항공기용 복합재 외부연료탱크 체결부의 3차원 구조해석
3-Dimensional stress analysis of aircraft composite external fuel tank joint
외부연료탱크 체결부 항공기용복합재 복합재;
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A composite-aluminum hybrid joint of composite external fuel tank of an aircraft has been analyzed by 3-dimensional nonlinear contact finite element method. A finite element analysis program ABAQUS was used for the nonlinear contact analysis. The geometric curvature, contact and adhesive bonding of the joint structure were considered in the analysis. The Tsai-Wu failure criterion and the updated Kim-Soni delamination criterion were utilized for the failure evaluation. A benchmarking model was tested to evaluate the feasibility study of the finite element method. Finite element analysis were conducted for three types of fastener hole - countersunk rivet hole, stem size hole and head size hole. As expected, the results showed that the highest stress concentration factor was obtained in countersunk rivet model. The joint structure was predicted to be safe to carry the maximum design load that was obtained from internal load analysis. The maximum design allowable load without failure of the joint is also presented.
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