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http://dx.doi.org/10.6108/KSPE.2018.22.6.094

Structure Safety Analysis of Composite Lattice Structure with Inspection Window  

Kim, Dong-geon (Design Technology Center, Hankuk Fiber Group)
Bae, Ju-chan (Design Technology Center, Hankuk Fiber Group)
Son, Jo-wha (Defence Department, Hankuk Fiber Group)
Lee, Sang-woo (Defence Department, Hankuk Fiber Group)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.22, no.6, 2018 , pp. 94-103 More about this Journal
Abstract
The purpose of designing composite lattice structure which applied to launching vehicle and tactical missile body is to minimize the thickness and weight for applied load. It is usually made of carbon fiber; fabricating with filament winding process over silicon mold, and provided with a window opening for inspection purpose if necessary. In this paper compression test is conducted without window opening in lattice structure and preliminary FEA is carried out to confirm its accuracy. And then FEA is performed for the case of window opening to evaluate the soundness and the safety factor of the structure. We have calculated for two kinds of window shape; rectangular one and hexagonal one. And we have calculated safety factors of the lattice structure with window opening in every case based on failure strength of rib and knot with varying the thickness and location of the window for hexagonal shape. Through our investigation, we have found out the followings; (1) the hexagonal shaped window is shown higher safety factor than rectangular one, (2) a window in a certain location is shown higher safety factor than others, (3) although the soundness of window structure is improved as increasing its thickness, a window of a certain thickness is shown higher safety factor than others because of stress concentration.
Keywords
Composite Lattice Structure; Filament Winding; Inspection Window; Stress Concentration; Safety Factor;
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