 Purpose/Relevance: To develop self-healing materials capable of autonomous protection and recovery from blast induced damage.  Innovation: - Extension of self-healing technology with seamless integration into state-of-the-art composite structural systems. - New self-healing materials development for blast damage.  This Year’s outcome: - Demonstration of self-healing in microvascular PUR foam for sandwich panel core materials - Development of vascularized 3D woven fiber-reinforced composite  Long-range impact: New class of self-healing materials developed with specific emphasis on high-energy absorption capabilities for blast infrastructure.  Next Year: System optimization through experimental evaluation. Structural sandwich panel integration. Publish research findings in peer-reviewed journals. Self-Healing Materials for Mitigation of Blast Damage Pis: N.R. Sottos, S.R. White Student: J. Patrick

Progress to Date: Polyurethane (PUR) foam core material Self-Healing Foam Core for Structural Sandwich Panels Recovery of Mode I Fracture Toughness Microvascular Healing 3D Woven Composite Sandwich Structure (3TEX)

Progress to Date: Self-Healing 3D Woven Composite Face Sheets “Sacrificial” fibers woven into 3D preform Composite fabricated via VARTM Fiber evacuation by heating Delivery of healing fluids 3D Woven Composite Sandwich Structure (3TEX) 3D Woven Preform

Research Plan Optimize PUR foam healing system through experimental evaluationOptimize PUR foam healing system through experimental evaluation Develop a protocol to damage and heal the woven composite face sheets, e.g. End Notched Flexure (ENF) or Compression after Impact (CAI)Develop a protocol to damage and heal the woven composite face sheets, e.g. End Notched Flexure (ENF) or Compression after Impact (CAI) Demonstrate recovery of mechanical properties in woven fiber- reinforced composites and measure healing efficiencyDemonstrate recovery of mechanical properties in woven fiber- reinforced composites and measure healing efficiency Begin integration of self-healing of core and face sheet components into structural composite sandwich panel for eventual blast evaluationBegin integration of self-healing of core and face sheet components into structural composite sandwich panel for eventual blast evaluation

 Current Ph.D. student: Jason Patrick  Papers/Patents/Presentations:  “Three-Dimensional Microvascular Fiber-Reinforced Composites”, submitted for publication (2011).  “A Method for Preparation of Three-Dimensional Microvascular Fiber-Reinforced Composites” University of Illinois Invention Disclosure (2011)  Collaboration with Industry: Collaborated with 3-Tex on manufacture of 3-D woven composite face sheets with sacrificial fibers to create microvascular networks for healing.  Picture: Self-Healing Materials for Mitigation of Blast Damage Prof. Nancy Sottos, University of Illinois Urbana-Champaign Sacrificial fibers woven into 3D glass preform (3TEX) Microvascular composite capable of fluid transport