Fracture behaviour of composite maritime T-joints

Li, H.C.H.; Dharmawan, F.; Herszberg, Israel; John, Sabu

doi:10.1016/j.compstruct.2006.04.052

Cited by 43 publications

(21 citation statements)

References 7 publications

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“…A virtual crack closure technique (VCCT) is also used to predict the failure of out-of-plane joints. Li et al [15] have conducted FEA using VCCT to investigate the fracture behavior of a glass fiber reinforced polymer T-joint under tensile load, including initial disbond, crack growth mechanism and further failure loads obtained from the strain energy release rate (SERR) at disbond tips. Experiments have been carried out to validate the VCCT as a tool for assessing the fracture behavior and damage criticality of such out-of-plane joints.…”

Section: Introductionmentioning

confidence: 99%

An average failure index method for the tensile strength prediction of composite adhesive-bonded π joints

Zhang

Shan

Zhao

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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An average failure index method based on accurate FEA was proposed for the tensile strength prediction of composite out-of-plane adhesive-bonded π joints. Based on the simple and independent maximum stress failure criterion, the failure index was introduced to characterize the degree of stress components close to their corresponding material strength. With a brief load transfer analysis, the weak fi llers were prominent and further detailed discussion was performed. The maximum value among the average failure indices which were related with different stress components was filtrated to represent the failure strength of the critical surface, which is either the two curved upside surfaces or the bottom plane of the fi llers for composite π joints. The tensile strength of three kinds of π joints with different material systems, confi gurations and lay-ups was predicted by the proposed method and corresponding experiments were conducted. Good agreements between the numerical and experimental results give evidence of the effectiveness of the proposed method. In contrast to the existed time-consuming strength prediction methods, the proposed method provides a capability of quickly assessing the failure of complex out-of-plane joints and is easy and convenient to be widely utilized in engineering.

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Section: Introductionmentioning

confidence: 99%

An average failure index method for the tensile strength prediction of composite adhesive-bonded π joints

Zhang

Shan

Zhao

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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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].…”

mentioning

confidence: 99%

“…In the most of previous numerical studies [5][6][7][8][9][10][11][12][13][14][15][16][17][18]20], adhesive failure, propagation of cracks in the adhesive and separation of joint elements or core shear failure are not modeled, so their analysis are not able to model the fracture modes or are not able to anticipate maximum failure load. On the other hand, the foam which is used by Toftegaard and Lystrup [14] had low shear strength.…”

mentioning

confidence: 99%

“…Generally, high radius of the fillet and small thickness of the overlaminate may increase performance of the composite T-joint. Dharmawan et al [9,10] studied the behavior of the triangle T-joint under tensile pull-off loading in the leg panel. They found that the presence of a disbond altered the distribution of the axial strain through the thickness of the overlaminate.…”

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confidence: 99%

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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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“…In cases where complex geometries and non-isotropic materials are present, accompanied with material and geometry non-linearity, numerical solutions are mostly preferred. Under the framework of Finite Element Methods (FEM), fracture mechanics can be utilized to assess the structural integrity of adhesively bonded joints (Li et al, 2006;Khoshravan and Mehrabadi, 2012). Most of these approaches are based on comparisons of a parameter (a function of load and geometry), usually the strain energy release rate Gi or Ji (i = Mode I, II and III), with the fracture toughness (Gci or Jci).…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of static load capacity of AL-GFRP adhesively bonded single lap and double butt lap joints

Goudarzi

Khedmati

2015

Lat. Am. j. solids struct.

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This paper is focused on experimental evaluation and comparison of progressive damage behaviors in adhesively bonded single lap and double butt lap joints between aluminum and glass fiber reinforced plastic (GFRP). The effect of joint design and dissimilarity of adherents on damage evolution of adhesive bonding under tensile quasi static loading is analyzed. Bonding was created by toughened epoxy adhesive as one of the most important and widely used structural adhesives in aerospace, automobile and marine industries. Due to structural behaviour complexity of adherents and adhesive, the fracture takes place under mixed mode and the failure mechanism is characterized by the de-bonding area for the proposed joints. The results show that single lap joint could carry up to 30% more tensile load than the double butt lap joint with the same material properties while a combined failure mechanism could be observed and the most dominant ones were yielding of aluminum substrates, adhesive failure at bond-line on aluminum surface and cohesive failure of upper mat layers of composite material.

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Fracture behaviour of composite maritime T-joints

Cited by 43 publications

References 7 publications

An average failure index method for the tensile strength prediction of composite adhesive-bonded π joints

An average failure index method for the tensile strength prediction of composite adhesive-bonded π joints

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

An experimental investigation of static load capacity of AL-GFRP adhesively bonded single lap and double butt lap joints

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