Applying the Work Potential Theory to the Material Characterization of Concrete
Abstract
Concrete is an extraordinarily flexible building material that can be used to build common sidewalks as well as blast-resistant bunkers. Its range of application is made possible by its range of admixtures. However, this wide range also makes it an extraordinarily complex system to analyze, especially under high stress, high strain rate conditions. Under these conditions, the concrete structure is often damage when microcracks form in the cement matrix or when the aggregate itself cracks. Sometimes, the cement-aggregate bond can separate. Microcracks can coalesce into macrocracks. Creep, over time, can induce additional levels of damage. Understanding how these modes of damage effect the overall remaining strength of a concrete structure is of paramount concern when that structure must be relied upon to absorb future damage. However, no current technique for analyzing concrete exists that allows the analyst to account for past damages when estimating future responses. The proposed solution is to adapt the Work Potential Theory (WPT) to concrete. The WPT maintains that work supplied to the structure must be balanced by internal work due to strain. Some of that work is recoverable, while some of it is not. The unrecoverable work represents the sum total energy lost in the system via damage. The WPT maintains a memory of these damages and can continue analyzing the structure for future events, such as a second or third missile impact. The WPT will make it possible for the first time to analyze concrete ranging in ingredients, strength, age, and multiple impact events.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 28, 2018
- Source ID
- FA95501810429
Entities
People
- Kevin Schrum
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Alabama at Birmingham