Multiscale Modeling and Experiments for Design of Self-Healing Structural Composite Materials

Abstract

The public reporting burden for this collection of information is estimated to averege 1 hour per response, including the time AFRL-SR-AR-TR-06-0055 and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding thi including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate 1 Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other F comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT SPONSOR/MONITORS REPORTArlington VA 22203 NUMBER(S)12. DISTRIBUTrON/AVAILABILITY STATEMENT Distribution Statement A. Approved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTA set of multi-scale materials systems design tools focused on issues relevant to self-healing structural composites have been developed by a research team from the University of Illinois and the University of Michigan. Our vision was to create a computational framework for materials systems design spanning from atomistic to macroscopic (structural) length scales, supported and validated by a set of experiments conducted at various scales. Although special emphasis in the present project ha, been placed on the modeling of the fatigue response of a self-healing composite, the approach adopted in this project yielded tool that have broad applicability for generic fracture and fatigue problems in modem engineering materials. This paper summarizes our accomplishments of the past three years primarily on the macroscale numerical and experimental aspects of the program. On the numerical side, we have focused on the development, implementation and validation of a cohesive failure model able to capture at the structural level the fatigue retardation effect of the healing agent on the cyclic response of the self-healing composite. SUBJECT TERMS SECURITY CLASSIFICATION OF:17. LIMITATION ABSTRACT A set of multiscale materials systems design tools focused on issues relevant to self-healing structural composites have been developed by a research team from the University of Illinois and the University of Michigan. Our vision was to create a computational framework for materials systems design spanning from atomistic to macroscopic (structural) length scales, supported and validated by a set of experiments conducted at various scales. Although special emphasis in the present project has been placed on the modeling of the fatigue response of a self-healing composite, the approach adopted in this project yielded tools that have broad applicability for generic fracture and fatigue problems in modern engineering materials. This paper summarizes our accomplishments of the past three years primarily on the macroscale numerical and experimental aspects of the program. On the numerical side, we have focused on the development, implementation and validation of a cohesive failure model able to capture at the structural level the...

Percolation modeling of conductance of self-healing composites

“…Indeed, it is hoped [10] that nanoporous fibers with glue will heal smaller damage features, thus delaying the material fatigue at an earlier stage than larger capsules [1,9] which basically re-glue large cracks. Furthermore, on the nanoscale, the glue should be distributed/mixed with the catalyst more efficiently because transport by diffusion alone will be effective [10,11], thereby also eliminating the need for external UV irradiation [9], etc.Theoretical and numerical modeling of self-healing materials are only in the initiation stages [10,12,13]. Many theoretical works and numerical simulations [14][15][16][17] consider formation and propagation of large cracks which, once developed, can hardly be healed by an embedded nano-featured capsules.…”

“…Theoretical and numerical modeling of self-healing materials are only in the initiation stages [10,12,13]. Many theoretical works and numerical simulations [14][15][16][17] consider formation and propagation of large cracks which, once developed, can hardly be healed by an embedded nano-featured capsules.…”

Self-Healing Concrete Techniques and Technologies and Applications

“…The concept of autonomic healing in concrete was proposed initially for cementitious materials by Dry [25] using hollow glass tubes as containers and methyl methacrylate as a healing agent. Recent intense research has been drawn to an autonomous self-healing method using microcapsules for more accurate healing location and better healing capabilities [26]. Discrete microcapsules embedded in the substrate material contain the healing agents.…”

Thermal Mending of Electroactive Carbon/Epoxy Laminates Using a Porous Poly(ε-caprolactone) Electrospun Mesh

“…The ease of manufacturing, design flexibility, lightweight, high strength, low maintenance, elevated durability, lack of corrosion, and multifunctionality are examples of additional assets that can be attributed to this class of materials [ 2 , 3 ]. Despite all these advantages, the monitoring and prediction of composites life span still represents a major problem [ 4 ]. The typical failure mechanism of fiber-reinforced polymers (FRPs) refers to interfacial delamination and/or matrix cracking [ 5 , 6 ].…”