Initial imperfection effects on postbuckling response of laminated plates under end-shortening strain using Chebyshev techniques

Ghannadpour, S.A.M.; Barekati, M.

doi:10.1016/j.tws.2016.03.028

Cited by 15 publications

(4 citation statements)

References 23 publications

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“…In fact, the delamination defects are prone to occur during the preparation of composite laminates due to porosity or resin debonding. [5][6][7][8][9] As a result, in order to appropriately measure the impact performance and degree of impact damage, it is required to analyze the influence of initial delamination defects on the impact damage behavior and residual strength of laminates.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on behaviors of composite laminates with initial delamination defects under impact and compression after impact

et al. 2022

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The initial delamination defects may arise during the preparation of carbon fiber-reinforced polymer (CFRP) composite laminates, so its effects need to be considered in the evolution of mechanical properties. In this article, the behaviors of composite laminates with initial delamination defects under impact and compression after impact (CAI) are investigated by numerical method. The simulation framework composed of the micromechanics of failure (MMF) theory and the mixed mode exponential cohesive zone model (ECZM) is constructed. The numerical analysis compares the effects of the interaction between four different initial delamination defects and impact loading on impact response and CAI strength at two impact velocity levels (1.336 and 2.314 m/s). Furthermore, the failure mechanisms of laminates with initial delamination defect are disclosed under CAI loading. The findings indicate

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Section: Introductionmentioning

confidence: 99%

Numerical investigation on behaviors of composite laminates with initial delamination defects under impact and compression after impact

et al. 2022

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“…They both extended a model to analyze the postbuckling of perfect stiffened panels in local buckling mode with no damage. Ghannadpour and Barekati, 2016 solved the laminated plate equation by using equivalent finite double Chebyshev polynomials. Karrech et al, 2017 presented a method on the basis of energy conjugacy to analyze thick plates' postbuckling behavior with large geometric imperfections.…”

Section: Introductionmentioning

confidence: 99%

Postbuckling of Marine Stiffened Composite Plates with Initial Geometric Imperfections Using Progressive Failure Analysis

Morshedsolouk

Karimirad

2021

J. Marine. Sci. Appl.

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This work explores the postbuckling behavior of a marine stiffened composite plate in the presence of initial imperfections. The imperfection shapes are derived from buckling mode shapes and their combinations. Thereafter, these imperfection shapes are applied to the model, and nonlinear large deflection finite element and progressive failure analyses are performed in ANSYS 18.2 software. The Hashin failure criterion is employed to model the progressive failure in the stiffened composite plate. The effect of the initial geometric imperfection on the stiffened composite plate is investigated by considering various imperfection patterns and magnitudes. Results show that when the magnitude of the imperfection is 20 mm, the ultimate strength of the stiffened composite plate decreases by 31%. Moreover, global imperfection shapes are found to be fundamental in determining the ultimate strength of stiffened composite plates and their postbuckling. Article Highlights• The effect of initial geometric imperfection mode shapes and magnitude on the ultimate strength of the stiffened composite panels are studied.• The 11 th first buckling mode shapes and a series of combinations of them are assumed as initial geometric imperfections.• The postbuckling and damage are modeled using the progressive damage method and nonlinear finite element method.

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“…To account for delamination effects, displacement field was enriched by adding appropriate terms and the penetration of the delamination surfaces was prevented by incorporating an appropriate contact scheme into the time response analysis. Ghannadpour and Barekati 18 investigated the effects of initial imperfection on post-buckling behaviour of laminated plates subject to end shortening strain using Chebyshev techniques. The post-buckling behavior for both angle-ply and cross-ply composite plates with different boundary conditions was studied and compared with those available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear buckling analysis of damaged laminated composite plates

Onkar

2019

Journal of Composite Materials

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An updated Lagrangian-based nonlinear finite element method is developed to study the buckling behavior of damaged laminated composite plates under uniaxial compression. In this study, material imperfections are treated as existing static damage and a continuum damage mechanics-based approach is used to model such imperfections. The laminated plate is modeled as a set of elementary layers bonded together by matrix-rich elastic interface. This allows to model different modes of damage present at both elementary ply level and interply interface separately. A layerwise plate model is used to model both elementary ply and interface layers of the laminate. The effect of different forms of existing static damage on the limit point loads and the corresponding displacements of laminated plates are studied. It is observed that for the chosen modes and size of the damaged regions, the limit point load does not change much as compared to the undamaged plate. However, the deformed shapes show significant changes and some very interesting phenomena like local wrinkling behaviour of the damaged region is observed. The effect of ply orientation along with different modes of damage on the limit points and the corresponding deformed shapes of laminated plates are also discussed.

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Initial imperfection effects on postbuckling response of laminated plates under end-shortening strain using Chebyshev techniques

Cited by 15 publications

References 23 publications

Numerical investigation on behaviors of composite laminates with initial delamination defects under impact and compression after impact

Numerical investigation on behaviors of composite laminates with initial delamination defects under impact and compression after impact

Postbuckling of Marine Stiffened Composite Plates with Initial Geometric Imperfections Using Progressive Failure Analysis

Nonlinear buckling analysis of damaged laminated composite plates

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