Finite Element Simulation and Statistical Analysis of Laminated Composite Shims for Gaps in Aircraft Structures Assembly

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Sanjay Kumar
P. Selvaraj

Abstract

Aerospace grade composite laminated shims are frequently used in aircraft structure assembly of parts made of advance composite materials with High Modulus of AS4 grade. The assembly of composite components requires extensive use of shims compared to metal assembly. The shim use at assembly stage is very time consuming process and poses challenges to maintain the product quality. This paper aims to bring out the statistical and finite element analysis of shims using gaps data taken out of prototype samples. Finite element analysis is carried out without shims and with shims of thickness of 0.8, 1.2 and 2.0 mm. The nature of variation of measured gap and the effect of shims on stress in the wing skin and spar due to static loading are assessed.

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