples.

## Contribution

It introduces and compares two non-invasive coupling strategies for viscoplastic models with different time grids, enhancing simulation precision and performance.

## Key findings

- Strategies improve accuracy over monolithic approaches
- Methods are effective on 2D and 3D complex structures
- Different time grids are essential for legacy code compatibility

## Abstract

The purpose of this paper is to extend the non-invasive global/local iterative coupling technique [15] to the case of large structures undergoing nonlinear time-dependent evolutions at all scales. It appears that, due to the use of legacy codes, the use of different time grids at the global and local levels is mandatory in order to reach a satisfying level of precision. In this paper two strategies are proposed and compared for elastoviscoplastic models. The questions of the precision and performance of those schemes with respect to a monolithic approach is addressed. The methods are first exposed on a 2D example and then applied on a 3D part of industrial complexity.