Fractographic Analysis of Interlaminar Fracture

Bascom, W. D.; Boll, D. J.; Hunston, D. L.; Fuller, B.; Phillips, Peter

doi:10.1520/stp24375s

Cited by 10 publications

(7 citation statements)

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“…It is also seen that the resin is attached around the bottom of the broken fiber. This reveals that the origin of hackle marking might be attributed to yielding at the periphery of fibers during pull-out as concluded in Reference [5]. It can be noticed that the channels left by fiber pull-out have two types, clean surfaces [ Figure 20(e)] and hackle marked on the surfaces [ Figure 20(h)].…”

Section: Fractography Studysupporting

confidence: 64%

“…Therefore, the delamination problem must be understood 397 before safer and more efficient composite structures can be designed. The width tapered double cantilever beam (WTDCB) [1][2][3][4][5][6][7], tapered double cantilever beam (TDCB) [8][9][10] and double cantilever beam (DCB) [7, are popular specimens for characterizing the opening mode interlaminar fracture toughness.…”

Section: Ailurementioning

confidence: 99%

“…Recently, it has been reported that interlaminar fracture toughness increases as the delamination extends [4][5][6][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. This increase in fracture energy also exists in edge notched and center cracked tensile composite materials specimens [62][63][64][65][66][67][68][69] as well as in metals.…”

Section: Ailurementioning

confidence: 99%

“…Johnson and Manalgiri [47] stated that nesting is com- mon in unidirectional layups where fibers migrate during the pressure/temperature cure cycle. Many investigations have observed fiber bridging across the crack opening sufficient to create a tied zone in various composites, such as carbon fiber composites [4,5,[39][40][41], graphite fiber composites [6,37,38,[42][43][44], glass fiber composites [6], short glass fiber SMC composites [35], woven graphite composites and woven Kevlar composites [36]. The specimens used were WTDCB [4][5][6], DCB [35~7], compact tension [60] and double torsion specimens [6,61].…”

Section: Ailurementioning

confidence: 99%

“…Recent fractography study [4,5] suggested that fiber pull-out, matrix fracture and Figure 20 (continued). Scanning electron micrograph of fracture surfaces (crack propagates from the left to the right side of the pictures) (g) channels left by fiber pull-out and fiber break off and (h) channels left by fiber pull-out and fiber break 425 hackle markings are three major features that characterize fracture surfaces.…”

Section: Fractography Studymentioning

confidence: 99%

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Interlaminar Fracture Behavior and Fiber Bridging of Glass-Epoxy Composite Under Mode I Static and Cyclic Loadings

Hwang

Han

1989

Journal of Composite Materials

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Interlaminar fracture behavior of composite materials under static and cyclic loadings has been studied using a width tapered double cantilever beam specimen. The fracture energy is evaluated by compliance, beam and area methods. The comparison results show that the initial fracture energy could be evaluated either by beam or area method while the crack growth resistance could be calculated by compliance method. Increases in the critical load and fracture energy due to fiber bridging are predicted by a power function of fracture area. The interlaminar fatigue crack growth behavior is studied through the constant cyclic strain energy release rate range test. A modification of Paris' power law is made to interpret fatigue crack growth under the influence of fiber bridging. The predicted fatigue life by the modified power law is reasonably close to the experimental data. Fractography study shows that the interlaminar failure mechanism of a composite beam involves fiber breakage, matrix tearing and transverse microcracking as well as the delamination of the layers.

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Section: Fractography Studysupporting

confidence: 64%

Section: Ailurementioning

confidence: 99%

Section: Ailurementioning

confidence: 99%

Section: Ailurementioning

confidence: 99%

Section: Fractography Studymentioning

confidence: 99%

See 3 more Smart Citations

Interlaminar Fracture Behavior and Fiber Bridging of Glass-Epoxy Composite Under Mode I Static and Cyclic Loadings

Hwang

Han

1989

Journal of Composite Materials

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Temperature‐dependent inter‐laminar fracture behavior of waste short carbon fiber embedded glass fiber/epoxy composites

2023

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Delamination is one of the life‐limiting failure modes for fiber reinforced polymer (FRP) composite composites resulting in poor damage tolerance, as this failure mode occurs at considerably lower loads. Owing to the enormous demand and mass production of FRP composites, a large amount of fiber waste is produced worldwide. This triggers concern about utilizing these fiber wastes for some valuable applications. The present study aims to improve the overall damage tolerance of laminated glass/epoxy composites via the introduction of waste short carbon fibers (SCFs) reinforcement in the epoxy matrix. The effect of various SCF contents (0.1, 0.3, and 0.5 wt%) in glass fiber/epoxy composites were evaluated experimentally for their interlaminar fracture toughness in terms of both crack development and propagation under mode I and II interlaminar fracture toughness tests, at elevated temperatures (30, 50, and 70°C). Based on the experimental results, glass/epoxy composite with 0.1 wt% of SCF revealed 13.49% and 20.45% increment in mode I and II interlaminar fracture toughness, respectively, at ambient temperature. A positive reinforcement effect could be noticed for GIC and GIIC values up to 50°C. However, due to residual interfacial stresses, interfacial debonding, and epoxy softening, a negative reinforcement effect could be noticed at 70°C. Delamination initiation and crack propagation mechanisms have been explored at elevated temperatures. Fractographic studies have been carried out using a scanning electron microscope to identify the failure mechanisms.

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