Accession Number:

ADA199204

Title:

A Parameter Estimation Algorithm and Extensive Numerical Simulations for the Cap Model

Descriptive Note:

Technical rept. 1 Oct 1984-31 Oct 1985

Corporate Author:

CALIFORNIA UNIV BERKELEY DIV OF STRUCTURAL ENGINEERING AND STRUCTURAL MECHANICS

Personal Author(s):

• Ju, Jiann-Wen
• Simo, Juan C.
• Pister, Karl S.
• Taylor, Robert L.

Report Date:

1985-11-30

Pagination or Media Count:

57.0

Abstract:

The inviscid two-invariant cap model is considered for geological materials such as concrete. A systematic constrained optimization procedure based on the Marquardt-Levenberg algorithm and the Armijo step-size rule is developed to determine values of the model parameters from available experimental data. The predictive capabilities of the cap model and the efficiency of the parameter estimation procedure are assessed through extensive numerical simulations based on well-documented experimental concrete data from the University of California. Keywords Rock mechanics, Concrete, Computer programs, Parameter estimation, Numerical simulations, Cap model, Colorado concrete data, Plasticity. jhd

Descriptors:

• *CONCRETE
• *ROCK MECHANICS
• EXPERIMENTAL DATA
• OPTIMIZATION
• MODELS
• PARAMETERS
• DIGITAL SIMULATION
• NUMERICAL ANALYSIS
• GEOLOGY
• ESTIMATES
• PLASTIC PROPERTIES
• ALGORITHMS
• COMPUTER PROGRAMS
• MATERIALS

Subject Categories:

• Geology, Geochemistry and Mineralogy
• Ceramics, Refractories and Glass
• Computer Programming and Software
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE