Mechanics of Nanowire Interfaces Across Strain Rates
Abstract
The objective of this research effort is to study nanostructured interfaces in carbon fiber reinforced composites such that lightweight materials can be designed for both structural and ballistic performance. This objective will be met through the analysis of the interfacial toughening mechanism of ZnO nanowires grown on the surface of carbon fibers under varying strain rates so as to develop a fundamental understanding of failure in the presence of a nanostructured functional gradient. The process for using nanowires to reinforce the interface was recently developed by the PI and allows for growth at low temperature, which preserves the fiber strength. The nanowire growth process is highly controllable and acts to enhance the load transfer between the matrix and fiber and provide out of plane reinforcement. The controllable nanowire growth provides a means for optimizing the interfacial properties such that an ideal material response can be obtained at both high and low strain rates. Dr. SodanoÕs recent studies have shown that variation of the interphase morphology (dimensions of the nanowires) can lead to a drastic change in the interfacial strength of the fiber and in the friction between the tows. However the behavior of the interface and the mechanism by which it acts to strengthen the composite is not known. The following questions will be addressed through this research effort: Why and how does morphology impact the interfacial strength of the fiber across strain rates? Is a functional gradient responsible for improved interfacial strength? Can the interface be tailored to vary the behavior as a function of loading rate? Can the Interface continue to carry load after dynamic failure of the interface?
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 11, 2018
- Source ID
- W911NF1610229
Entities
People
- Henry A Sodano
Organizations
- Army Contracting Command
- United States Army
- University of Michigan