Design Methodology and Life Analysis of Postbuckled Metal and Composite Panels. Volume 1
Final rept. Sep 1981-Aug 1985
NORTHROP CORP HAWTHORNE CA AIRCRAFT DIV
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The objectives of this program were to develop an experimentally validated analysis capability and simple to use design procedures for curved metal and composite postbuckled panels loaded in compression or shear. The program plan was to first review the available analysis methods for postbuckled panels and then extend or modify these to develop a design methodology for curved postbuckled panels. This methodology was used in designing curved panels for a test program to generate design validation and fatigue life data. The program was performed in four tasks. Task I consisted of selecting analysis methods and design procedures for postbuckled metal and composite panels. The design methodology selected was semiempirical in nature and based on classical methods for metal panels with some modifications made for application to composite materials. The analysis procedure were coded in computer programs that can be used as efficient design tools. A series of tests on curved metal and composite panels were conducted in Task II to assess the accuracy of the design procedures. The results from Task II showed that the semiempirical strength predictions were conservative for composite panels by approximately 30 percent. In Task III nonempirical analysis methods based on the principle of minimum potential energy were developed to predict the displacement and strain fields in curved metal and composite panels. These predictions were compared against the test data generated in Task II. The predictions showed the same trends as the measured data.
- Laminates and Composite Materials