Master process sheets for fabrication of CFC centre fuselage parts for TEJAS (Light Combat Aircraft) - part-4

Govindan, Kutty M and Saravana, Kumar N and Ramesh, Sundaram and Sudheendra, HN and Subbarao, M (2009) Master process sheets for fabrication of CFC centre fuselage parts for TEJAS (Light Combat Aircraft) - part-4. Technical Report. NAL.

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Abstract

Advanced Composites Division has developed innovative techniques to realise complex and doubly curved stiffened panels. Different approaches have been adopted to ensure the proper consolidation of laminate and stiffener spacing. The sub tools that are needed for fabricating the components are obtained using derivative tooling concepts that can avoid elaborate and sophisticated machining operations. The bladed stiffeners are co-cured and co-bonded along with the skin in order to achieve the outstanding benefits of composites such as reduced cost, reduced integration time, . reduction in stress concentration due to drilled holes. The experience in tooling over a period of time compelled us to adopt separate tooling concept for layup and curing. Layup tools are stiff enough in order to maintain the dimensional accuracy and the curing tools are thin to provide a uniform distribution of pressure over the component. As the stiffeners are curved, special brackets were designed and fabricated that avoids the waviness of the stiffener. The fixture that has been integrated with the mould confirmed the straightness of the stiffener. This report explains the manufacturing process in systematic manner so that the composite product can be realised by skilled manpower with minimal training. . This process has been fine tuned keeping the view of series production of LCA.

Item Type: Proj.Doc/Technical Report (Technical Report)
Uncontrolled Keywords: Light Combat Aircraft,Co-curing,Derivative tools,Centre fuselage,Autoclave moulding,Doubly curved,stiffened panels,Transfer foils,Layup tools,curing tools
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Division/Department: Advanced Composites Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division
Depositing User: Mr. Guest NAL
Date Deposited: 27 Jul 2010 11:58
Last Modified: 27 Jul 2010 11:58
URI: http://nal-ir.nal.res.in/id/eprint/8779

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