Effect of Helical Winding Angle on External Pressure based Buckling of Partially Filled Thin Composite Cylindrical Shells

A P Dash; R Velmurugan; M S R Prasad

doi:10.14429/dsj.69.12634

A P Dash DRDO-Defence Research and Development Laboratory, Hyderabad – 500 058
R Velmurugan Department of Aerospace Engineering, Indian Institute of Technology, Madras – 600 036
M S R Prasad DRDO-Defence Research and Development Laboratory, Hyderabad – 500 058

DOI: https://doi.org/10.14429/dsj.69.12634

Keywords: Winding angle dependency on shell buckling, Composite shell buckling with elastic fillers, external pressure buckling of composite shells

Abstract

Effect of helical winding angle on buckling load of thin composite tubes is investigated in this work. Experiments are conducted on both empty and partially filled S2 glass tubes to estimate contribution of strength to the tubes by the filler material. Chosen filler material mechanically simulates behavior of typical solid propellant used in aerospace application. FE analysis with non-linear effect correlates well with the experimental data. Three series of experiments are conducted to quantify effect of helical winding angle and increase in volumetric loading fraction(VLF). Results confirm appreciable improvement in strength of filled tubes for higher VLF. For the chosen pattern of winding, lower winding angle provides more strength to the tubes against external pressure buckling.

Author Biographies

A P Dash, DRDO-Defence Research and Development Laboratory, Hyderabad – 500 058

Mr A.P. Dash is presently project Director of a Naval Project & Scientist ‘G’ at DRDL, Hyderabad, India. He works in the area of propulsion system and composite structure design. He is presently pursuing PhD at Aerospace Engg at IIT Madras.

Contribution in the current study: Carrying out all experiments and FE studies to generate the results.

R Velmurugan, Department of Aerospace Engineering, Indian Institute of Technology, Madras – 600 036

Prof. R. Velmurugan is a professor at composite Technology Centre of Aerospace Engg. Department of IIT Madar, Chennai, India. He specialises in experimental & Analysis of composite structures.

Contribution in the current study: Guiding and defining all the experiments and scrutinising the results.

M S R Prasad, DRDO-Defence Research and Development Laboratory, Hyderabad – 500 058

Mr M.S.R. Prasad is presently the Director General (MSS) of DRDO and Distinguished Scientist. He specialises in the area of structural analysis and design.

Contribution in the Current Study: Guiding in the area of FE modelling and scrutinising of all FE analysis results.

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