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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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Constitutive model for plasticity in an amorphous polycarbonate.

A Fortunelli¹, M Ortiz

¹Molecular Modeling Laboratory, Istituto per i Processi Chimico-Fisici del C.N.R., v. G. Moruzzi, 1-56124, Pisa, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|November 13, 2007

Summary

A new constitutive model describes polycarbonate

Area of Science:

Materials Science
Solid Mechanics
Polymer Physics

Background:

Amorphous glassy polymers like polycarbonate exhibit complex mechanical behaviors under stress.
Accurate modeling of these behaviors is crucial for predicting material performance and failure.

Purpose of the Study:

To propose a novel constitutive model for amorphous glassy polycarbonate.
To accurately capture the material's elastic and plastic responses.

Main Methods:

Development of a model based on an isotropic elastic phase and a continuum of plastic phases.
Approximation of relaxed energy using physical considerations and numerical testing.
Introduction of rate-independent viscoplasticity to account for kinetic effects.

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Main Results:

The model demonstrates ideal elastic-plastic behavior.
It successfully captures key features of amorphous glassy polycarbonate's plastic deformation.
Comparison with experimental data validates the model's predictive capabilities.

Conclusions:

The proposed constitutive model provides a robust framework for understanding polycarbonate's mechanical response.
It offers a valuable tool for material design and performance analysis in engineering applications.