Behavior of Elastoplastic Auxetic Microstructural Arrays.

Area of Science:

• Continuum mechanics
• Materials science
• Mechanical engineering

Background:

• Periodic microstructural arrays can exhibit auxetic behavior, characterized by a negative Poisson's ratio.
• Understanding the elasto-plastic response of these materials is crucial for their application.
• The interplay between microstructure-induced negative Poisson's ratio and material constituents' behavior needs investigation.

Purpose of the Study:

• To develop and employ a continuum-based micromechanical model for predicting the elasto-plastic behavior of periodic microstructural arrays.
• To investigate the combined effects of negative Poisson's ratio and the elastoplasticity of constituent materials.
• To establish a design methodology for tailoring the properties of two-phase arrays to achieve specific negative Poisson's ratios.

Main Methods:

• A continuum-based micromechanical modeling approach was utilized.
• The model accounts for the elasto-plastic behavior of the constituent materials.
• The analysis focused on periodic microstructural arrays designed to generate negative Poisson's ratios.

Main Results:

• The study successfully predicted the elasto-plastic behavior of microstructural arrays with negative Poisson's ratios.
• The combined influence of auxetic microstructure and constituent material properties was quantified.
• A methodology for designing arrays with targeted negative Poisson's ratios was presented.

Conclusions:

• The developed micromechanical model effectively captures the complex elasto-plastic behavior of auxetic materials.
• The findings provide insights into designing materials with tunable negative Poisson's ratios for specific applications.
• The proposed design methodology facilitates the creation of advanced materials with desired mechanical properties.