The use of doubler reinforcement in delamination toughness testing

Reeder, James R.; DeMarco, Kevin J.; Whitley, Karen S.

doi:10.1016/j.compositesa.2004.02.021

Cited by 84 publications

(58 citation statements)

References 6 publications

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“…in which B is the specimen width, E is the longitudinal flexural Young's modulus and I is the second moment of area of the specimen arm. For pure mode II [25]…”

Section: Predicted Fatigue Behaviourmentioning

confidence: 99%

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Numerical simulation of fatigue-driven delamination using interface elements

Robinson¹,

Galvanetto²,

Tumino³

et al. 2005

Int. J. Numer. Meth. Engng

147

140

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This paper presents a computational technique for the prediction of fatigue-driven delamination growth in composite materials. The interface element, which has been extensively applied to predict delamination growth due to static loading, has been modified to incorporate the effects of cyclic loading. Using a damage mechanics formulation, the constitutive law for the interface element has been extended by incorporating a modified version of a continuum fatigue damage model. The paper presents details of the fatigue degradation strategy and examples of the predicted fatigue delamination growth in mode I, mode II and mixed mode I/II are presented to demonstrate that the numerical model mimics the Paris law behaviour usually observed in experimental testing

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“…in which B is the specimen width, E is the longitudinal flexural Young's modulus and I is the second moment of area of the specimen arm. For pure mode II [25]…”

Section: Predicted Fatigue Behaviourmentioning

confidence: 99%

“…Damage due to static delamination.When dealing with cyclic load history, an evolution law in terms of the number of cycles is often considered, particularly if we study high-cycle fatigue. A cycle-based formulation can be obtained from(25) by integration over a certain number of loading cycles N t (N+ N) t (N)…”

mentioning

confidence: 99%

Numerical simulation of fatigue-driven delamination using interface elements

Robinson¹,

Galvanetto²,

Tumino³

et al. 2005

Int. J. Numer. Meth. Engng

147

140

View full text Add to dashboard Cite

show abstract

“…The same principles apply for the 3 point ENF (see figure 6(b)), in which the displacement and mode II strain energy release rate before initial crack propagation are given by [29]: …”

Section: (B) 3 Point Enfmentioning

confidence: 99%

Cohesive zone length in numerical simulations of composite delamination

Harper¹,

Hallett²

2008

Engineering Fracture Mechanics

436

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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“…The appearance of damage or plastic yield in the substrates must also be avoided; this is a major difficulty in testing assemblies with metal substrates, as they must not be too thick because analysis is based on beam theory expressions. Reeder et al [91] studied the use of metallic doublers to facilitate testing ductile composites, and this provides a similar case to that of testing metal-metal assemblies. The following expression, given in full in [89], allows specimen thickness to be estimated before testing:…”

Section: Specimen Geometrymentioning

confidence: 99%