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The sandwich shell with Egg-box core has been used for the co mbustion chamber case of air breathing propulsion system. The alteration on pitch length and thickness of Egg-box core was required to be lighter and save manufacturing time and cost of combustion chamber case. In this paper, the finite element analysis method which simulated bendi ng test was used to predict the equivalent shear modulus which affect structural stability of sandwich shell in short time. The result of FE calculation on sandwich panel with homogeneous material, H130-foam core, showed a good agreement with the values available in the reference. The equiv alent shear modulus of Egg-box core according to the variation of pitch length and thickness can be obtained.      -        .     /    -        .    -                      .   H130-                 . -             .Key Words: Equivalent Shear Modulus(  ), Sandwich Panel( ), Egg-box Core(- ), Finite Element Analysis(), Pitch Length( )Received 30 November 2012 / Revised 26 February 2014 / Accepted 6 March 2014

Analytical Study on Equivalent Shear Modulus according to Shape of Egg-box Core