A Large Deformation Multiphase Continuum Mechanics Model for Shock Loading of Lung Parenchyma. Part 2: Numerical Methods
Abstract
A 1-D numerical implementation of a finite-strain theory of a biphasic mixture is described. The theory includes coupled pore fluid flow and solid skeleton deformation for a soft porous material applicable to high strain-rate dynamic loading. The constitutive model is nonlinear elastic and accounts for the compressibility of the pore air. The treatment 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 report, which focuses on the finite-element formulation of the theory and constitutive models, is the second in a series of three reports.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2023
- Accession Number
- AD1201815
Entities
People
- John D. Clayton
- Richard A Regueiro
- Zachariah T. Irwin
Organizations
- United States Army Research Laboratory