A Large Deformation Multiphase Continuum Mechanics Model for Shock Loading of Lung Parenchyma. Part I: Theory

Abstract

A finite-strain theory of a biphasic mixture, with coupled pore fluid flow and solid skeleton deformation, of a soft porous material has been developed for high strain-rate dynamic loading. The constitutive model is nonlinear elastic and accounts for the compressibility of the pore air. The formulation does not require equivalency of acceleration of pore fluid to that of solid skeleton, but rather allows them to be different. Through implementation of the concept of solid extra stress, the theory is able to distinguish among solid skeleton, pore fluid (air), and total pressures, and similarly among stress tensors for each constituent. General features of the constitutive description are specialized for an application to shock loading of lung parenchyma. This is the first in a series of three reports.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2023
Accession Number
AD1201818

Entities

People

  • John D. Clayton
  • Richard A Regueiro
  • Zachariah T. Irwin

Organizations

  • United States Army
  • University of Colorado

Tags

Fields of Study

  • Engineering

Readers

  • Computational Fluid Dynamics (CFD)
  • Geotechnical Engineering.
  • Mechanical Engineering/Mechanics of Materials.