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Residual Strength Analysis Methodology: Laboratory Coupons to Structural ComponentsThe NASA Aircraft Structural Integrity (NASIP) and Airframe Airworthiness Assurance/Aging Aircraft (AAA/AA) Programs have developed a residual strength prediction methodology for aircraft fuselage structures. This methodology has been experimentally verified for structures ranging from laboratory coupons up to full-scale structural components. The methodology uses the critical crack tip opening angle (CTOA) fracture criterion to characterize the fracture behavior and a material and a geometric nonlinear finite element shell analysis code to perform the structural analyses. The present paper presents the results of a study to evaluate the fracture behavior of 2024-T3 aluminum alloys with thickness of 0.04 inches to 0.09 inches. The critical CTOA and the corresponding plane strain core height necessary to simulate through-the-thickness effects at the crack tip in an otherwise plane stress analysis, were determined from small laboratory specimens. Using these parameters, the CTOA fracture criterion was used to predict the behavior of middle crack tension specimens that were up to 40 inches wide, flat panels with riveted stiffeners and multiple-site damage cracks, 18-inch diameter pressurized cylinders, and full scale curved stiffened panels subjected to internal pressure and mechanical loads.
Document ID
20040086966
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Dawicke, D. S. (NASA Langley Research Center Hampton, VA, United States)
Newman, J. C., Jr. (NASA Langley Research Center Hampton, VA, United States)
Starnes, J. H., Jr. (NASA Langley Research Center Hampton, VA, United States)
Rose, C. A. (NASA Langley Research Center Hampton, VA, United States)
Young, R. D. (NASA Langley Research Center Hampton, VA, United States)
Seshadri, B. R. (National Academy of Sciences - National Research Council Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Structural Mechanics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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