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Related Experiment Video

Updated: Sep 21, 2025

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes

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Published on: December 13, 2016

Nonlinear Rheological Processes Modeling in Three-Layer Plates with a Polyurethane Foam Core.

Anton Chepurnenko¹

¹Strength of Materials Department, Faculty of Civil and Industrial Engineering, Don State Technical University, Rostov-on-Don 344000, Russia.

|May 28, 2022

Summary

This study introduces a new method for calculating the bending of three-layer panels, considering the nonlinear creep of polyurethane foam. Accounting for this nonlinear creep is crucial for accurate stress analysis in sandwich panels.

Keywords:

Maxwell–Gurevich equation creep nonlinearity numerical simulation polyurethane foam sandwich panels three-layer plate

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Area of Science:

Materials Science
Structural Engineering
Computational Mechanics

Background:

Three-layer panels with polyurethane foam are common in construction.
Accurate structural analysis is vital for their performance and safety.

Purpose of the Study:

Develop a calculation method for three-layer plate bending.
Incorporate the nonlinear creep behavior of the polyurethane foam core.

Main Methods:

Utilized the non-linear Maxwell-Gurevich equation for polyurethane foam creep.
Employed the finite difference and Euler methods in MATLAB for numerical solutions.
Derived an analytical solution for hinged plates.

Main Results:

Verified the model against ANSYS software.
Revealed significant effects of nonlinear creep absent in linear analysis.
Observed time-varying stresses in faces and filler due to nonlinear creep.

Conclusions:

Nonlinear creep significantly alters stress distribution over time in sandwich panels.
Stresses in the faces increase initially then return to original values.
Stresses in the polyurethane foam filler initially decrease.
Accurate calculation of sandwich panels requires accounting for nonlinear creep.