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Static characteristics and fatigue behavior of edge-cracked thickaluminum plates double-side bonded with composite patches(PDF)


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Static characteristics and fatigue behavior of edge-cracked thickaluminum plates double-side bonded with composite patches
He Wang1Du Yonghua1Sun Yungang1Zhang Ming2
1.State-operated Machinery Factory of Wuhu,Wuhu 241007,China; 2.Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology ofFlight Vehicle,Nanjing University of Aeronautics & Astronautics,Nanjing 210016,China
thick aluminum alloy plates composite material tensile strength fatigue life debond
The static and fatigue tests were carried out to verify the effect of the double-sided adhesive joint repairing edge crack aluminum alloy thick plate with composite patches. The relationship between the crack length of aluminum alloy structure and the delamination debonding distribution of the patch during fatigue test was investigated by a non-destructive testing method. The finite element model of the repair structure was established to analyze the influence of the stress distribution of the rubber layer,the crack length and the debonding condition of the patch on the stress intensity factor at the crack tip. The results show that the repair improves the failure strength and fatigue life,which also reduces the stress level and crack growth rate at the crack. The results indicate that the shear stress distribution of the bonding surface matches the fatigue test to determine the debonding expansion,which is parabolic. The bonding performance of the structural adhesive is the key factor affecting the repair effect. The crack growth rate is lower in the case where the cemented surface is not debonded near the crack,and the actual repair can maintain the crack growth rate at a low level by controlling the debonding range,thereby improving the repair effect.


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Last Update: 2019-09-30