Evaluation of strength degradation behavior and fatigue life prediction of plain-woven carbon-fiber-reinforced plastic laminates immersed in seawater

Koshima, Shuhei; Yoneda, Shunsuke; Kajii, Norihiro; Hosoi, Atsushi; Kawada, Hiroyuki

doi:10.1016/j.compositesa.2019.105645

Cited by 20 publications

(7 citation statements)

References 54 publications

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“…The model parameters are determined by common fitting procedures, resulting in extensive and costly experimental testing. Figure 17 shows constant life diagrams for plain-woven CFRP aged in seawater for different times [ 167 ]. These were calculated based on the fatigue life prediction model using Basquin’s law and strength degradation model of Epaarachchi and Clausen.…”

Section: Models For Predicting Materials Durability and Service Lifetimementioning

confidence: 99%

“…Although these approaches can contribute to understanding the damage mechanisms under the environmental impact, these are characterised by limited versatility since all the fitting parameters are specific for a given material only. Modelling of fatigue properties by this methodology has been used by Tang et al [ 151 ], Khan [ 152 ], Cormier et al [ 136 ], Mivehchi et al [ 149 ], Koshima et al [ 167 ], Eftekhari and Fatemi [ 78 ], Amjadi and Fatemi [ 166 ], Prabhakar et al [ 145 ], Solfiti et al [ 168 ], and Acosta et al [ 169 ]. The results are summarised in Table 2 regarding the environmental factors, material and testing parameters, and general concepts employed in modelling.…”

Section: Models For Predicting Materials Durability and Service Lifetimementioning

confidence: 99%

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Modelling of Environmental Ageing of Polymers and Polymer Composites—Durability Prediction Methods

et al. 2022

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Polymers and polymer composites are negatively impacted by environmental ageing, reducing their service lifetimes. The uncertainty of the material interaction with the environment compromises their superior strength and stiffness. Validation of new composite materials and structures often involves lengthy and expensive testing programs. Therefore, modelling is an affordable alternative that can partly replace extensive testing and thus reduce validation costs. Durability prediction models are often subject to conflicting requirements of versatility and minimum experimental efforts required for their validation. Based on physical observations of composite macroproperties, engineering and phenomenological models provide manageable representations of complex mechanistic models. This review offers a systematised overview of the state-of-the-art models and accelerated testing methodologies for predicting the long-term mechanical performance of polymers and polymer composites. Accelerated testing methods for predicting static, creep, and fatig ue lifetime of various polymers and polymer composites under environmental factors’ single or coupled influence are overviewed. Service lifetimes are predicted by means of degradation rate models, superposition principles, and parametrisation techniques. This review is a continuation of the authors’ work on modelling environmental ageing of polymer composites: the first part of the review covered multiscale and modular modelling methods of environmental degradation. The present work is focused on modelling engineering mechanical properties.

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Section: Models For Predicting Materials Durability and Service Lifetimementioning

confidence: 99%

Section: Models For Predicting Materials Durability and Service Lifetimementioning

confidence: 99%

Modelling of Environmental Ageing of Polymers and Polymer Composites—Durability Prediction Methods

et al. 2022

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“…During service in different environments, the material strength degrades with time or loading times. 19 Laser metal deposition (LMD) is one of additive manufacturing (AM). The metal powders are delivered into laser spot by shielding gas stream and then melted to form molten pool.…”

Section: Introductionmentioning

confidence: 99%

Investigation on fatigue life prediction and reliability design of 304 stainless steel manufactured by laser metal deposition

Huang

Zhang

2022

Proceedings of the Institution of Mechanical Engineers, Part O:

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Laser metal deposition (LMD) is an advanced technology to manufacture the specimen by layer-by-layer method. In this paper, the fatigue tests of 304 stainless steel (SS304) smooth specimens manufactured by LMD are conducted with the stress ratio of −1 and the frequency of 10 Hz. Considering that the fatigue crack is caused by the material defect on the subsurface, the fatigue life of smooth specimen under the different cyclic stress amplitudes are predicted based on the dislocation model, equivalent initial crack size and empirical formula. Lognormal, two-parameter Weibull and extreme maximum value distributions are applied to describe the fatigue life of the smooth specimens at the different cyclic stress amplitudes. The result shows that two-parameter Weibull distribution has the best ability to describe the fatigue life distribution. Based on two-parameter Weibull distribution, the probabilistic-stress-number ( P- S-N) curves at the four different reliability levels are plotted. Combined with the material strength degradation rule, the design checkpoint method is adopted to analyze the fatigue life reliability of smooth specimens under the different cyclic stress amplitudes. The reliability results are close to those of two-parameter Weibull distribution.

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“…They observed a significant effect on the variation of the mechanical properties of the material. Koshima et al [22] analysed the response of CFRP laminates immersed in seawater and observed that fatigue durability is strongly affected by the stress ratio and the deterioration of the fibre/matrix interface strength. According to Weitsman and Elhia [23], the coupling between mechanically induced microcracks in the composite and the suction of water into the capillary channels has an important role in the fatigue life of the component.…”

Section: Introductionmentioning

confidence: 99%

Seawater Effect on Fatigue Behaviour of Notched Carbon/Epoxy Laminates

et al. 2021

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This paper studies the effect of seawater immersion on the fatigue behavior of notched carbon/epoxy laminates. Rectangular cross-section specimens with a central hole were immersed in natural and artificial seawater for different immersion times (0, 30 and 60 days), being the water absorption rate evaluated over time. After that, fatigue tests were performed under uniaxial cyclic loading using a stress ratio equal to 0.1. After the tests, the optical microscopy technique allowed the examination of the failure micro-mechanisms at the fracture surfaces. The results showed that saturation appeared before 30 days of immersion and that water absorption rates were similar for natural and artificial seawater. The S–N curves showed that the seawater immersion affects the fatigue strength, but there were no relevant effects associated with the type of seawater. Moreover, it was also clear that fatigue life was similar for long lives, close to 1 million cycles, regardless of the immersion time or the type of seawater. On the contrary, for short lives, near 10 thousand cycles, the stress amplitude of dry laminates was 1.2 higher than those immersed in seawater. The failure mechanisms were similar for all conditions, evidencing the fracture of axially aligned fibres and longitudinal delamination between layers.

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Evaluation of strength degradation behavior and fatigue life prediction of plain-woven carbon-fiber-reinforced plastic laminates immersed in seawater

Cited by 20 publications

References 54 publications

Modelling of Environmental Ageing of Polymers and Polymer Composites—Durability Prediction Methods

Modelling of Environmental Ageing of Polymers and Polymer Composites—Durability Prediction Methods

Investigation on fatigue life prediction and reliability design of 304 stainless steel manufactured by laser metal deposition

Seawater Effect on Fatigue Behaviour of Notched Carbon/Epoxy Laminates

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