Mixed-Mode Fracture in Fiber-Polymer Composite Laminates

Hashemi, S.; Kinloch, A. J.; Williams, Gordon

doi:10.1520/stp17717s

Cited by 53 publications

(49 citation statements)

References 10 publications

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“…As shown in criterion based on a critical Mode I or Mode II crack opening displacement [28] (COD) also failed to produce a response similar to those exhibited by the materials presented herein.…”

Section: New Bilinear Criterionmentioning

confidence: 52%

A Bilinear Failure Criterion for Mixed-Mode Delamination

Reeder

1993

Eleventh Volume: Composite Materials—Testing and Design

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Many different failure criteria have been suggested for mixed-mode delamination toughness, but few sets of mixed-mode data exist that are consistent over the full range of Mode I opening load to Mode II shear load range. The mixed-mode bending (MMB) test was used to measure the delamination toughness of a brittle epoxy composite, a state-of-the-art toughened epoxy composite, and a tough thermoplastic composite over the full mixed-mode range. To gain insight into the different failure responses of the different materials, the delamination fracture surfaces were also examined. An evaluation of several failure criteria that have been reported in the literature was performed, and the range of responses modeled by each criterion was analyzed. A bilinear failurecriterion was introduced based on a change in the failure mechanism observed from the delamination surfaces. The different criteria were compared to the failure response of the three materials tested. The responses of the two epoxies were best modeled with the new bilinear failure criterion. The failure response of the tough thermoplastic composite could be modeled well with the bilinear criterion but could also be modeled with the more simple linear failure criterion. Since the materials differed in their mixed-mode failure response, mixed-mode delamination testing will be needed to characterize a composite material. This paper presents consistent sets of mixed-mode data, provides a critical evaluation of the mixed-mode failure criteria, and should provide general guidance for selecting anappropriate criterion for other materials.

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Section: New Bilinear Criterionmentioning

confidence: 52%

A Bilinear Failure Criterion for Mixed-Mode Delamination

Reeder

1993

Eleventh Volume: Composite Materials—Testing and Design

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“…Wang et al 26 observed that the critical energy release rate for mixed mode loading increases with an increasing mode II loading component. Failure loci have been established by Hashemi et al 5,27 based on a critical crack opening displacement or with an interaction parameter, I i , which varies linearly between 0 and 1 and is a function of the ratio…”

Section: Mixed Mode Failure Criteriamentioning

confidence: 99%

“…Fracture surfaces from coupons tested under different known modes of loading were examined. These known modes of loading were obtained by testing standard fracture mechanics specimens (Double Cantilever Beam (DCB) for mode I tests 1,2 , End Loaded Split (ELS) for mode II tests 3,4,5 , Fixed Ratio Mixed Mode (FRMM) for mixed mode ratio I:II=4:3 tests 3,4,5 and Mixed Mode Bending (MMB) which can be used for any mixed mode loading ratio 6 ) under both static and fatigue loading. The material examined was a carbon fibre/epoxy composite that is manufactured by Ciba Composites (T300/914).…”

Section: Introductionmentioning

confidence: 99%

Mixed-Mode Delamination of Multidirectional Carbon Fiber/Epoxy Laminates

Svensson¹,

Gikhrist

1998

Mech. of Adv. Mat. & Structures

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SUMMARYScanning electron microscopy was used to identify fractographic features that are characteristic of different modes of interlaminar fracture. The cusp angle and the amount of fibre pull-out on the fracture surface can be used to characterise the different loading modes.A large amount of fibre pull-out is the dominant feature of a mode I fracture whilst in mode II large cusp angles and many cusps are the main characteristics. The amount of fibre pullout, and subsequently broken fibres, per unit area was investigated and found to vary in proportion to the degree of mode I loading. Such methods can be used to analyse failure and the propagation of delamination in structural components. The energy associated with cusp formation constitutes a large proportion of the mode II fracture toughness component whilst the amount of fibre pull-out and fracture has a considerable influence on the mode I fracture component. The cusp angle was seen to provide a quantitative measure of the fracture surface roughness. A failure criterion which takes the fracture surface appearance into account was evaluated. The cusp angle was subsequently used to modify this failure criterion. As a consequence, this provided an improved agreement with the experimental data.2

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“…The authors' partition theory based on classical beam theory [6][7][8][9][10] has given excellent predictions of mixed-mode fracture toughness for delamination in generally laminated composite beams [8][9][10] when compared against the experimental test data from some independent comprehensive testing [11][12][13][14][15][16][17][18][19][20]. In comparison, mixed-mode partition theories based on 2D elasticity [1,4] have shown poor correlation with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Partition of mixed-mode fractures in 2D elastic orthotropic laminated beams under general loading

Wood

Harvey

Wang

2016

Composite Structures

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An analytical method for partitioning mixed-mode fractures on rigid interfaces in orthotropic laminated double cantilever beams (DCBs) under through-thickness shear forces, in addition to bending moments and axial forces, is developed by extending recent work by the authors (Harvey et al., 2014). First, two pure through-thickness-shear-force modes (one pure mode I and one pure mode II) are discovered by extending the authors' mixed-mode partition theory for Timoshenko beams. Partition of mixed-mode fractures under pure through-thickness shear forces is then achieved by using these two pure modes in conjunction with two thickness ratio-dependent correction factors: (1) a shear correction factor, and (2) a pure-mode-II energy release rate (ERR) correction factor. Both correction factors closely follow an elegant normal distribution around a symmetric DCB geometry. The principle of orthogonality between all pure mode I and all pure mode II fracture modes is then used to complete the mixed-mode fracture partition theory for a general loading condition, including bending moments, axial forces, and through-thickness shear forces. Excellent agreement is observed between the present analytical partition theory and numerical results from finite element method (FEM) simulations.

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Mixed-Mode Fracture in Fiber-Polymer Composite Laminates

Cited by 53 publications

References 10 publications

A Bilinear Failure Criterion for Mixed-Mode Delamination

A Bilinear Failure Criterion for Mixed-Mode Delamination

Mixed-Mode Delamination of Multidirectional Carbon Fiber/Epoxy Laminates

Partition of mixed-mode fractures in 2D elastic orthotropic laminated beams under general loading

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