Challenges in Static Testing of Co-Cured Co-Bonded Composite Aircraft Structures

Ramanaiah, B and Ramachandra, HV and Sanjeev Kumar, S and Kotresh, Gaddikeri M and Byji, Varughese and Ramesh, Sundaram and Kamath, GM and Subba Rao, M (2009) Challenges in Static Testing of Co-Cured Co-Bonded Composite Aircraft Structures. In: Natonal Conference on Scientific Achievements of SC & ST Scientisits and Technologists, 14-16 April 2009, Bangalore.

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    Abstract

    Due to several advantages, advanced composite structures have been successfully used for developing severalrimary aircraft structures. One of the certification requirements, as per FAR 25, is to ensure their compliance to the design loads by conducting static tests. Based on the requirements given by the designer, the experiments are conducted. To achieve realistic behavior of the structure in the static test loading and attachments should be properly simulated. This requires considerable time and is a very challenging assignment. The general philosophy is to carryout limited testing, and then uses analytical models to simulate other load cases. A good correlation between testing and analysis is essential to gain confidence in the design of the structure. The total aerodynamic loads are to be distributed as lumped loads without effecting much change in the bending moments and shear forces diagrams. Testing also involves collection of reliable information from strain gauges, dial gauges and acoustic emission sensors. Adequacy of the test rigs and proper simulation of all attachments need to be addressed. The design of the whiffletree to distribute the loads in the desired fashion is one of the key parameters in the testing process. The paper discusses these aspects and the challenges in carrying out static test through a few examples.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Wing Test Box, Static Testing, Out Board Flap, Elevator, Cyclic Load Testing.
    Subjects: CHEMISTRY AND MATERIALS > Composite Materials
    Division/Department: Advanced Composites Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division, Advanced Composites Division
    Depositing User: Ms Indrani V
    Date Deposited: 24 Jan 2012 10:00
    Last Modified: 24 Jan 2012 10:00
    URI: http://nal-ir.nal.res.in/id/eprint/10264

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