TY - JOUR
T1 - Identification of disbond and high density core region in a honeycomb composite sandwich structure using ultrasonic guided waves
AU - Sikdar, Shirsendu
AU - Banerjee, Sauvik
N1 - Funding Information:
This research was supported by the Indian Space Research Organization (ISRO), India. Under the Grant No. 11ISROC001.
PY - 2016/9/15
Y1 - 2016/9/15
N2 - The aim of this study is to identify disbond and high-density (HD) core region in a honeycomb composite sandwich structure (HCSS) using ultrasonic guided waves (GWs) and surface-bonded piezoelectric wafer transducers (PWTs). Towards this, an organized theoretical, numerical and experimental study has been carried out in order to understand the characteristics of GW propagation in a HCSS. A global matrix method based efficient and fast two dimensional (2D) semi-analytical model is used to study transient response and dispersion characteristics of the healthy HCSS under PWT excitations. Numerical simulation of GW propagation in HCSS with disbond and HD-core is then carried out using finite element package, ABAQUS. Laboratory experiments are then carried out to validate the theoretical and numerical results. A good agreement is observed between the theoretical, numerical and experimental results in all cases studied. It is found that the presence of HD-core region leads to decrease in amplitude of the propagating GW modes and the presence of disbond leads to substantial amplification of the primary anti-symmetric mode. Finally, based on these changes in modal behaviors, the location and size of unknown disbond and HD-core region within the PWT array are experimentally determined using a probability based damage detection algorithm.
AB - The aim of this study is to identify disbond and high-density (HD) core region in a honeycomb composite sandwich structure (HCSS) using ultrasonic guided waves (GWs) and surface-bonded piezoelectric wafer transducers (PWTs). Towards this, an organized theoretical, numerical and experimental study has been carried out in order to understand the characteristics of GW propagation in a HCSS. A global matrix method based efficient and fast two dimensional (2D) semi-analytical model is used to study transient response and dispersion characteristics of the healthy HCSS under PWT excitations. Numerical simulation of GW propagation in HCSS with disbond and HD-core is then carried out using finite element package, ABAQUS. Laboratory experiments are then carried out to validate the theoretical and numerical results. A good agreement is observed between the theoretical, numerical and experimental results in all cases studied. It is found that the presence of HD-core region leads to decrease in amplitude of the propagating GW modes and the presence of disbond leads to substantial amplification of the primary anti-symmetric mode. Finally, based on these changes in modal behaviors, the location and size of unknown disbond and HD-core region within the PWT array are experimentally determined using a probability based damage detection algorithm.
KW - Disbond
KW - Group velocity
KW - Guided wave
KW - High-density core
KW - Honeycomb composite sandwich structure
KW - Piezoelectric wafer transducers
UR - http://www.scopus.com/inward/record.url?scp=84971455423&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2016.05.064
DO - 10.1016/j.compstruct.2016.05.064
M3 - Article
AN - SCOPUS:84971455423
VL - 152
SP - 568
EP - 578
JO - Composite Structures
JF - Composite Structures
SN - 0263-8223
ER -