Geometry and damage effects in a composite marine T-joint

Dharmawan, F.; Thomson, Rodney S.; Li, Henry; Herszberg, Israel; Gellert, Evan

doi:10.1016/j.compstruct.2004.04.036

Cited by 70 publications

(41 citation statements)

References 4 publications

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“…Failure of composite T-joints has also been studied experimentally from different point of view by many investigators [3,4,[20][21][22][23][24][25][26][27][28][29]. The initiation of delamination in the composite T-joint is almost always initiated on the joint's corner due to the maximum stresses developed in this region.…”

Section: Introductionmentioning

confidence: 99%

A Finite Element and Experimental Analysis of Composite T-Joints Used in Wind Turbine Blades

Wang

Soutis

2018

Appl Compos Mater

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In this study, a finite element failure model was created using ABAQUS to determine the location where delamination is initiated and its subsequent propagation. The effect of fibre-reinforced structures on delamination behaviour was studied. The composite Tjoints were made of glass fabric infused with epoxy resin using a vacuum assisted resin transfer moulding technique. The veil layer and 3D weave techniques were employed to improve the properties in the through-thickness direction that can delay or prevent delamination when in service. All the pull-out tensile tests were conducted in an Instron testing machine using a specially designed test fixture. The 3D weave T-joints were found to have improved performance under both static and fatigue loading. Increasing the static properties increases fatigue life performance. The location for the through-thickness reinforcement plays an important role in extending fatigue life of the T-joints.

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Section: Introductionmentioning

confidence: 99%

A Finite Element and Experimental Analysis of Composite T-Joints Used in Wind Turbine Blades

Wang

Soutis

2018

Appl Compos Mater

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“…Many papers are investigated on the single composite skin T-joints and their improvement [4][5][6][7][8][9][10][11][12][13]. The T-joint connections can have fillers or fillets with no overlaminate as well as thin or thick overlaminates of small or large radius of curvature [14].…”

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confidence: 99%

Behavior and Failure Modes of Sandwich T-Joint Using Cohesive Zone Material Model and Contact Elements

Khalili

Ghaznavi

2012

Appl Compos Mater

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One of the significant concerns of sandwich panels is their joints. T-joint is one the most common joint in sandwich structures. This paper deals with the numerical study of triangle T-joint under static loading. The results of numerical solution obtained by ANSYS modeling are verified with the results of experimental tests obtained in the literature. In general, the results obtained for anticipated failure load by numerical solution with the results of experimental test is in good agreement. Contact elements and cohesive zone material model are used to model the adhesive layer, hence debonding and fracture of adhesive is observed by the numerical modeling. Also, by using a written macro code in the ANSYS software, the ability of damage is explained for the core of sandwich panels; thus both the modes in fracture of T-joints (core shear failure in base panel and debonding of adhesive) are modeled. Core materials consist of Divinycell H100, H160, H250, and HCP70 are used for modeling sandwich panels, so that the function of joint is studied under different conditions of the sandwich core material. Nine different geometrical models are created by changing the base angle of the core triangle. The absorbed energy associated with different segments of the T-joint are used to investigate the effect of joint geometry and core material on the load transfer and failure mode of the T-joint.

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“…Under various loading conditions (mechanical, buckling, cyclic, hydrothermal, low velocity impact, bird strike, underwater explosion, lightning, etc. [2,3,4,5,14,21]), interlaminar normal and shear stresses are generated between the composite plies in these critical regions which cause delaminations/debonds. Delamination/debond reduces the stiffness and strength of the structure as the delaminated area gets larger.…”

Section: Introductionmentioning

confidence: 99%

“…Some other advantageous characteristics of composites are: manufacturing abilities, corrosion resistance etc. [5,12,13]. Therefore, there is an increasing demand for composite materials in wind turbine, aerospace, marine and automobile industries.…”

Section: Introductionmentioning

confidence: 99%

Delamination-Debond Behaviour of Composite T- Joints in Wind Turbine Blades

Gülaşık¹,

Çöker²

2014

J. Phys.: Conf. Ser.

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Abstract. Wind turbine industry utilizes composite materials in turbine blade structural designs because of their high strength/stiffness to weight ratio. T-joint is one of the design configurations of composite wind turbine blades. T-joints consist of a skin panel and a stiffener co-bonded or co-cured together with a filler material between them. T-joints are prone to delaminations between skin/stiffener plies and debonds between skin-stiffener-filler interfaces. In this study, delamination/debond behavior of a co-bonded composite T-joint is investigated under 0° pull load condition by 2D finite element method. Using Abaqus ® commercial FE software, zero-thickness cohesive elements are used to simulate delamination/debond in ply interfaces and bonding lines. Pulling load at 0° is applied and load-displacement behavior and failure scenario are observed. The failure sequence consists of debonding of filler/stringer interface during one load drop followed by a second drop in which the 2 nd filler/stringer debonds, filler/skin debonding and skin delamination leading to total loss of load carrying capacity. This type of failure initiation has been observed widely in the literature. When the debond strength is increased 30%, failure pattern is found to change in addition to increasing the load capacity by 200% before total loss of loading carrying capacity occurs. Failure initiation and propagation behavior, initial and max failure loads and stress fields are affected by the property change. In all cases mixed-mode crack tip loading is observed in the failure initiation and propagation stages. In this paper, the detailed delamination/debonding history in T-joints is predicted with cohesive elements for the first time.

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Geometry and damage effects in a composite marine T-joint

Cited by 70 publications

References 4 publications

A Finite Element and Experimental Analysis of Composite T-Joints Used in Wind Turbine Blades

A Finite Element and Experimental Analysis of Composite T-Joints Used in Wind Turbine Blades

Behavior and Failure Modes of Sandwich T-Joint Using Cohesive Zone Material Model and Contact Elements

Delamination-Debond Behaviour of Composite T- Joints in Wind Turbine Blades

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