NDLI: Failure analysis of discrete damaged tailored extension-shear-coupled stiffened composite panels

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Failure analysis of discrete damaged tailored extension-shear-coupled stiffened composite panels

Content Provider	NASA Technical Reports Server (NTRS)
Author	Baker, Donald J.
Copyright Year	2005
Description	The results of an analytical and experimental investigation of the failure of composite is tiffener panels with extension-shear coupling are presented. This tailored concept, when used in the cover skins of a tiltrotor aircraft wing has the potential for increasing the aeroelastic stability margins and improving the aircraft productivity. The extension-shear coupling is achieved by using unbalanced 45 plies in the skin. The failure analysis of two tailored panel configurations that have the center stringer and adjacent skin severed is presented. Finite element analysis of the damaged panels was conducted using STAGS (STructural Analysis of General Shells) general purpose finite element program that includes a progressive failure capability for laminated composite structures that is based on point-stress analysis, traditional failure criteria, and ply discounting for material degradation. The progressive failure predicted the path of the failure and maximum load capability. There is less than 12 percent difference between the predicted failure load and experimental failure load. There is a good match of the panel stiffness and strength between the progressive failure analysis and the experimental results. The results indicate that the tailored concept would be feasible to use in the wing skin of a tiltrotor aircraft.
File Size	2399799
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20050180619
Archival Resource Key	ark:/13960/t7bs3rk13
Language	English
Publisher Date	2005-01-01
Access Restriction	Open
Subject Keyword	Composite Materials Degradation Panels Stress Analysis Failure Analysis Stiffness Laminates Composite Structures Aeroelasticity Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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