Accession Number : AD1009868


Title :   Finsler-Geometric Continuum Mechanics


Descriptive Note : Technical Report,01 Oct 2015,01 May 2016


Corporate Author : US Army Research Laboratory Aberdeen Proving Ground United States


Personal Author(s) : Clayton, John D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1009868.pdf


Report Date : 01 May 2016


Pagination or Media Count : 72


Abstract : Concepts from Finsler differential geometry are applied toward a theory of deformable continua with microstructure. The general model accounts for finite strains, nonlinear elasticity, and various kinds of structural defects in a solid body. The general kinematic structure of the theory includes macroscopic and microscopic displacement fields (i.e., a multiscale theory) whereby the latter are represented mathematically by the director vector of pseudo-Finsler space, not necessarily of unit magnitude. Variational methods are applied to derive Euler-Lagrange equations for static equilibrium and Neumann boundary conditions. The theory is specialized in turn to physical problems of tensile fracture, shear localization, and cavitation in solid bodies. The pseudo-Finsler approach is demonstrated to be more general than classical approaches and can reproduce phase field solutions when certain simplifying assumptions are imposed. Upon invoking a conformal or Weyl-type transformation of the fundamental tensor, analytical and numerical solutions of representative example problems offer new physical insight into coupling of microscopic dilatation with fracture or slip.


Descriptors :   continuum mechanics , physics , phase transformations , differential geometry


Distribution Statement : APPROVED FOR PUBLIC RELEASE