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Coupling Damage-Sensing Particles to the Digitial Twin ConceptThe research presented herein is a first step toward integrating two emerging structural health management paradigms: digital twin and sensory materials. Digital twin is an emerging life management and certification paradigm whereby models and simulations consist of as-built vehicle state, as-experienced loads and environments, and other vehicle-specific history to enable high-fidelity modeling of individual aerospace vehicles throughout their service lives. The digital twin concept spans many disciplines, and an extensive study on the full domain is out of the scope of this study. Therefore, as it pertains to the digital twin, this research focused on one major concept: modeling specifically the as-manufactured geometry of a component and its microstructure (to the degree possible). The second aspect of this research was to develop the concept of sensory materials such that they can be employed within the digital twin framework. Sensory materials are shape-memory alloys that undergo an audible phase transformation while experiencing sufficient strain. Upon embedding sensory materials with a structural alloy, this audible transformation helps improve the reliability of crack detection especially at the early stages of crack growth. By combining these two early-stage technologies, an automated approach to evidence-based inspection and maintenance of aerospace vehicles is sought.
Document ID
Document Type
Technical Memorandum (TM)
Hochhalter, Jacob (NASA Langley Research Center Hampton, VA, United States)
Leser, William P. (NASA Langley Research Center Hampton, VA, United States)
Newman, John A. (NASA Langley Research Center Hampton, VA, United States)
Gupta, Vipul K. (National Inst. of Aerospace Hampton, VA, United States)
Yamakov, Vesselin (National Inst. of Aerospace Hampton, VA, United States)
Cornell, Stephen R. (Texas A&M Univ. College Station, TX, United States)
Willard, Scott A. (Science and Technology Corp. Hampton, VA, United States)
Heber, Gerd (The HDF Group Champaign, IL, United States)
Date Acquired
May 28, 2014
Publication Date
April 1, 2014
Subject Category
Aeronautics (General)
Report/Patent Number
Distribution Limits
Public Use Permitted.

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