Study of Interlaminar Fracture Toughness Improvement on Stitched CFRP Laminates.

Iwahori, Yutaka; Ishikawa, Takashi; Hayashi, Youichi; Watanabe, Naoyuki

doi:10.6089/jscm.26.90

Cited by 15 publications

(3 citation statements)

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“…The findings align with the conclusions reported in the literature where fiber bridging is mainly used to achieve interlayer toughening in the form of stitching in the composite laminates. 62,63…”

Section: Crack Growth Speedmentioning

confidence: 99%

Investigation on interlayer debonding behavior of unidirectional composite laminates under cyclical hygrothermal aging duration effects

Zhang,

Hu,

Fang

et al. 2024

Polymer Composites

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The composite interlamination is the key part of load transfer and plays a decisive role in the overall mechanical performance of composite structures. The interlaminar property is predominantly influenced by the matrix resin which is easily affected by the hygrothermal environment. This paper delved into the effect of hygrothermal aging duration on the interlayer debonding behavior of unidirectional (UD) laminates. The pre‐cracked specimens were treated by hygrothermal aging with a period of 0, 15, 30, 60, 90, and 120 days. The double cantilever beam (DCB) tests were employed to evaluate the interlaminar property. The effect of hygrothermal aging on load–displacement responses, R‐curves, crack growth speed, and fracture surface topography was analyzed. The results revealed that the load‐bearing capacity of aged specimens presented a reduction of 18.6%–29.0% compared with unaged ones. The interlaminar fracture toughness of specimens subjected to 15 days of treatment decreased significantly compared with that of unaged specimens due to the increase of water absorption caused by hygrothermal aging. With the increase in hygrothermal aging time, the interlaminar fracture toughness peaked at 60 days because of the post‐curing effect, followed by a declining trend influenced by the dominant hygrothermal aging effect. The fiber bridging of aged samples was increasingly obvious, became the most prominent at 60 days, and then gradually reduced. The fiber bridging diminished the crack propagation speed, hindered interlaminar debonding, and contributed to the interlaminar toughening.Highlights The samples underwent hygrothermal aging for 0, 15, 30, 60, 90, and 120 days. Load ability of aged samples was at least 18.6% lower than that of unaged ones. R‐curves rose before the crack length of 79 mm and then tended to stabilize. Fracture toughness first decreased, then increased and reduced with aging time. Fiber bridging could hinder crack growth and improve the interlayer property.

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Section: Crack Growth Speedmentioning

confidence: 99%

Investigation on interlayer debonding behavior of unidirectional composite laminates under cyclical hygrothermal aging duration effects

Zhang,

Hu,

Fang

et al. 2024

Polymer Composites

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show abstract

“…After the experiment, loads, COD, and check lengths at moments when the load suddenly dropped were measured. From these data sets, G I was calculated by the area method [10]. The first load drop in one specimen was ignored because it was affected by a dull initial artificial crack tip.…”

Section: -D Orthogonal Interlocked Fabric Composite (3-d Oifc)mentioning

confidence: 99%

“…It is known that the presence of z-fibers increases the interlaminar fracture toughness of such materials [9]. Moreover, one of the authors has conducted an experimental study of the interlaminar delamination toughness of stitched CFRP laminates [10]. That study indicated that the interlaminar toughness of stitched CFRP laminates was significantly larger than that of un-stitched laminates, and that the Mode I strain energy release rate (G I ) increased as the stitch density increased.…”

Section: Introductionmentioning

confidence: 96%

DCB test simulation of stitched CFRP laminates using interlaminar tension test results

Iwahori

Nakane

Watanabe

2009

Composites Science and Technology

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Prediction of Mode I interlaminar fracture toughness of stitched flax fiber composites

et al. 2017

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Study of Interlaminar Fracture Toughness Improvement on Stitched CFRP Laminates.

Cited by 15 publications

References 0 publications

Investigation on interlayer debonding behavior of unidirectional composite laminates under cyclical hygrothermal aging duration effects

Investigation on interlayer debonding behavior of unidirectional composite laminates under cyclical hygrothermal aging duration effects

DCB test simulation of stitched CFRP laminates using interlaminar tension test results

Prediction of Mode I interlaminar fracture toughness of stitched flax fiber composites

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