Numerical investigation into multi-delamination failure of composite T-piece specimens under mixed mode loading using a modified cohesive model

Chen, Jiye; Fox, Dominic

doi:10.1016/j.compstruct.2011.12.030

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…Where, is the damaged elasticity matrix formulated mathematically based on scalar damage approach defined in Equation 7, which was proposed by previous researchers including [27][28][29][30][31][32][33] (1 )…”

Section: An Ageing Concrete Materials Modelmentioning

confidence: 99%

Experimental and modelling investigation of mechanical behaviour of ageing concrete

Mamand

Chen

Barnett

2017

Construction and Building Materials

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To be able to investigate an ageing concrete behaviour a material model is developed by this investigation in terms of tested material samples taken from the ageing concrete structure. The splitting tensile test is modified with a lateral expansion measurement rig to observe the load-displacement response in the splitting test. A set of material properties is determined based on experimental work and successfully used to create a material damage model for investigating the mechanical behaviour of the ageing concrete. A FEA model with this developed ageing concrete material model (ACMM) is used in simulation of selected concrete core sample tests including the splitting test. Comparison between tests and modelling simulations shows that the developed ageing concrete material model is working well. The outcomes from this investigation supplies an approach to widely investigate engineering materials with ageing problems.

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Section: An Ageing Concrete Materials Modelmentioning

confidence: 99%

Experimental and modelling investigation of mechanical behaviour of ageing concrete

Mamand

Chen

Barnett

2017

Construction and Building Materials

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“…In the general mixed damage mode case, two quadratic formulas given in previous work [18][19] Firstly, assume the amount of total damage scale in mixed facture mode case equals the value of damage scale in the pure single mode I case. This can be expressed by equ.…”

Section: (17)mentioning

confidence: 99%

An extended cohesive damage model with a length scale in fracture analysis of adhesively bonded joints

Chen

2014

Engineering Fracture Mechanics

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This paper introduced an extended cohesive damage model (ECDM) in fracture analysis of adhesively bonded joints. A length scale of pore size at joints was introduced in the accumulation of damages in the proposed ECDM. This micro damage scale based model was used to build up an extended cohesive finite element modelling of adhesively bonded joints at a macro level. An adhesive damage law (ADL) was used to simulate debonding at interfaces. A cohesive damage law (CDL) was proposed to simulate internal cohesive cracks. These two micro damage laws firstly considered the length scale influence from the interfacial pores and internal particles. These ECDM models were used to deal with the stress discontinue problems at interfaces or internal materials. As an example, an adhesively bonded bone-cement joint was investigated in this paper. The failure mechanism of bone-cement joint under tension, with different bonding qualities, was studied using the developed ECDM models. This investigation indicated that the effect of bonding quality on the loading capacity of bone-cement joint can be studied properly by the ECDM with a length scale of interfacial pore size. This ECDM based damage modelling technique supplied an effective and efficient approach in cohesive and adhesive damage analysis.

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“…The literature survey of T-joints shows that filler region and flange tips are the critical locations for delamination/debond initiation. Two of the major initiation mechanisms observed in the literature are the debond of the filler/stringer interface [10,19,23] as shown in Figure 3 and the delamination of plies in the stringer laminate at the curved region [1,3,4,6] as shown in Figure 4. …”

Section: Critical Regions In T-joints For Delamination/debondmentioning

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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Numerical investigation into multi-delamination failure of composite T-piece specimens under mixed mode loading using a modified cohesive model

Cited by 20 publications

References 14 publications

Experimental and modelling investigation of mechanical behaviour of ageing concrete

Experimental and modelling investigation of mechanical behaviour of ageing concrete

An extended cohesive damage model with a length scale in fracture analysis of adhesively bonded joints

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

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