Composite repairs to rib stiffened panels

Comparison of double and single bonded repairs to symmetric composite structures: a numerical analysis

“…An optimization of the patch thickness is recommended. Ting et al [1] and Turaga and Ripudaman [9] obtained this conclusion. It is noted that the difference of the stress intensity factor between a single and double symmetric patch is stabilized when the thickness e r is greaten then 2 mm.…”

“…The stress intensity factor is then reduced by the presence of the patch. Several authors showed that the mode I stress intensity factor of repaired crack, exhibits an asymptotic behaviour as the crack length increases [1][2][3][4][5]. The asymptotic value of the SIF was approximated by Rose [6] by the formulas:…”

“…Many authors shown the advantage of the double-sided symmetric patches experimentally and numerically, among them we can quote. Ting et al [1], Turaga and Ripudaman [9], Chen and Yang [10], Megueni et al [11]. All these authors observe that the double-sided symmetric patch reduces more the stress intensity at the crack tip.…”

Fracture analysis of Kevlar-49/epoxy and e-glass/epoxy doublers for reinforcement of cracked aluminum plates

“…It is then challenging to derive stress intensity factors and predict the fatigue behavior of the repaired structure. Since the first use of a composite patch to repair damaged aircraft and marine structures [1], progresses have been made to improve the accuracy of prediction methods and the effectiveness of bonded composite patch repair technique [2][3][4][5]. Various numerical methods such as boundary element method, collocation method, finite difference method, finite element method and finite element alternating method have been developed for a better prediction of fracture.…”

Analysis of cracked aluminum plates with one-sided patch repair using p-convergent layered model

“…Especially, it was pointed out that SIF at the crack tip as fracture parameter is important for the prediction of the extent of improved performance of a bonded composite repair. The analytical investigations were primarily based on the finite element method, namely Ayatolahi and Hashemi [6], Mitchel et al [7], Jones and Callinan [8], Ting et al [9], Bouiadjra et al [10], Umamaheswar and Singh [11].…”