CALCULATION OF STRESS INTENSITY FACTOR FOR A BONDED REPAIR STIFFENED PANEL AND SHEAR STRESS IN THE ADHESIVE BOND BETWEEN PATCH AND PLATE

Based on the method of the rivet force, an analytic methodfor calculating the stress intensity factor (SIF) for a bonded repairstringer plate and the shear stresses in the adhesive bond between patchand plate is presented. The method can be used to determine thestrength of a bonded repair stringer plate.The expressions ofdisplacements of stringer, patch and plate are obtained by usinginfluence coefficients. According to the condition of displacement compatibility, a truncated set of simultaneous equations is obtained. Thusthe shearstresses in the adhesive bond between patch and plate and the forces ofrivet can be obtained. The SIF at the crack tip can be calculated by ananalytic expression. The influence of stringer and patch on SIF isfully considered, and then the repair effect is analyzed.