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This paper presents the two-dimensional fracture mechanics solutions of a through-the-thickness edge crack in a stiffened sheet. The sheet is assumed to be under the plane-stress condition, and the stiffeners are taken as one-dimensional rods discretely attached to the sheet. The fastener forces are determined by enforcing the displacement compatibility at fastener locations and by the equilibrium condition for broken stiffeners. The problem is then reduced to the solution of a set of two simultaneous integral equations. The solution procedure employed allows direct evaluation of the unknowns, leading to efficient determination of the fastener forces as well as the stress intensity factors. Numerical examples are presented.
fracture mechanics, edge crack, stress intensity factor, stiffened sheet, integral equation
Principal engineer, Douglas Aircraft Company, McDonnell Douglas Corporation, Long Beach, CA