2.2.1.2 Self-Healing Materials for Tip Region Cracks Science & Technology Objective(s): •Identify one or more self-healing materials that have potential for gas turbine component construction •Demonstrate the ability of an emerging self-healing material for fan and/or compressor airfoils Photograph of spin Pit & Rub Shoe 2.2.1 Advanced Materials Dunn & Mills (Ohio State) & Adams (Case Western) Collaborations: •Government - NASA Glenn and U.S.Air Force •URETI - Ohio State, Case Western •Industry - GEAE, Rolls-Royce America, and P/W •Synergism with existing programs - GEAE blade tip rub program at OSU Proposed Approach: •Identify potential “smart materials” for airfoil and casing •Extend “smart material” temperature range •Incorporate entrained pockets of metal with good wetting properties NASA Relevance/Impact: •Significant reduction in potential tip losses because of damaged airfoils •Cost savings because airfoil replacement advantages •Crack reduction should reduce blade-out potential Milestones/Accomplishments: •Selection of potential materials •Incorporation of entrained pockets of metal in material •Demonstration of high temperature and strength capability of material selected •Develop model for tip/casing rub dynamics •Verify model with realistic measurements •Tip rub measurement program @ engine speed