Structural health monitoring and damage prognosis in composite repaired structures through the excitation of guided ultrasonic waves

S. Pavlopoulou; K. Worden; C. Soutis

doi:10.1117/12.2009346

17 April 2013 Structural health monitoring and damage prognosis in composite repaired structures through the excitation of guided ultrasonic waves

S. Pavlopoulou, K. Worden, C. Soutis

Author Affiliations +

Proceedings Volume 8695, Health Monitoring of Structural and Biological Systems 2013; 869504 (2013) https://doi.org/10.1117/12.2009346
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

Abstract

The interest in composite repair technologies has been recently increased following the wide applications of com- posite materials in aerospace industry. Bonded repair patch technology provides an alternative to mechanically fastened repairs with signi cantly higher performance. The work here demonstrates two case studies: a woven composite panel repaired with an external composite patch and a woven composite panel with a scarf repair that minimises discontinuities and provides smoother surface. In the rst case, piezoelectric transducers were utilized in order to excite low frequency Lamb waves while the panel was tested under static tensile loading. In the sec- ond case, piezoelectric (PZT) transducers were surface bonded and the propagation of the rst anti-symmetric Lamb waves mode was investigated while the panel was subjected to fatigue loading. Along with Lamb wave testing, additional techniques were used to monitor the extent of the developed damage such as 3-dimensional Digital Image Correlation, X-ray radiography and optical microscopic analysis. All signals in both cases were further processed with outlier analysis and linear and non linear principal component analysis in order to develop an appropriate damage prognosis strategy. The current work identi es the problems of the traditionally used novelty detection approaches and proposes solutions through the concept of principal curves and appropriate feature extraction techniques.

Citation Download Citation

S. Pavlopoulou, K. Worden, and C. Soutis "Structural health monitoring and damage prognosis in composite repaired structures through the excitation of guided ultrasonic waves", Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 869504 (17 April 2013); https://doi.org/10.1117/12.2009346

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available