The Role of Interfaces in the Fracture of Functionally Graded Materials
Abstract
The research focuses on establishing conditions when interfaces between interlayers are important in governing fracture processes in composites with graded compositions. A theoretical framework is sought that could ultimately quantify the role of interfaces when their presence dominates behavior. Initial work is driven towards establishing general trends. Experimentally, multilayer composites have been fabricated by several techniques that aim at modifying interface characteristics. The competition between fracture at notches of particular depth parallel to the interface and interface fracture is examined. A numerical model is being constructed to obtain crack tip and interface/free edge stress fields to better understand experimental trends. Also, models are being devised to examine how the presence of the interface modifies the stress field of an edge crack parallel to the interface. Experiments in which cracks are extended from notches placed near interfaces have been conducted utilizing optical moir interferometry (conducted at INEEL). The crack driving force and mode mixity as a function of type of interface and proximity to interface are being determined.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 22, 2005
- Accession Number
- ADA430458
Entities
People
- Ivar Reimanis
- John Berger
Organizations
- Colorado School of Mines