Delamination buckling and growth of flat, cross-ply laminates

Sallam, S.; Simitses, George J.

doi:10.1016/0263-8223(85)90033-9

Cited by 98 publications

(18 citation statements)

References 3 publications

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“…The study showed that the compression strength reduction caused by a debond can be explained by two mechanisms: First from the interaction of local debond and global column buckling and secondly from the development of a damage zone at the debond crack tip. Only a few works have in detail assessed determination of fracture parameters like energy release rate, phase angle and debond propagation in composite and sandwich structures subjected to in-plane loading [Sallam and Simitses 1985;Avilés and Carlsson 2007;Nøkkentved et al 2005;Berggreen and Simonsen 2005]. The first of these papers presented a one dimensional model to estimate the delamination buckling load and ultimate load-carrying capacity of axially loaded composite plates, while the other three focused on sandwich panels containing two-dimensional embedded debonds.…”

Section: Introductionmentioning

confidence: 99%

Failure investigation of debonded sandwich columns: An experimental and numerical study

Moslemian

Berggreen

Carlsson

et al. 2009

JOMMS

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Failure of compression loaded sandwich columns with an implanted through-width face/core debond is examined. Compression tests were conducted on sandwich columns containing implemented face/core debonds. The strains and out-of-plane displacements of the debonded region were monitored using the digital image correlation technique. Finite element analysis and linear elastic fracture mechanics were employed to predict the critical instability load and compression strength of the columns. Energy release rate and mode mixity were determined and compared to fracture toughness data obtained from TSD (tilted sandwich debond) tests, predicting propagation loads. Instability loads of the columns were determined from the out-of-plane displacements using the Southwell method. The finite element estimates of debond propagation and instability loads are in overall agreement with experimental results. The proximity of the debond propagation loads and the instability loads shows the importance of instability in connection with the debond propagation of sandwich columns.

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Section: Introductionmentioning

confidence: 99%

Failure investigation of debonded sandwich columns: An experimental and numerical study

Moslemian

Berggreen

Carlsson

et al. 2009

JOMMS

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“…Liew et al [11] investigated on pretwisted conical shell to find out the vibratory characteristics of stationary conical shell by using Ritz procedure and by using the same method, the first known three dimensional continuum vibration analysis including full geometric non-linearities and centrifugal accelerations in composite blades was carried out by McGee and Chu [19]. The work on delamination buckling and growth of flat cross-ply laminates was also investigated by Sallam and Simitses [24]. Regarding delamination model, two worth mentioning investigations were carried out.…”

Section: Introductionmentioning

confidence: 99%

Effect of Location of Delamination on Free Vibration of Cross-Ply Conical Shells

Dey

Karmakar

2012

Shock and Vibration

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Abstract. Location of delamination is a triggering parameter for structural instability of laminated composites. In this paper, a finite element method is employed to determine the effects of location of delamination on free vibration characteristics of graphite-epoxy cross-ply composite pre-twisted shallow conical shells. The generalized dynamic equilibrium equation is derived from Lagrange's equation of motion neglecting Coriolis effect for moderate rotational speeds. The formulation is exercised by using an eight noded isoparametric plate bending element based on Mindlin's theory. Multi-point constraint algorithm is utilized to ensure the compatibility of deformation and equilibrium of resultant forces and moments at the delamination crack front. The standard eigen value problem is solved by applying the QR iteration algorithm. Finite element codes are developed to obtain the numerical results concerning the effects of location of delamination, twist angle and rotational speed on the natural frequencies of cross-ply composite shallow conical shells. The mode shapes are also depicted for a typical laminate configuration. Numerical results obtained from parametric studies of both symmetric and anti-symmetric cross-ply laminates are the first known non-dimensional natural frequencies for the type of analyses carried out here.

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“…Eigenvector also can be obtained and it shows the mode of buckling. Using this method, the structure can be assumed as linear until it reaches the instability point [2].…”

Section: Linear Buckling Analysismentioning

confidence: 99%

“…This will reduce the strength of composite material due to compressive loading. Sallam and Simitsess (1984) performed one dimensional buckling and post buckling analysis on cross-ply laminate that have delamination to calculate buckling loads. Parlapali, Shu, and Chai (2008) have developed the analytical model with Euler Bernoulli and Classical Lamination Theory basis to analyze buckling on composite beam with two delamination lower and upper bounds.…”

Section: Introductionmentioning

confidence: 99%

Buckling Analysis of Single and Multi Delamination In Composite Beam Using Finite Element Method

Simanjorang

Syamsudin

Suada

2018

J. Phys.: Conf. Ser.

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Delamination buckling and growth of flat, cross-ply laminates

Cited by 98 publications

References 3 publications

Failure investigation of debonded sandwich columns: An experimental and numerical study

Failure investigation of debonded sandwich columns: An experimental and numerical study

Effect of Location of Delamination on Free Vibration of Cross-Ply Conical Shells

Buckling Analysis of Single and Multi Delamination In Composite Beam Using Finite Element Method

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