Compound Bifurcations in the Buckling of a Delaminated Composite Strut

Wright, J E

doi:10.1007/s11071-006-0751-0

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…It is important to note that other models-such are asymmetrical dynamic fracture [57], bifurcation [58], discontinuities [59] or contact interaction [60] models-can be also used to explain the physics of investigated nonlinear phenomena. In practice, dynamic behaviour of damaged delaminated plate is much more complicated.…”

Section: Nonlinear Coupling In a Composite Delaminated Plates: Theorementioning

confidence: 99%

Triple correlation for detection of damage-related nonlinearities in composite structures

et al. 2015

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Nonlinear effects in vibration responses are investigated for the undamaged composite plate and the composite plate with a delamination. The analysis is focused on higher harmonic generation in vibration responses for various excitation amplitude levels. This effect is investigated using the triple correlation technique. The dynamics of composite plate was modelled using two-dimensional finite elements and the classical lamination theory. The doubled-node approach was used to model delamination area. Mode shapes and natural frequencies were estimated based on numerical models. Next, the delamination divergence analysis was used to obtain relative displacements for delaminated plies. Experimental modal analysis test was carried out to verify the numerical models. The two strongest vibration modes as well as two vibration modes with the smallest and largest motion level of delaminated plies were selected for nonlinear vibration test. The Fisher criterion was employed to verify The results show that the method can be used not only to reveal nonlinearities, but also to reliably detect impact damage in composites. These results are confirmed using the statistical analysis.

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Section: Nonlinear Coupling In a Composite Delaminated Plates: Theorementioning

confidence: 99%

Triple correlation for detection of damage-related nonlinearities in composite structures

et al. 2015

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“…Delamination can dramatically reduce weight capacity and stability of the constituent materials, thereby increasing the chances of breakage [6]. Logically, the modeling of composite failure behavior has evolved as a primary goal in recent years [7][8][9]. Delamination is one of the most important factors in the layered composites for structures subjected to compressive loads, because, this is buckling will take place at the lower load level [10].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Ply Orientation on Nonlinear Buckling of Aircraft composite Stiffened Panel

Mouhat

Bybi

Bouhmidi

et al. 2019

Frattura Ed Integrità Strutturale

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In this paper the demand for curved stiffened panels composite from carbon fiber reinforced plastics (CFRP) has emerged; these structures are most frequently used in aerospace engineering. Nearly 50% of the primary structure of the Boeing 787 is made up of woven graphite-epoxy. This research emphasizes the buckling analysis of stiffened composite panels using the nonlinear, finite element modelling. The stiffened panel is assumed to be subjected to a uniform axial compression load of 10kN. For the nonlinear buckling analysis, a stiffened composite panel is made of carbon fibre composite (CFC) in epoxy, Kevlar in epoxy and E-glass (EG) in epoxy. Due to the fact that there are many stiffened composite panels materials, this paper therefore uses a numerical approach, to present the study and results of the nonlinear static buckling analysis of I-stiffened, on various composite panels. This research also presented the effect of the different ply orientations using Abaqus finite element analysis (FEA).

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“…Many experimental and numerical results related to the ultimate strength of debonded shells have been published, for example, the studies of Sørensen et al [3,4], Branner and Berring [5], and Benloulo and Sanchez [6]. Modeling of composites failure behavior has become the main objective in studies over the years, as seen in the studies of Gaiotti et al [7], Short et al [8], Li et al [9], and Wright [11]. Delamination is particularly important in sandwich structures under compressive loading because the loss of stiffness leads to failure by buckling [12].…”

Section: Introductionmentioning

confidence: 99%

Symmetrical and Antisymmetrical Sequenced Fibers with Epoxy Resin on Rectangular Reinforced Structures Under Axial Loading

Moheimani¹,

Sarayloo²,

Dalir³

2018

American Society for Composites 2018

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In this study, Finite element Method (FEM) evaluation is performed for the compressive failure of reinforced structures with layered composite shells under axial loading. In addition, embedded delamination between the reinforcing layered composite shells and the core is considered as a defect. The layered composite shells are made of 12 plies of equal thickness of Kevlar, CFC, and E-Glass with epoxy resin. Considering the orientation and laminate, three different layered composite shells, (0°/90°/0°/90°/0°/90°), (45°/-45°/0°/90°/60°/-30°), and (60°/-30°/90°/0°/30°/90°), are considered for symmetrical and antisymmetrical sequences. These results are obtained through ABAQUS simulations and subsequent analysis. The results show that symmetrical and antisymmetrical sequences can be used as an index for quality control and as a safety factor of composite shells produced by the hand lay-up technique in certain industrial processes. The delamination growth is also investigated with the help of cohesive elements. Buckling phenomenon occurred abruptly due to the fast propagation of delamination, having face/core debond.

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Compound Bifurcations in the Buckling of a Delaminated Composite Strut

Abstract: More maths than engineering. Show how simple the model is. Mention the isotropic strut by reference. Focus on the bimaterial strut. Analysis and placement of the bifurcation. Normal form for the bifurcation? Root structure?

Cited by 5 publications

References 15 publications

Triple correlation for detection of damage-related nonlinearities in composite structures

Triple correlation for detection of damage-related nonlinearities in composite structures

The Effects of Ply Orientation on Nonlinear Buckling of Aircraft composite Stiffened Panel

Symmetrical and Antisymmetrical Sequenced Fibers with Epoxy Resin on Rectangular Reinforced Structures Under Axial Loading

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