Accession Number:

ADA172512

Title:

An Endochronic Plasticity Theory for Concrete.

Descriptive Note:

Technical rept. 21 Nov 83-31 Dec 84,

Corporate Author:

S-CUBED LA JOLLA CA

Personal Author(s):

Report Date:

1985-02-20

Pagination or Media Count:

113.0

Abstract:

A fully three-dimensional endochronic plasticity theory for plain concrete is developed to describe its multi-axial behavior over the stress range below that at which significant cracking occurs. The theory is isotropic and exhibits the important features of concrete behavior, including shear-volumetric coupling, effect of hydrostatic pressure on shear response, hardening, hysteretic effects and stress path dependence. The theory is based on the hypothesis that the current state of stress is a linear functional of the entire history of deformation, with the history defined with respect to a time scale, called intrinsic time, which is itself a property of the material at hand. The theory is proof-tested with remarkable success against an extensive set of complex multi-axial plain concrete data recently obtained by others with a true triaxial device. An analytical procedure for reducing the linear hereditary integral expressions for the stresses to a system of coupled linear ordinary differential equations is described, and a numerical approach is given for treating the resulting governing system of equations under either stress- or strain-controlled conditions. Keywords Plasticity, Mathematical models, Stress and strain, Stress response, Shear properties.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE