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NASA aeronautics defined eight challenge problems for which the AAD Project can deliver specific
research products to address aeronautics community needs. While the research challenges address
different aircraft components and specific aging-related issues, the research results will improve
the ability to detect, predict, and manage aging hazards.
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Damage Methodology for Metallic Airframe Structures
Research Focus: Physics-based damage models for the development of
material design tools.
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Structural Integrity of Integral Metallic Structure
Research Focus: Predictive tools that provide improved lifing/inspection
protocols and enable alternatives to composite structures.
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Durability and Structural Integrity Composite Structures
Research Focus: Reliable strength / life prediction methods accounting for aging degradation, and for reducing empiricism in design and certification and design cycle time.
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Durable Bonded Joints
Research Focus: Novel NDI technology for bond strength, chemistry approaches to improved adhesives / surface treatments, and mechanics predictions for degrading material.
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Aging and Durability of Composite Engine Structures
Research Focus: Reliable test and analysis methods to ensure safety and optimize performance of advanced composite containment systems.
New test and analysis methods are being developed to characterize composite materials used in fan containment systems and to predict
performance of these materials and structures in the aged condition. Thermal/humidity cycling is being performed to represent in-service
aging conditions. Chemical analysis and NDE techniques are used to detect aging effects, while quasi-static and impact tests are used
to evaluate the effects of aging on critical material properties. Aging effects are being added to multi-scale composite material models
for simulation of material deformation and failure in the aged condition. Ballistic impact and structural loading tests on full scale
components are used to simulate blade-out conditions and provide data for model validation. Standardized test/analysis/aging methods
resulting from this research can be applied to ensure safety and optimum performance of current and future advanced containment systems.
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Durability of Engine Superalloy Disks
Research Focus: Durability of new disk alloys at higher operating temperatures and enable improved engine efficiency .
To improve durability of these new superalloy disks, the issues of microstructural instability, hot corrosion and fatigue durability will be addressed via several strategies.
- establish a long-term database and derive analytic models to predict the degradation of new alloys due to microstructural instability and corrosion; and
- develop strategies for coating and surface treatment which minimize corrosion while preserving fatigue life.
Finally, alternate heat treatments will be developed, which enhance fatigue durability at the rim attachment and minimize microstructural instability. Coating and heat treatment strategies will be evaluated with experimental component/spin-test data.
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Durability of Engine Hot Section
Research Focus: New bulk and nano-structured sensor materials and novel thin film harsh environment sensors that provide high temperature characterization for use in component durability improvement.
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Wiring Degradation and Faults
Research Focus: Tools for detection and prediction of intermittent wire and connector faults for next generation aircraft electrical wiring systems.
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