Piezo health monitoring of adhesive joints

• Applicant: Professor Dr.-Ing. Wilfried Becker
• Subject Area: Applied Mechanics, Statics and Dynamics ; Mechanics
• Term: Funded in 2014
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 259409916

• Final Report Year: 2014

Final Report Abstract

The idea pursued here is to set up an analytical model and to find the interface debonding for a overlap zone of a smart hygrothermalelectric single lap joint under static and dynamic time harmonic load and the influence from the environment. In both cases of combined loading the debond length in the overlap zone is studied in detail. Then, it becomes possible to determine the value of the combined load at which the elastic-brittle interface delamination begins to grow up as a function of the mechanical and electric external loads. Respective numerical examples are given for problems of hygrothermapiezoelectric, piezoelectric, thermalpiezoelectric behaviours of the considered structure under static and dynamic time harmonic load, illustrated by figures and discussed. Special attention is paid to the influence of the environment conditions on the behavior of the debond length in the overlap zone. A possible criterion for detection of the debond length through the value of the electric gradient is proposed. Such a criterion could help easily to measure the delamination in practice.

Publications

• Interfacial debonding of a piezoelastic bi-material structure applicable for wind rotor blades, Mechanics of Advanced Materials and Structures (2014)
  J. Ivanova, V. Valeva, T. Petrova, W. Becker
  
• Monitoring of piezo single lap joints under static loading, SDEWES2014-0202, In: Proc. 9th Conf. on Sustainable Development of Energy, Water and Environment Systems – SDEWES, 20-27 September 2014, Venice-Venice, 2014, CD
  W. Becker, V. Valeva, T. Petrova, Ivanova, J.
  
• Piezo health monitoring of adhesive joints, SDEWES2014-0194 In: Proc. 9th Conf. on Sustainable Development of Energy, Water and Environment Systems – SDEWES, 20-27 September 2014, Venice-Venice, 2014, CD
  Ivanova, J., V. Valeva, T. Petrova, W. Becker
  
• Technical damage in wind rotor blade under static load at environment conditions, Chemical Engineering Transactions, vol. 42, 2014, ISBN: 978-88-95608-33-4; ISSN: 2283-9216, 2014, S. 91-96
  Wilfried Becker, Varbinka Valeva, Tatyana Petrova, Jordanka Ivanova