Macro- and Micro-Mechanics of Mixed-Mode Dynamic Fracture of Concrete. Part 1. Micro-Mechanic Analysis
Abstract
A hybrid experimental-numerical procedure was used to analyze the micro-mechanics of the mixed-mode, static and dynamic fracture of a concrete three-point bend specimen with an offset precrack. Four/two beam moire interferometry was used to record simultaneously separating horizontal and vertical displacements associated with stable/rapid growth. An elasto-static/ elasto-dynamic finite element code was execute in its propagation mode with assumed crack closure stress (CCS) versus crack opening displacement (COD) and crack shearing stress (CSS) versus crack sliding displacement (CSD) relations which were adjusted to match the computed and measured COD's and CSD's. The resultant CCS versus COD and the CSS versus CSD relations were then used to compute the dissipated energy in the FPZ. This energy dissipation rate in the FPZ accounted for about 80% of the total energy release rate throughout the dynamic fracture process. This study also showed that the strain energy released at the crack tip and the dissipated energy in the fracture process zone after crack kinking are due mainly to mode I crack tip) deformation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 14, 1993
- Accession Number
- ADA265676
Entities
People
- Albert S. Kobayashi
- Chang-te Yu
- Neil M. Hawkins
- Zhikai Guo
Organizations
- University of Washington