205. non-destructive evaluation method for detecting major damage in internal composites structural components

Department: Structural Engineering
Faculty Advisor(s): Francesco Lanza Di Scalea | Hyonny Kim | Francesco Lanza Di Scalea

Primary Student
Name: Margherita Capriotti
Email: mcapriot@ucsd.edu
Phone: 858-260-9662
Grad Year: 2019

Student Collaborators
Eric Kim, hsk027@eng.ucsd.edu

Abstract
Wide Area Impact Damage (WAID) can occur in aircraft structures due to ground service vehicles or other maintenance actions. Often this damage is not visible and can affect the structural safety of the structure. The aircraft industry is in need for a rapid Non-Destructive Evaluation (NDE) tool that can detect the presence of such damage with access from the aircraft exterior surface. In this study, a contact and non contact method based on ultrasonic guided waves and statistical analysis are discussed to address this need. Two scanning systems have been developed and tested on large-scale stiffened composite panels that are representative of commercial aircraft construction. The panels were previously tested to slow impacts to generate the desired type of WAID. The results show that the differential detection approach, aided by an outlier statistical analysis, is able to detect damage in the panels? skin and stringers. Ongoing work is aimed at penetrating the shear-ties and C-frames for detection of damage in these components. The detection performance of the systems is quantified based on Receiver Operating Characteristics curves (ROC curves) to assess the Probability of Detection versus the Probability of False Alarms, for each of the defect types considered.

Industry Application Area(s)
Aerospace, Defense, Security | Civil/Structural Engineering | NDE/SHM

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