Table of Contents
Modeling of Toughness Degradation and Embrittlement in Cement Based Composite Materials Due to Interfacial Aging
Scope of Presentation
Fracture Mechanics Formulation for Toughening
Areas of Application of FRC materials
GFRC Panel Details
Other GFRC projects in California
Composite Stress-Strain
Toughening Due to Fiber Bridging
Mechanisms of Aging
Experimental Aging Data-Tension Test results
Fiber Pullout
Pullout formulation
Displacement & Energy Release Rate Solutions
Comparison with Experimental Results
Effect of clamping pressure and interfacial yield strength
Simulation of Fiber Pullout for aged and Unaged Glass Fibers
Fiber Types
Glass Fiber Debonding and Pullout
Flexural Test Setup
Coupled problem of matrix and interface crack growth
R-Curve parameters
Composite Failure Criteria- Stress Intensity Reduction & Crack Closure Terms
Solution Methodology to Compute R-Curve Parameters
Force-Displacement Response using the R-Curve
Methodology to Compute R-Curve Parameters Coupling of matrix and interface crack growth
Effect of interfacial shear strength
Effect of fiber volume fraction
Toughening of the Matrix in terms of KI required for crack growth
Model Predictions for Effect of Fiber Length in FRC Composites
Modeling of SFRC
Effect of Aging on the R-Curve
Effect of Aging on the Load Deformation Response
Conclusions