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Softening Models for Concrete: Stability and Uniqueness

by Donald R. Curran, SRI Intl, Menlo Park, United States,
James K. Gran, SRI Intl, Menlo Park, United States,
Lynn Seaman, SRI Intl, Menlo Park, United States,
Tarabay H. Antoun, SRI Intl, Menlo Park, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract:

A microstructurally-based, numerically oriented, fracture-induced softening model for concrete is presented. Rate-dependent evolution equations for microcrack nucleation, growth, and coalescence are introduced in a manner that insures uniqueness and stability of the solution even during localized deformation [Curran (1988), Curran and Seaman (1991)]. Cell size independence is maintained by the introduction of a microstructurally-based control volume. Softening occurs naturally as the partition of total strain evolves toward more damage strain and less elastic (stress-producing) strain in the intact material.

Subject Headings: Strain | Strain hardening and softening | Cracking | Concrete | Strength of materials | Mathematical models | Computer models

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