Structural Engineering and Mechanics

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Strain energy release rates in the curved spar wingskin joints with pre-embedded delaminations

  • P.K. Mishra (Department of Mechanical Engineering, Biju Patnaik University of Technology) ;
  • A.K. Pradhan (School of Mechanical Sciences, Indian Institute of Technology) ;
  • M.K. Pandit (School of Mechanical Sciences, Indian Institute of Technology) ;
  • S.K. Panda (Department of Mechanical Engineering, Biju Patnaik University of Technology)
  • Received : 2021.06.01
  • Accepted : 2023.05.22
  • Published : 2023.07.10
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Abstract

Any pre-existed delamination defect present during manufacturing or induce during service loading conditions in the wingskin adherend invariably shows a greater loss of structural integrity of the spar wingskin joint (SWJ). In the present study, inter-laminar delamination propagation at the critical location of the SWJ has been carried out using contact and multi-point constraint finite elements available with commercial FE software (ANSYS APDL). Strain energy release rates (SERR) based on virtual crack closure technique have been computed for evaluation of the opening (Mode-I), sliding (Mode-II) and cross sliding (Mode-III) modes of delamination by sequential release of multi point constraint elements. The variations of different modes of SERR are observed to be significant by considering varied delamination lengths, material properties of adherends and radius of curvature of the SWJ panel. The SERR rates are seen to be much different at the two pre-embedded delamination ends. This shows dissimilar delamination propagation rates. The maximum is seen to occur in the delamination front in the unstiffened region of the wingskin. The curvature geometry and material anisotropy of SWJ adherends significantly influences the SERR values. Increase in the SERR values are observed with decrease in the radius of curvature of wingskin panel, keeping its width unchanged. SWJs made with flat FRP composite adherends have superior resistance to delamination damage propagation than curved composite laminated SWJ panels. SWJ made with Boron/Epoxy (B/E) material shows greater resistance to the delamination propagation.

Keywords

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