Interpreting the stress ratio effect on delamination growth in composite laminates using the concept of fatigue fracture toughness

Yao, Liaojun; Alderliesten, R.C.; Benedictus, Rinze

doi:10.1016/j.compositesa.2015.08.005

Cited by 25 publications

(28 citation statements)

References 18 publications

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“…It has demonstrated that a steady state exists in fatigue delamination growth [20]. This can be applied here to explain the differences and similarities illustrated in Fig.7.…”

Section: Energy Balance Analysis On Fatigue Delamination Growthmentioning

confidence: 70%

“…Crack growth is an energy dissipation process obeying the physics laws on energy conservation. In the previous studies [19,20], energy balance principles have been applied to analyze fatigue delamination growth behavior in composite materials, expressed in terms of energy dissipation rate dU/dN against crack growth rate da/dN. This analysis takes advantage of clear physics background by directly correlating fatigue delamination growth with the amount of strain energy release actually used in crack increment.…”

Section: Energy Balance Analysis On Fatigue Delamination Growthmentioning

confidence: 99%

“…This is far away from the requirements of in-depth understanding of this phenomenon. Therefore, Yao et al [18][19][20] systematically investigated the role of fibre bridging in fatigue delamination growth via both experimental and theoretical approaches. They not only drew conclusions that fibre bridging can significantly decrease fatigue crack growth, but also found there is a plateau state in fibre bridging development.…”

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confidence: 99%

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Stress ratio dependence of fibre bridging significance in mode I fatigue delamination growth of composite laminates

Yao

Sun

Zhao

et al. 2017

Composites Part A: Applied Science and Manufacturing

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This paper aims to investigate stress ratio effect on fibre bridging significance in mode I fatigue delamination growth of composite materials. Fatigue resistance curves (R-curves) of different stress ratios are determined and compared with the quasi-static R-curve. The fatigue R-curve of a high stress ratio is similar to the quasi-static results. However, fatigue resistance of a low stress ratio is smaller than quasi-static resistance. These indicate that fibre bridging significance is stress ratio dependent. More bridging fibres can be generated in delamination of a high stress ratio, as compared to that of a low stress ratio. This can lead to fatigue bridging laws are stress ratio dependent and fatigue delamination is block load sequence dependent.

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“…It has demonstrated that a steady state exists in fatigue delamination growth [20]. This can be applied here to explain the differences and similarities illustrated in Fig.7.…”

Section: Energy Balance Analysis On Fatigue Delamination Growthmentioning

confidence: 70%

Section: Energy Balance Analysis On Fatigue Delamination Growthmentioning

confidence: 99%

mentioning

confidence: 99%

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Stress ratio dependence of fibre bridging significance in mode I fatigue delamination growth of composite laminates

Yao

Sun

Zhao

et al. 2017

Composites Part A: Applied Science and Manufacturing

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“…[16,17,26,27] These two concepts deal with a crack propagating between two adjacent composite plies. [16,17,26,27] These two concepts deal with a crack propagating between two adjacent composite plies.…”

Section: Mechanical Testing To Determine Interlaminar Fracture Tougmentioning

confidence: 99%

“…[17,18] Even when delamination can occur in three different modes: opening mode (mode I), sliding mode (mode II), or tearing mode (mode III), mode I is the most common mode that occurs in composite structures, due to the lower energy which is required for crack initiation. It results from the separation of the interface between the layers of the composite laminate by the out-of-plane displacements, which may lead to a dramatic loss of strength and stiffness.…”

Section: Introductionmentioning

confidence: 99%

Mode I interlaminar fracture toughness of carbon‐epoxy coupons with embedded ceramic sensors

et al. 2017

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This study analyses the mechanical and crack growth behavior of woven carbon fiber reinforced plastics (CPRF) with embedded ceramic sensors. The material studied here is 3K-70-P carbon fiber plain weave with EPOLAM 2015® epoxy resin. The composite is manufactured with vacuum bagging procedure. Later on, the composite Mode I interlaminar fracture toughness (G IC ) is calculated by means of double cantilever beam tests (DCB) for two layout configurations [0/90] and [±45] with and without embedded sensors. Results give an initial approach of the fracture behavior of an instrumented composite facing an interlaminar crack. The interlaminar fracture toughness for the instrumented specimens is lower compared to the noninstrumented coupons. The presence of the sensor and its wire connection has a considerable impact on the damage tolerance of the woven composite, where the sensors surroundings seem to be the more likely region to be affected by an interlaminar fracture. K E Y W O R D S carbon fibers, delamination, fractography, fracture toughness F I G U R E 5 Load-displacement curve for [±45] double cantilever beam coupons [Colour figure can be viewed at wileyonlinelibrary.com] Reference With Peak load = 105 N, Peak load = 45 N, With How to cite this article: Torres M, Tellez RA, Hernández H, Camps T. Mode I interlaminar fracture toughness of carbon-epoxy coupons with embedded ceramic sensors.

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Dependance of stress ratio on the Mode I fatigue delamination growth in woven carbon–epoxy composites

et al. 2018

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This study analyzes crack growth behavior of woven carbon fiber reinforced plastics under tension–tension fatigue varying the stress ratio (R). The composite studied here is 3K‐70‐P carbon fiber plain weave with EPOLAM 2015® epoxy resin, manufactured by vacuum bagging procedure. The modified París’ law for composites is used to estimate the delamination crack growth (da/dN) in terms of interlaminar fracture toughness ratio (Gmax/GIC). Delamination's dependence on R factor is discussed, as crack growth rate increases when stress ratio becomes higher. Also, fractographic examination is provided, as fatigue striation density is inversely dependent on fatigue stress ratio.

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Interpreting the stress ratio effect on delamination growth in composite laminates using the concept of fatigue fracture toughness

Cited by 25 publications

References 18 publications

Stress ratio dependence of fibre bridging significance in mode I fatigue delamination growth of composite laminates

Stress ratio dependence of fibre bridging significance in mode I fatigue delamination growth of composite laminates

Mode I interlaminar fracture toughness of carbon‐epoxy coupons with embedded ceramic sensors

Dependance of stress ratio on the Mode I fatigue delamination growth in woven carbon–epoxy composites

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