Effects of hygrothermal aging and fiber orientations on constant amplitude fatigue properties of CFRP multidirectional composite laminates

Behera, Alok; Dupare, Prasanna; Thawre, Manjusha M.; Ballal, Atul

doi:10.1016/j.ijfatigue.2020.105590

Cited by 40 publications

(21 citation statements)

References 47 publications

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“…Possible other mechanisms include transport through microcracks, capillary action at the interface of the fiber, and fiber/matrix boundary. 26,27 Moisture in composite has unfavorable effects as it often causes swelling and degradation. 28 Absorbed moisture in composite materials leads to polymer matrix pasticization and reduction in fiber/matrix interfacial strength.…”

Section: Mechanical Testsmentioning

confidence: 99%

Effect of hygrothermal aging on the mechanical properties of IMA/M21E aircraft-grade CFRP composite

Shetty

Bojja

Srihari

2020

Advanced Composites Letters

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Unidirectional carbon fiber-reinforced plastic (CFRP) IMA/M21E polymer composite was manufactured by standard autoclave curing method. This is a new aircraft-grade CFRP composite presently used in the manufacture of aircraft wing parts. Test specimens as per ASTM standards for weight gain, tensile and compression tests were obtained from this composite laminates. Some of the test specimens were subjected to hygrothermal (hot–wet) aging in an environmental chamber under three different conditions, that is, (i) 45°C/85% relative humidity (RH), (ii) 70°C/85% RH and (iii) 55°C/100% RH until reaching moisture absorption saturation. Matrix-dominated mechanical properties, that is, transverse tensile and longitudinal compression were determined for dry and hygrothermally aged test specimens. During mechanical testing in a servo-hydraulic test machine, the respective hygrothermal conditions were maintained while testing. It was noted that the rate of moisture absorption increases progressively and reaches saturation around 0.76–1.24 wt% depending on the aging conditions. Moisture absorption followed Fickian diffusion behavior in all the conditions of the study. Also, a software program was developed to predict the moisture content and time of saturation. The predicted results from this software program correlated with experimental results. It was observed that the presence of moisture reduced the tensile strength significantly by about 9–31% and compression strength by about 2–8%. Microscopic observation of tested samples was carried out using scanning electron microscope to study the failure behavior.

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Section: Mechanical Testsmentioning

confidence: 99%

Effect of hygrothermal aging on the mechanical properties of IMA/M21E aircraft-grade CFRP composite

Shetty

Bojja

Srihari

2020

Advanced Composites Letters

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“…CFRP also offers favorable application-based advantages like the excellent corrosion resistance, ease of manufacturing complex geometry and lower magnetic properties. [1][2][3][4] The tendency of the polymer to absorb moisture is one of the few drawbacks of this type of materials. The absorbed moisture affects the material strength, stiffness and its thermo-mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

Moisture absorption characterization of carbon fiber‐reinforced polymer using Fickian and non‐Fickian models

Xing

2022

Polymer Composites

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Three classic moisture absorption models including the Fickian model, the Langmuir and the time‐variable diffusion model were adopted to describe the absorption behavior of carbon fiber‐reinforced polymer (CFRP) laminates in this work. A new non‐Fickian model based on the two‐phase absorption rule was proposed by introducing the equivalent absorption time into the Langmuir model. Experiments of accelerated moisture absorption were conducted for CFRP laminates with different lay‐ups under three temperatures. Moisture uptaking performance of the CFRP laminates was discussed. Preliminary data analysis of the moisture absorption content showed the existence of non‐Fickian diffusion behavior. Four numerical models were implemented into Matlab by combining the Gauss‐Newton algorithm with minimum mean square error. Effects of the environment temperature and the lay‐ups of the laminates on the diffusion process of water molecules in CFRP. The results demonstrated that the modified time‐variable Langmuir model shows the best fitting performance. The diffusion coefficient and equilibrium moisture uptake increased with the environment temperature. Water diffusion coefficients in monotonous ply‐structure is larger than that in multi‐angle plys.

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“…In carbon fiber reinforced polymer (CFRP) composites, while the carbon fiber provides strength and stiffness, the polymer matrix is responsible for effective load transfer, providing protection, and holding the fiber together. [1][2][3] However, various environmental conditions such as temperature, 4,5 thermal spikes, 6 thermal aging, 7,8 hydrothermal aging, [9][10][11] hygrothermal aging, 12,13 thermal shock 14,15 and UV-rays 16,17 can have decremental effects on the properties of CFRP composites. 18 The CFRP laminated composite with a bi-directional carbon fiber mat has exceptional mechanical properties in the in-plane direction but lacks in the out-of-plane performance.…”

Section: Introductionmentioning

confidence: 99%

Synergetic impact of both fiber surface grafting and matrix modification by carbon nanotubes and functionalized carbon nanotubes on the flexural behavior of carbon fiber reinforced polymer composites: An assessment at cryo‐, room‐, and elevated‐ in situ temperature conditions

Yadav

Nayak

Fulmali

et al. 2022

J of Applied Polymer Sci

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In this article, the carbon fiber reinforced vinyl ester (CVE) composite was modified with pristine and functionalized carbon nanotubes (CNTs/FCNTs) using the in situ polymerization and electrophoretic deposition (EPD) techniques: individually and using both simultaneously. Their influence on the flexural properties of the composites at room (RT), cryogenic (−196°C) (CT), and elevated (70°C) (ET) temperatures were compared. Through matrix modification, the best flexural strength with CNT and FCNT modified composites was found to be 6.2% and 9.9% higher over neat CVE composite. Similarly, following the EPD technique, the optimum flexural strength enhancement with CNT and FCNT was recorded to be 10.3% and 13.8% with respect to the control composite respectively. A synergetic impact could be noticed by combining both the techniques together, where the flexural strength of the hierarchical composite with FCNT modification was improved by ~22%, ~25%, and ~ 6% higher than that of control CVE at RT, CT and ET respectively. The dispersion quality of nanotubes in the matrix and on the carbon fiber surface, and fractured surface morphology is analyzed using a SEM.

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Effects of hygrothermal aging and fiber orientations on constant amplitude fatigue properties of CFRP multidirectional composite laminates

Cited by 40 publications

References 47 publications

Effect of hygrothermal aging on the mechanical properties of IMA/M21E aircraft-grade CFRP composite

Effect of hygrothermal aging on the mechanical properties of IMA/M21E aircraft-grade CFRP composite

Moisture absorption characterization of carbon fiber‐reinforced polymer using Fickian and non‐Fickian models

Synergetic impact of both fiber surface grafting and matrix modification by carbon nanotubes and functionalized carbon nanotubes on the flexural behavior of carbon fiber reinforced polymer composites: An assessment at cryo‐, room‐, and elevated‐ in situ temperature conditions

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