Damage evolution behavior of CFRP laminates under post-impact fatigue with water absorption environment

Saitô, Hiroshi; Kimpara, Isao

doi:10.1016/j.compscitech.2008.03.025

Cited by 22 publications

(8 citation statements)

References 9 publications

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“…In general, similar mechanical performance effects were observed for CFRP composites exposed to water and salt water, whereas exposure to hydraulic oil produces notable differences [22,[27][28][29]. Exposing CFRP to water-based liquids causes the composite matrix to swell and plasticise, thereby reducing the interfacial adhesion between the matrix and fibre.…”

Section: Introductionmentioning

confidence: 60%

Effect of Combined Substance Sorption on the Mechanical Performance of Carbon Fibre-Reinforced Polymer Composites

Mostafa

Lavelle

Hadigheh

et al. 2021

Lecture Notes in Civil Engineering

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Carbon fibre-reinforced polymer (CFRP) composites are used extensively within the marine, oil and gas, aerospace, and automotive industries. In these applications, CFRP components are exposed to a wide range of corrosive substances, such as moisture, saltwater/seawater and industrial oil. As a result, CFRP components inevitably absorb undesirable substances throughout their service life, which subsequently leads to detrimental effects on their mechanical properties. The effects of individual interactions, as well as the sorption of various corrosive substances, is well documented in the literature. However, the combined effects of corrosive media interactions and induced damage to the mechanical performance of CFRP composites is not well known. Within this investigation, the effects of combined substance sorption on the mechanical properties of 2 × 2 twill weave carbon fibrereinforced epoxy, polyester, and vinyl ester composites were compared against the behaviour of individual substance constituents. Three common solutions that CFRP may be exposed to in service are utilised in the current investigation, namely, water, salt water, and industrial hydraulic oil. Gravimetric, tension and flexural tests were undertaken to understand the physical effect of the sorption phenomenon and to quantify the amount of deterioration in the mechanical performance of CFRP under hot and wet conditions. It was found that a combination of water and hydraulic oil, or salt water and hydraulic oil, degraded the CFRP specimens more than any individual solution. Moreover, it was observed that epoxy-based composites were more susceptible to deterioration than polyester-and vinyl ester-based composites. These results are important in developing design guidance for CFRP exposure in different media.

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Section: Introductionmentioning

confidence: 60%

Effect of Combined Substance Sorption on the Mechanical Performance of Carbon Fibre-Reinforced Polymer Composites

Mostafa

Lavelle

Hadigheh

et al. 2021

Lecture Notes in Civil Engineering

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“…Saito and Kimpara [114] researching multiaxial stiched CFRP (VARTM manufactured) concluded that the meeting of post-impact transverse cracks with cracks propagating during fatigue, gives rise to stress relaxation in the composite. Stress relaxation is particularly important when environmental factors such as water and temperature, influence CFRP during post-impact fatigue [115,116]. The impact damaged area allows water to ingress more effectively by creating open areas for water to wick along fibre-matrix interfaces, and moreover increases the area available for water diffusion.…”

Section: Effect Of Pre-existing Damage On the Fatigue Propertiesmentioning

confidence: 99%

“…The impact damaged area allows water to ingress more effectively by creating open areas for water to wick along fibre-matrix interfaces, and moreover increases the area available for water diffusion. In both cases, the impact area becomes more compliant and this coupled with stress relaxation through interconnecting cracks during fatigue, results in considerably reduced capacity for post-impact fatigue load-bearing, with larger variances between dry and wet reported in multi-axial (T700S-12K, VARTM) over plain-woven (T300B-3K, VARTM) composites [115].…”

Section: Effect Of Pre-existing Damage On the Fatigue Propertiesmentioning

confidence: 99%

The fatigue of carbon fibre reinforced plastics - A review

Alam

Mamalis

Robert

et al. 2019

Composites Part B: Engineering

275

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Engineering structures are often subjected to the conditions of cyclic-loading, which onsets material fatigue, detrimentally affecting the service-life and damage tolerance of components and joints. Carbon fibre reinforced plastics (CFRP) are high-strength, lowweight composites that are gaining ubiquity in place of metals and glass fibre reinforced plastics (GFRP) not only due to their outstanding strength-to-weight properties, but also because carbon fibres are relatively inert to environmental degradation and as such, show potential as corrosion resistant materials. The effects of cyclic loading on the fatigue of CFRP are detailed in several papers. As such, collating research on CFRP fatigue into a single document is a worthwhile exercise, as it will benefit the engineering-readership interested in designing fatigue resistant structures and components using CFRP. This review article aims to provide the most relevant and up-to-date information on the fatigue of CFRP. The review focuses in particular on defining fatigue and the mechanics of cyclically-loaded composites, elucidating the fatigue response and fatigue properties of CFRP in different forms, discussing the importance of environmental factors on the fatigue performance and service-life, and summarising the different approaches taken to modelling fatigue in CFRP.

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“…20,21 Consequently, these changes will have detrimental effects on the endurance limit and the fatigue life of the material. Several authors 22–27 have reported and validated the aforementioned hygrothermal effects on unidirectional, off-axis, and woven carbon fiber reinforced plastic (CFRP) composites from their studies at various temperature and moisture levels where coupons were subjected to static and fatigue tests. Reported hygrothermal effects included: (a) deterioration of fiber/matrix interface, due moisture absorption—especially at the fabrication stage, (b) enhanced damage accumulation rate in materials due to temperature, (c) reduced static strength (tensile and compressive) and fatigue life of the material due to temperature and humidity, (d) significant reduction of the fatigue resistance or performance during fatigue in T – C compared to fatigue in T – T , and (e) significant shrinking of anisomorphic constant fatigue life diagrams with the increase of temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of environmental conditions on the axial tension–compression fatigue behavior of carbon/epoxy plain-weave laminates containing flaws

Deluy

Khay

Ngô

et al. 2020

Journal of Composite Materials

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The objective of this work is to investigate the effects of environmental conditions on the axial fatigue behavior of a carbon/epoxy plain-weave laminate with an embedded flaw subjected to a partially reversed cyclic load (stress ratio R = −0.1) in tension–compression. This specific material is more commonly used in aerospace engineering for the manufacturing of aircraft structural parts, which are directly exposed to various environmental conditions during service. Specific environmental and loading conditions that are appropriate to simulate real-life conditions are considered to observe and collect information about the material's behavior. For the investigation, dry and wet coupons were submitted to room temperature, 82 and 121 ℃ under loading frequencies of 7 and 15 Hz. A maximum allowable strain increase criterion is used to monitor the flaw growth threshold or delamination onset, during fatigue testing. The ultrasonic imaging (C-scan) technique is used to verify and confirm the delamination onset. Results show that the delamination onset strain increase criterion, along with fatigue life, generally decreased as the operating temperature and humidity were increased and that frequency had little effect on the delamination onset fatigue life. The S– N curves obtained from the tension–compression fatigue data were then compared to those of a previous work carried out in tension–tension fatigue loading. Results show a clear degradation in the delamination onset fatigue life of the coupons tested under tension–tension cyclic loading when the minimum tensile component of the cyclic load was replaced with a compressive load of the same magnitude.

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Damage evolution behavior of CFRP laminates under post-impact fatigue with water absorption environment

Cited by 22 publications

References 9 publications

Effect of Combined Substance Sorption on the Mechanical Performance of Carbon Fibre-Reinforced Polymer Composites

Effect of Combined Substance Sorption on the Mechanical Performance of Carbon Fibre-Reinforced Polymer Composites

The fatigue of carbon fibre reinforced plastics - A review

Effects of environmental conditions on the axial tension–compression fatigue behavior of carbon/epoxy plain-weave laminates containing flaws

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