Delamination buckling and postbuckling in composite cylindrical shells under external pressure

Composite cylindrical shells and panels are widely used in aerospace structures. These are often subjected to defects and damage from both in-service and manufacturing events. Delamination is the most important of these defects. This paper deals with the computational modelling of delamination buckling and postbuckling of laminated composite cylindrical shells subjected to external pressure. The use of three-dimensional finite elements for predicting the delamination buckling and postbuckling of these structures is computationally expensive. Here, the combined double-layer and single-layer of shell elements are employed to study the effect of delamination on the global load-carrying capacity of such systems under external pressure. It is shown that through-the-thickness delamination can be modelled and analysed effectively without requiring a great deal of computing time and memory. A parametric study is carried out to investigate the influence of the delamination size, orientation and through-the-thickness position of a series of laminated cylinders. The effects of material properties and stacking sequence are also investigated. Some of the results are compared with the corresponding analytical results. It is shown that ignoring the contact between the delaminated layers can result in wrong estimations of the critical buckling loads in cylindrical shells under external pressure.

[1]  George J. Simitses,et al.  Scale models for laminated cylindrical shells subjected to axial compression , 1996 .

[2]  Kunigal N. Shivakumar,et al.  Three-dimensional elastic analysis of a composite double cantilever beam specimen , 1988 .

[3]  Fu-Kuo Chang,et al.  Composite panels containing multiple through-the-width delaminations and subjected to compression. Part I: Analysis , 1995 .

[4]  S. N. Atluri,et al.  Multidomain modeling and analysis of delaminated stiffened composite shells , 1996 .

[5]  Norman F. Knight,et al.  An assessment of shell theories for buckling ofcircular cylindrical laminated composite panels loaded inaxial compression , 1999 .

[6]  Azam Tafreshi,et al.  Shape design sensitivity analysis of 2D anisotropic structures using the boundary element method , 2002 .

[7]  Sarp Adali,et al.  Minimum sensitivity design of laminated shells under axial load and external pressure , 2001 .

[8]  Martyn J Pavier,et al.  A specialized composite plate element for problems of delamination buckling and growth , 1996 .

[9]  Azam Tafreshi,et al.  Effects of local departures from nominal dimensions on stresses in thin torispherical end closures , 1996 .

[10]  Azam Tafreshi.  Shape optimization of two-dimensional anisotropic structures using the boundary element method , 2003 .

[11]  Aditi Chattopadhyay,et al.  New higher order plate theory in modeling delamination buckling of composite laminates , 1994 .

[12]  Fu-Kuo Chang,et al.  Composite panels containing multiple through-the-width delaminations and subjected to compression. Part II: Experiments & verification , 1995 .

[13]  Tong Earn Tay,et al.  Characterization and analysis of delamination fracture in composites: An overview of developments from 1990 to 2001 , 2003 .

[14]  Azam Tafreshi,et al.  Buckling and post-buckling analysis of composite cylindrical shells with cutouts subjected to internal pressure and axial compression loads , 2002 .

[15]  G. Simitses,et al.  Delamination buckling of cylindrical laminates , 1991 .

[16]  G. Simitses,et al.  Delamination buckling of cylindrical shells under axial compression , 1987 .

[17]  George J. Simitses,et al.  Instability of moderately thick, laminated, cylindrical shells under combined axial compression and pressure , 1994 .

[18]  V. Troshin,et al.  Effect of longitudinal delamination in a laminar cylindrical shell on the critical external pressure , 1983 .

[19]  F. Williams,et al.  Reference surface element modelling of composite plate/shell delamination buckling and postbuckling , 2003 .

[20]  Mariusz Pyrz,et al.  Optimal laminations of thin underwater composite cylindrical vessels , 2002 .

[21]  Azam Tafreshi,et al.  Global buckling behaviour and local damage propagation in composite plates with embedded delaminations , 2003 .

[22]  M. S. Hoo Fatt,et al.  Buckling of a non-uniform, long cylindrical shell subjected to external hydrostatic pressure , 2002 .

[23]  Azam Tafreshi,et al.  Numerical analysis of thin torispherical end closures , 1997 .

[24]  J. C. Klug,et al.  Efficient modeling of postbuckling delamination growth in composite laminates using plate elements , 1996 .

[25]  Ning Hu,et al.  Buckling analysis of delaminated laminates with consideration of contact in buckling mode , 1999 .

[26]  John D. Whitcomb.  Three-Dimensional Analysis of a Postbuckled Embedded Delamination , 1989 .

[27]  K. N. Shivakumar,et al.  A virtual crack-closure technique for calculating stress intensity factors for cracked three dimensional bodies , 1988, International Journal of Fracture.

[28]  John L. Tassoulas,et al.  Delamination growth in long composite tubes under external pressure , 2001 .

[29]  W. Knauss,et al.  One dimensional modelling of failure in laminated plates by delamination buckling , 1981 .

[30]  Anthony N. Palazotto,et al.  The Collapse of Composite Cylindrical Panels with Various Thickness using Finite Element Analysis. , 1994 .

[31]  Damodar R. Ambur,et al.  Buckling analysis of anisotropic variable-curvature panels and shells , 1998 .

[32]  V. V. Bolotin.  Delaminations in composite structures: Its origin, buckling, growth and stability , 1996 .

[33]  George J. Simitses,et al.  Buckling of delaminated, long, cylindrical panels under pressure , 1988 .

[34]  Hui-Shen Shen,et al.  Postbuckling of shear deformable cross-ply laminated cylindrical shells under combined external pressure and axial compression , 2001 .

[35]  Delamination buckling and postbuckling of composite cylindrical shells , 1995 .

[36]  Martyn J Pavier,et al.  Delaminations in flat and curved composite laminates subjected to compressive load , 2002 .