A Large Deformation Multiphase Continuum Mechanics Model for Shock Loading of Lung Parenchyma: Investigating the Effects of Fluid Viscous Stress
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. Herein, we depart from prior work, which assumed a nearly inviscid pore fluid, and account for the pore fluids viscous effects on its stress.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2023
- Accession Number
- AD1214028
Entities
People
- John D. Clayton
- Richard A Regueiro
- Zachariah T. Irwin
Organizations
- United States Army Research Laboratory
- University of Colorado Boulder