AN INVESTIGATION OF THE STRESSES AND DISPLACEMENTS IN THREE MONOLITHIC SEMIMONOCOQUE SKIN PANELS.
Final rept. Jul 64-Sep 67,
OKLAHOMA STATE UNIV STILLWATER SCHOOL OF MECHANICAL ENGINEERING
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Refinement to the direct stiffness method and the redundant force method of structural analysis are used to predict the stress and deflection behavior of three geometric configurations of integrally reinforced skin panels. The design of the panels simulates the idealizations that are commonly used in airplane structural analysis. Parallel experimental investigations, using a concentration of strain gages, provides a basis for the evaluation of the analytical results. Both of the methods of analysis were modified to include new stiffness and flexibility matrices. Matrix algebra digital computer programs are developed for each method of analysis. Experimental techniques, including data reduction programs based on the least-squares criterion, are presented for the investigation of various types of skin panel structures. It was shown that stresses and displacements for integrally reinforced skin panels can be accurately determined by either the direct stiffness method or the redundant force method. Author