Delamination buckling and postbuckling in composite cylindrical shells under external pressure

Tafreshi, Azam

doi:10.1016/j.tws.2004.05.008

Cited by 36 publications

(25 citation statements)

References 35 publications

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“…Four different materials [16,17] are used to investigate the effect of engineering constants on the optimum shape design of the components. Every component is being treated as a lamina that has four engineering constants E 1 , E 2 , G 12 and  12 with a lamina orientation angle of zero.…”

Section: Numerical Resultsmentioning

confidence: 99%

Optimum Shape Design of Composite Structures Using Boundary-Element Method.

Tafreshi

2005

AIAA Journal

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The boundary element method, combined with a numerical optimisation algorithm, has been employed for the shape optimisation of two-dimensional anisotropic structures. To find the optimum shape of a structure with the highest stiffness, the elastic compliance of the structure has been minimized subject to constraints upon stresses, weight and geometry.The optimum shapes of a series of anisotropic structures are obtained for maximum stiffness and minimum weight and stress, for specified loading conditions. The results are compared with the optimum shapes which were already created by the minimization of the structural weight while satisfying certain constraints upon stresses and geometry. A directly differentiated form of boundary integral equation with respect to geometric design variables is used to calculate shape design sensitivities of anisotropic materials. Because of the nonlinear nature of the mean compliance, weight and stresses, the numerical optimisation algorithm used is the feasible direction method, together with the golden section method for the one-dimensional search. Hermitian cubic spline functions are used to represent boundary shapes which offer considerable advantages in fitting a wide range of curves, and in the automatic remeshing process. Five example problems with anisotropic materialproperties are presented to demonstrate the applications of this general-purpose program.

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Section: Numerical Resultsmentioning

confidence: 99%

Optimum Shape Design of Composite Structures Using Boundary-Element Method.

Tafreshi

2005

AIAA Journal

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“…Although cylinder tubes can fail in multiple ways under combined axial-pressure loadings (Marinucci and de Andrade, 2006;Tafreshi, 2004;Wiggenraad et al, 1996), delamination-type failure was commonly encountered in thick composite cylinders Rasheed and Tassoulas, 2001;Zhao et al, 2000). Potential delamination of the cylinder can be annular delamination (Kachanov, 1988), strip-type delamination and buckling of the delamination regions.…”

Section: Mechanical Behavior Modeling Of Composites Under Combined Lomentioning

confidence: 99%

A review on design, manufacture and mechanics of composite risers

et al. 2016

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Exploration of deeper oceans for oil and gas requires increasingly lightweight solutions. A key enabler in this aspect is the use of fiber-reinforced composite materials to replace metals in risers. However, design synthesis and analyses of composite risers are more challenging than for conventional metals due to the complex behavior and damage mechanisms which composite materials exhibit. Composite risers are predicted to be a high-impact technology that will be mainstream in the medium term but there is still relatively little literature pertaining directly to the behavior of these materials under the complex loading scenarios arising from their use in deep water structures. Therefore there is a need to perform a review and assessment of the available technologies and methodologies in the literature to gain a good understanding of their predictive capabilities, efficiency and drawbacks. This article provides a comprehensive review of published research on manufacture, experimental investigations and numerical analyses of composite risers in deepwater conditions determining the gaps and key challenges for the future to increase their application.

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“…Although cylinder tubes may fail in multiple ways under combined axialpressure loadings (Marinucci and de Andrade, 2006;Tafreshi, 2004;Wiggenraad et al, 1996), delamination-type failure was commonly encountered in thick composite cylinders (Bai et al, 1997;Rasheed and Tassoulas, 2001;Zhao et al, 2000). Potential delamination of the cylinder such as annular delamination (Kachanov, 1988), strip-type delamination (Timoshenko and Gere, 1961) and buckling of the delamination regions were numerically investigated by Theotokoglou (Theotokoglou, 2006).…”

Section: Numerical Analysismentioning

confidence: 99%

Mechanical characterization of yachts and pleasure crafts fillers

Nebbia¹,

Rizzo²,

Caleo³

2015

Analysis and Design of Marine Structures V

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There is accelerating interest in composite risers for deepwater applications. Composite risers offer much higher strength to weight ratios over metallic risers but there is less experience of their behavior in deepwater environments. A general review on current developments specific to composite risers highlighting the remaining challenges and the applications, design evolution, state-of-the-art modeling and experimental techniques is lacking. This paper provides such a review on fiber-reinforced polymer composite risers. The major issues for composite risers are addressed including the complicated combination of loads under harsh deep sea environment, the lack of long-term material degradation database for assessing the reliability of these riser systems and the need of effective numerical models to fully account for complex realistic loading configurations. The paper also highlights current gaps for design and application of composite risers in offshore technology and promising future research areas to help expand their utilization in deeper water.

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Delamination buckling and postbuckling in composite cylindrical shells under external pressure

Cited by 36 publications

References 35 publications

Optimum Shape Design of Composite Structures Using Boundary-Element Method.

Optimum Shape Design of Composite Structures Using Boundary-Element Method.

A review on design, manufacture and mechanics of composite risers

Mechanical characterization of yachts and pleasure crafts fillers

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