Microinertia and internal variables

TL;DR

This paper investigates the origin of microinertia in micromorphic theories using non-equilibrium thermodynamics, linking it to a thermodynamic equation of state associated with internal variables that behave like mechanical momentum.

Contribution

It introduces a thermodynamic perspective on microinertia, connecting internal variables to mechanical momentum within micromorphic theories.

Findings

Microinertia arises from thermodynamic equations of state.

Internal variables can be interpreted as mechanical momentum.

The thermodynamic framework clarifies microinertia's origin.

Abstract

The origin of microinertia of micromorphic theories is investigated from the point of view of non-equilibrium thermodynamics. In the framework of dual internal variables microinertia stems from a thermodynamic equation of state related to the internal variable with the properties of mechanical momentum.