Accession Number : ADA262449


Title :   Plastic Deformation of Granular Materials


Descriptive Note : Final rept. 1 Dec 89-30 Nov 92


Corporate Author : STATE UNIV OF NEW YORK AT ALBANY RESEARCH FOUNDATION


Personal Author(s) : Pitman, E B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262449.pdf


Report Date : 25 Jan 1993


Pagination or Media Count : 13


Abstract : This project combines analytic and computational investigations to understand the dynamics of elastic-plastic deformation of granular materials, particularly issues related to the formation of shearbands. Roughly speaking, shearbands form when the governing equations cease to be wellposed. Our research examines the issue of well-posedness, loss of hyperbolicity, and regularization. This final report summarizes our work on (1) computation of deformation and formation of shear bands in granular material; (1) analysis of a gradient theory of granular plasticity; (2) related elastic and viscoelastic systems of PDE which may lose hyperbolicity.... Granular material, Plastic deformation, Hyperbolic equations.


Descriptors :   *PLASTIC DEFORMATION , *GRANULAR MATERIALS , SHEAR PROPERTIES , COMPUTATIONS , DYNAMICS , MATERIALS , DEFORMATION , THEORY , ELASTIC PROPERTIES , PLASTIC PROPERTIES , LOSSES , EQUATIONS , VISCOSITY , HYPERBOLIC DIFFERENTIAL EQUATIONS , GRADIENTS


Subject Categories : Laminates and Composite Materials
      Theoretical Mathematics
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE