Paper number 993

DAMAGE DETECTION OF CFRP LAMINATED BY USING LOCALIZED FLEXIBILITY METHOD

O-IL Byon¹, Yoshio Aoki², Tatsuya Yamaguchi³, K. C. Park⁴ and Greg W. Reigh⁴

1Department of Mechanical Engineering, College of Industrial Technology, Nihon University,
1-2-1 Izumi-cho, Narashino, Chiba, 275-8575 Japan
2Department Precision Machinery Engineering, College of Sciences and Technology,
Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba, 274-8501 Japan
3Graduate School of Nihon University, College of Industrial Technology
4Center for Aerospace Structures and Department of Aerospace Engineering Sciences,
University of Colorado, Campus Box 429, Boulder, CO 80309

Summary

This paper presents modal-based structural damage detection. Specifically, we focus on localized flexibility properties that can be deduced from the experimentally determined global flexibility matrix. We describe the underlying damage detection theory that can be viewed a generalized flexibility formulation in three different generalized coordinates, viz., localized or substructural displacement, elemental deformation-basis and element strain-basis. The three localized flexibilities are applied to a CFRP beam having interior damage. The results show that the elemental strain-basis flexibility is most accurate in detecting the damage of the CFRP laminates.

Keywords

CFRP, damage detection, localized flexibility, substructural flexibility, deformation-based flexibility, strain-based flexibility, inverse problem, FEM.