A hybrid method based upon nonlinear Lamb wave response for locating a delamination in composite laminates.
A new hybrid method based upon nonlinear Lamb wave response in time and frequency domains is introduced to locate a delamination in composite laminates. In Lamb wave based nonlinear method, the presence of damage is shown by the appearance of higher harmonics in the Lamb wave response. The proposed method not only uses this spectral information but also the corresponding temporal response data, for locating the delamination. Thus, the method is termed as a hybrid method. The paper includes formulation of the method and its application to locate a Barely Visible Impact Damage (BVID) induced delamination in a Carbon Fiber Reinforced Polymer (CFRP) laminate. The method gives the damage location fairly well. It is a baseline free method, as it does not need data from the pristine specimen.
Department of Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India. Electronic address: nitesh@aero.iitb.ac.in.
Nitesh P
NP
Yelve
Department of Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India.
Mira
M
Mitra
Department of Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India.
P M
PM
Mujumdar
Composite Research Center, Research and Development Establishment (Engineers), Defence Research and Development Organization, Pune 411015, India.
C
C
Ramadas
BVID; Delamination; Hybrid method; Locating damage; Nonlinear Lamb waves; Temporal and spectral response