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Title: KAYENTA: Theory and User's Guide

Abstract

The physical foundations and domain of applicability of the Kayenta constitutive model are presented along with descriptions of the source code and user instructions. Kayenta, which is an outgrowth of the Sandia GeoModel, includes features and fitting functions appropriate to a broad class of materials including rocks, rock-like engineered materials (such as concretes and ceramics), and metals. Fundamentally, Kayenta is a computational framework for generalized plasticity models. As such, it includes a yield surface, but the term (3z(Byield(3y (Bis generalized to include any form of inelastic material response (including microcrack growth and pore collapse) that can result in non-recovered strain upon removal of loads on a material element. Kayenta supports optional anisotropic elasticity associated with joint sets, as well as optional deformation-induced anisotropy through kinematic hardening (in which the initially isotropic yield surface is permitted to translate in deviatoric stress space to model Bauschinger effects). The governing equations are otherwise isotropic. Because Kayenta is a unification and generalization of simpler models, it can be run using as few as 2 parameters (for linear elasticity) to as many as 40 material and control parameters in the exceptionally rare case when all features are used. For high-strain-rate applications, Kayenta supports rate dependencemore » through an overstress model. Isotropic damage is modeled through loss of stiffness and strength.« less

Authors:
 [1];  [2];  [3];  [4];  [3]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Orbital ATK Inc., Magna, UT (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. BP America, Inc., Houston, TX (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
ARL; USDOE
OSTI Identifier:
1238100
Report Number(s):
SAND2015-0803
603532
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Brannon, Rebecca Moss, Fuller, Timothy Jesse, Strack, Otto Eric, Fossum, Arlo Frederick, and Sanchez, Jason James. KAYENTA: Theory and User's Guide. United States: N. p., 2015. Web. doi:10.2172/1238100.
Brannon, Rebecca Moss, Fuller, Timothy Jesse, Strack, Otto Eric, Fossum, Arlo Frederick, & Sanchez, Jason James. KAYENTA: Theory and User's Guide. United States. doi:10.2172/1238100.
Brannon, Rebecca Moss, Fuller, Timothy Jesse, Strack, Otto Eric, Fossum, Arlo Frederick, and Sanchez, Jason James. Sun . "KAYENTA: Theory and User's Guide". United States. doi:10.2172/1238100. https://www.osti.gov/servlets/purl/1238100.
@article{osti_1238100,
title = {KAYENTA: Theory and User's Guide},
author = {Brannon, Rebecca Moss and Fuller, Timothy Jesse and Strack, Otto Eric and Fossum, Arlo Frederick and Sanchez, Jason James},
abstractNote = {The physical foundations and domain of applicability of the Kayenta constitutive model are presented along with descriptions of the source code and user instructions. Kayenta, which is an outgrowth of the Sandia GeoModel, includes features and fitting functions appropriate to a broad class of materials including rocks, rock-like engineered materials (such as concretes and ceramics), and metals. Fundamentally, Kayenta is a computational framework for generalized plasticity models. As such, it includes a yield surface, but the term (3z(Byield(3y (Bis generalized to include any form of inelastic material response (including microcrack growth and pore collapse) that can result in non-recovered strain upon removal of loads on a material element. Kayenta supports optional anisotropic elasticity associated with joint sets, as well as optional deformation-induced anisotropy through kinematic hardening (in which the initially isotropic yield surface is permitted to translate in deviatoric stress space to model Bauschinger effects). The governing equations are otherwise isotropic. Because Kayenta is a unification and generalization of simpler models, it can be run using as few as 2 parameters (for linear elasticity) to as many as 40 material and control parameters in the exceptionally rare case when all features are used. For high-strain-rate applications, Kayenta supports rate dependence through an overstress model. Isotropic damage is modeled through loss of stiffness and strength.},
doi = {10.2172/1238100},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Feb 01 00:00:00 EST 2015},
month = {Sun Feb 01 00:00:00 EST 2015}
}

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