Law of deviation angle and prediction of residual life for reinforced structure with holes
One of the means to ensure structural lightweight and reduce operation cost in the aerospace and other fields is to design and manufacture aviation wall panels.However,they fail to suppress crack propagation,thus resulting in a sharp decrease in service life and difficulties in meeting the requirement of damage tolerance.Therefore,the selective reinforcement is a key technology to solve this problem.In this article,in order to improve the deflection angle of reinforced structural cracks,efforts are made to artificially promote crack turning.By adding holes near the reinforced panel and considering the influence of the geomet-ric parameters of multiple reinforced panels,the analysis is conducted on different reinforced structural cracks'deflection angle and service life.The finite-element analytical software ABAQUS and FRANC3D are used for crack propagation;efforts are made to explore the influence of the size parameters of the holes and the multiple reinforced panels on both the stress concentration and the path of crack propagation.It is shown that the models with holes and multiple reinforced panels significantly expand the cracks'deflection angle,and the optimized size parameters of the reinforced panels are determined with the help of the orthogonal experimental method.That is to say,when the relative axial distance of the reinforced panel 2 is 16％,the relative horizontal dis-tance is 16.67％,and the deflection angle is 20°,the deflection angle tends to expand.
reinforced structurereinforced panelholecrack turningresidual life
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