The use of initial imperfection approach in design process and buckling failure evaluation of axially compressed composite cylindrical shells

Abstract Thin-walled cylindrical shells are susceptible to buckling failures caused by the axial compressive loading. During the design process or the buckling failure evaluation of axially-compressed cylindrical shells, initial geometric and loading imperfections are of important parameters for the analyses. Therefore, the engineers/designers are expected to well understand the physical behaviours of shell buckling to prevent unexpected serious failure in structures. In particular, it is widely reported that no efficient guidelines for modelling imperfections in composite structures are available. Knowledge obtained from the relevant works is open for updates and highly sought. In this work, we study the influence of imperfections on the critical buckling of axially compressed cylindrical shells for different geometries and composite materials (Glass Fibre Reinforced Polymer (GFRP), Carbon Fibre Reinforced Polymer (CFRP)) and aluminium using the finite element (FE) analysis. Two different imperfection techniques called eigenmode-affine method and single perturbation load approach (SPLA) were adopted. Validations of the present results with the published experimental data were presented. The use of the SPLA for introducing an imperfection in axially compressed composite cylindrical shells seemed to be desirable in a preliminary design process and an investigation of a buckling failure. The knockdown factors produced by the SPLA were becoming attractive to account for uncertainties in the structure.

[1]  Mark W. Hilburger,et al.  Comparison of Methods to Predict Lower Bound Buckling Loads of Cylinders Under Axial Compression , 2010 .

[2]  Mark W. Hilburger,et al.  Shell Buckling Design Criteria Based on Manufacturing Imperfection Signatures , 2003 .

[3]  B.T. Hang Tuah bin Baharudin,et al.  Improvement of Cylinder Buckling Knockdown Factor through Imperfection Sensitivity , 2013 .

[4]  Raimund Rolfes,et al.  Robust design of composite cylindrical shells under axial compression — Simulation and validation , 2008 .

[5]  David R.H. Jones,et al.  Buckling failures of pressurised vessels—Two case studies , 1994 .

[6]  Chiara Bisagni,et al.  Perturbation-based imperfection analysis for composite cylindrical shells buckling in compression , 2013 .

[7]  Richard Degenhardt,et al.  Exploring the constancy of the global buckling load after a critical geometric imperfection level in thin-walled cylindrical shells for less conservative knock-down factors , 2013 .

[8]  P. Seide,et al.  Buckling of thin-walled circular cylinders , 1968 .

[9]  Jacek Tejchman,et al.  Failure of cylindrical steel silos composed of corrugated sheets and columns and repair methods using a sensitivity analysis , 2011 .

[10]  James H. Starnes,et al.  Future directions and challenges in shell stability analysis , 1997 .

[11]  Jin-Guang Teng,et al.  On the buckling failure of a pressure vessel with a conical end , 2000 .

[12]  Rolf Zimmermann,et al.  Geometric imperfections and lower-bound methods used to calculate knock-down factors for axially compressed composite cylindrical shells , 2014 .

[13]  Richard Degenhardt,et al.  Numerical characterization of imperfection sensitive composite structures , 2014 .

[14]  Chiara Bisagni,et al.  Numerical analysis and experimental correlation of composite shell buckling and post-buckling , 2000 .

[15]  Richard Degenhardt,et al.  Investigations on imperfection sensitivity and deduction of improved knock-down factors for unstiffened CFRP cylindrical shells , 2010 .

[16]  Herbert Schmidt,et al.  Stability of steel shell structures General Report , 2000 .