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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1992, Vol. 13 ›› Issue (2): 20-25.

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SOLUTION OF STRESS INTENSITY FACTORS AT CRACKS IN SHEETS AND STRINGERS OF STIFFENED PANELS

Huang Wei yang   

  1. Nanjing Aeronautical Institute, Nanjing, 210016
  • Received:1990-03-15 Revised:1990-07-20 Online:1992-02-25 Published:1992-02-25

Abstract:

An analytical method is proposed to determine the stress intensity factor of" a stiffened panel with cracks in sheet and in stringer on the basis of complex stress functions and zonal generalized variational principles. The crack boundary conditions are satisfied exactly by complex stress functions and the other boundary conditions are satisfied approximatively by zonal generalized variational principles. As an example we consider a stiffened panel with a central crack in the sheet and an edge crack in the stringer. The load is uniform tensile stress applied normally to the crack plane. The expressions of stress intensity factors are giren.

Key words: Complex stress function, Zonal generalized variational principle, Stress intensi- ty factor, Stiffened panel