A concise interface constitutive law for analysis of delamination and splitting in composite materials and its application to scaled notched tensile specimens

Jiang, Wenguang; Hallett, Stephen R.; Green, Ben G.; Wisnom, Michael R

doi:10.1002/nme.1842

Cited by 251 publications

(166 citation statements)

References 23 publications

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“…Over recent years, they have become increasingly used for modelling composites, particularly in relation to delamination [1,2,3,4,5,6,7] and adhesive bond-line failure [8,9,10,11]. Compared with alternative analysis techniques such as the Virtual Crack Closure Technique (VCCT), they offer the advantages of encompassing both crack initiation and crack propagation and the ability to model multiple crack paths, without the need for computationally expensive crack-path following algorithms.…”

Section: Introductionmentioning

confidence: 99%

Cohesive zone length in numerical simulations of composite delamination

Harper¹,

Hallett²

2008

Engineering Fracture Mechanics

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435

287

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Abstract:Accurate analysis of composite delamination using interface elements relies on having sufficient elements within a softening region known as the cohesive zone ahead of a crack tip. The present study highlights the limitations of existing formulae used to predict numerical cohesive zone length and demonstrates modifications necessary for improved accuracy. Clarification is also provided regarding the minimum number of interface elements within the cohesive zone. Finally, appropriate values of numerical interfacial strength are examined. The results presented will aid the application of mesh design techniques that both preserve numerical accuracy, whilst minimising computational expense. Where applicable, subscripts I, II and m are used to denote properties under mode I, mode II and mixed mode loading respectively. Keywords

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Section: Introductionmentioning

confidence: 99%

Cohesive zone length in numerical simulations of composite delamination

Harper¹,

Hallett²

2008

Engineering Fracture Mechanics

Self Cite

435

287

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show abstract

“…Numerical analysis techniques include the Virtual Crack Closure Technique (Rybicki and Kanninen, 1977;Krueger, 2004) and the use of interface elements, which are specialised finite elements placed along potential failure planes and used to simulate crack growth (Camanho et al, 2003;Jiang et al, 2007;Hallett, 2007). A key advantage of interface elements is that they can encompass both strength based damage initiation criteria and fracture based crack propagation criteria.…”

Section: Figure 2: the Structural Design Process For Tidal Turbine Blmentioning

confidence: 99%

“…Since this paper is intended primarily to demonstrate how the interface element modelling technique can be integrated with the blade design process, only a brief overview of the interface element's numerical formulation is provided and the reader is encouraged to consult Jiang et al (2007) and Harper and Hallett (2010) for more detailed information on the static and fatigue formulations respectively.…”

Section: Principles Of Numerical Modelmentioning

confidence: 99%

“…The constitutive law for static load cases (Jiang et al, 2007) has recently been extended to enable material degradation and failure under cyclic loading (Harper and Hallett, 2010). The fatigue degradation law is designed to simulate the Paris Law for crack growth, which has become commonly used to characterise both delamination and adhesive bondline failure under fatigue loading.…”

Section: Figure 4: the Mixed Mode Traction-displacement Lawmentioning

confidence: 99%

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Advanced numerical modelling techniques for the structural design of composite tidal turbine blades

Harper

Hallett

2015

Ocean Engineering

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Abstract:Tidal Stream turbine blades must withstand both extreme one-off loads and severe fatigue loads during their 20-25 year required lifetimes in harsh marine environments. This necessitates the use of high-strength fibre reinforced composite materials to provide the required stiffness, strength and fatigue life, as well as resistance to corrosion, whilst minimising the mass of material required for blade construction and allowing its geometric form to provide the required hydrodynamic performance. Although composites provide superior performance to metals, potential failure mechanisms are more complicated and difficult to predict. A dominant failure mechanism is interfacial failure (delamination) between the composite layers (plies). This paper demonstrates how the development of numerical techniques for modelling the growth of interfacial cracks can aid the design process, allowing the effects on crack growth from potential manufacturing defects and the effect of stacking sequence of composite plies to be analysed. This can ultimately lead to reduced design safety margins and a reduction in the mass of material required for blade manufacture, essential for reducing lifecycle costs. Although the examples provided in this article are specific to tidal turbine blades, the analysis techniques are applicable to all composite structures where fatigue delamination is a primary failure concern.

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“…Thus, the micromechanical phenomenon that ply cracks tend to propagate in fiber direction can be incorporated at mesolevel. One way to implement this is to model the split with interface elements (see Wisnom and Chang 2000;Yang and Cox 2005;Hallett and Wisnom 2006b;Jiang et al 2007). In that case, however, cracks may only appear between elements, which may complicate mesh generation.…”

Section: Introductionmentioning

confidence: 99%

A phantom node formulation with mixed mode cohesive law for splitting in laminates

2009

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A phantom node method with mixed mode cohesive law is proposed for the simulation of splitting in laminates. With this method, a discontinuity in the displacement field can be modeled at arbitrary locations. The micromechanical phenomenon that splitting cracks grow parallel to the fiber, is incorporated on the mesolevel, i.e., in the homogenized ply, by setting the direction of the crack propagation equal to the fiber direction. A new mixed mode cohesive law is introduced for increased robustness of the incremental-iterative solution procedure. The model is validated with mixed mode bending tests, and its utility is illustrated with examples for a single ply and for a laminate.

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A concise interface constitutive law for analysis of delamination and splitting in composite materials and its application to scaled notched tensile specimens

Cited by 251 publications

References 23 publications

Cohesive zone length in numerical simulations of composite delamination

Cohesive zone length in numerical simulations of composite delamination

Advanced numerical modelling techniques for the structural design of composite tidal turbine blades

A phantom node formulation with mixed mode cohesive law for splitting in laminates

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