Analysis of hygrothermal effects on mixed mode I/II interlaminar fracture toughness of carbon composites joints

Sales, Rita de Cássia Mendonça; Sousa, A.F. de; Brito, Camila Belo Gomes; Sena, João; Silveira, Nubia Nale Alves da; Cândido, Geraldo Maurício; Donadon, Maurício Vicente

doi:10.1016/j.ijadhadh.2019.102477

Cited by 18 publications

(15 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydrogen and oxygen atoms from the water bonds with the oxygen and hydrogen atom in the nylon polymer chain. This hydrogen bonded water molecule acts as a plasticizer, allowing the polymer chain to slide along one another, 58 promoting stiffness decrease. 59 Kikuchi et al 24 have studied in more detailed the moisture effects on mechanical properties of the CFRTP.…”

Section: Fractographymentioning

confidence: 99%

Linear translaminar fracture characterization of additive manufactured continuous carbon fiber reinforced thermoplastic

Lamin

Bussamra

Ferreira

et al. 2021

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

This work presents the experimental determination of fracture mechanics parameters of composite specimens manufactured by fused filament fabrication (FFF) with continuous carbon fiber reinforced thermoplastic filaments, based on Linear Elastic Fracture Mechanics (LEFM). The critical mode I translaminar fracture toughness (KIc) and the critical energy release rate (GIc) are found for unidirectional and cross-ply laminates. The specimens were submitted to quasi-static tensile testing. Digital Image Correlation (DIC) is used to find the stress field. The stress fields around the crack tip are compared to linear elastic finite element simulations. The results demonstrate the magnitude of fracture toughness is in the same range as for polymers and some metals, depending on lay-up configuration. Besides, fractographic analyses show some typical features as river lines, fiber impression, fiber pulls-out and porosity aspects.

show abstract

Section: Fractographymentioning

confidence: 99%

Linear translaminar fracture characterization of additive manufactured continuous carbon fiber reinforced thermoplastic

Lamin

Bussamra

Ferreira

et al. 2021

Journal of Thermoplastic Composite Materials

View full text Add to dashboard Cite

show abstract

“…Deng et al 10 conducted a hygrothermal cyclical aging test at 80°C and 80% RH, and found that the shear strength of CFRP decreased by 24.3%, compressive strength decreased by 18.9%, and tensile strength decreased by 9.3%. In addition, Opelt et al 11 reported from a fracture perspective that the difference in the fracture propagation of specimens before and after hygrothermal conditioning was attributed to the plasticizing effect caused by moisture exposure, which reduced the stiffness of the polymer, decreased the compressive strength (approximately 8%), and significantly affected the delamination failure process of CFRP 1 . Recently, this conclusion was further confirmed microscopically through scanning electron microscopy (SEM) 6,12,13 .…”

Section: Introductionmentioning

confidence: 97%

Effect of temperature and moisture composite environments on the mechanical properties and mechanisms of woven carbon fiber composites

Chen,

Yang,

Xiao

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

Temperature and moisture are important environmental conditions governing the usage of carbon fiber‐reinforced plastics (CFRP). In this study, tensile, compression, and shear tests of woven CFRP composites were conducted in four composite environments: cold‐temperature dry state, room‐temperature dry state, elevated‐temperature dry state, and elevated‐temperature wet state. Fourier transform infrared (FTIR) spectroscopy was used to analyze the molecular composition and structure under these environments. The fracture morphology was also analyzed using scanning electron microscopy (SEM) to understand the deterioration mechanism of the material properties at the macro and micro scales. Finally, a two‐parameter Weibull statistical model was used to evaluate the scattering of the composites. The results demonstrate that the tensile, compressive, and shear properties of the material decrease under harsh conditions, and the degradation effect on the ultimate strength is much greater than that of the modulus. Cold‐temperature dry and elevated‐temperature wet conditions are particularly severe. Composite environments significantly affect the macroscopic failure process and ultimate failure mode of materials. In general, the temperature and humidity of the matrix system acts at the core of the deterioration mechanism of composites, affecting the properties of the fiber/matrix and orthogonal woven fiber interfaces, and eventually resulting in a loss of their constitutive strength and bearing capacity. The theoretical ultimate strength were consistent with the experimental values.Highlights Comprehensive mechanical property testing in multiple composite environments. Degradation mechanisms were revealed from multiscale morphology analysis. Scattering of composites were evaluated using statistical analyses. Cold temperature dry and elevated temperature wet were the worst states. Deterioration effect of environment on matrix and interface is the core failure mechanism.

show abstract

“…Another filler of epoxy-based polymers is the carbon (C) filler, especially as carbon fiber reinforced resin (CFRP) [31,32,[36][37][38][39]. Carbon as an additive to polymers (fillers) can be in various forms, such as, for example, carbon nanofillers and carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it seems advisable to undertake research in this direction. Sales et al [36] investigated the hygrothermal effects on fracture toughness of composite carbon/epoxy joints (80 • C and 90% RH). They underlined that wet and hot environments affect both the adherend and the adhesive.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Mechanical Properties of Epoxy Compounds Modified with Calcium Carbonate and Carbon after Hygrothermal Exposure

Rudawska

2020

Materials

View full text Add to dashboard Cite

The objective of this paper is to analyze the effects of hygrothermal exposure on the mechanical properties of epoxy compounds modified with calcium carbonate or carbon fillers. In addition, comparative tests were carried out with the same parameters as hygrothermal exposure, but the epoxy compounds were additionally exposed to thermal shocks. The analysis used cylindrical specimens produced from two different epoxy compounds. The specimens were fabricated from compounds of epoxy resins, based on Bisphenol A (one mixture modified, one unmodified) and a polyamide curing agent. Some of the epoxy compounds were modified with calcium carbonate (CaCO3). The remainder were modified with activated carbon (C). Each modifying agent, or filler, was added at a rate of 1 g, 2 g, or 3 g per 100 g of epoxy resin. The effect of the hygrothermal exposure (82 °C temperature and 95% RH humidity) was examined. The effects of thermal shocks, achieved by cycling between 82 °C and −40 °C, on selected mechanical properties of the filler-modified epoxy compounds were investigated. Strength tests were carried out on the cured epoxy compound specimens to determine the shear strength, compression modulus, and compressive strain. The analysis of the results led to the conclusion that the type of tested epoxy compounds and the quantity and type of filler determine the effects of climate chamber aging and thermal shock chamber processing on the compressive strength for the tested epoxy compounds. The different filler quantities, 1–3 g of calcium carbonate (CaCO3) or activated carbon (C), determined the strength parameters, with results varying from the reference compounds and the compounds exposure in the climate chamber and thermal shock chamber. The epoxy compounds which contained unmodified epoxy resin achieved a higher strength performance than the epoxy compounds made with modified epoxy resin. In most instances, the epoxy compounds modified with CaCO3 had a higher compressive strength than the epoxy compounds modified with C (activated carbon).

show abstract

Analysis of hygrothermal effects on mixed mode I/II interlaminar fracture toughness of carbon composites joints

Cited by 18 publications

References 20 publications

Linear translaminar fracture characterization of additive manufactured continuous carbon fiber reinforced thermoplastic

Linear translaminar fracture characterization of additive manufactured continuous carbon fiber reinforced thermoplastic

Effect of temperature and moisture composite environments on the mechanical properties and mechanisms of woven carbon fiber composites

Experimental Study of Mechanical Properties of Epoxy Compounds Modified with Calcium Carbonate and Carbon after Hygrothermal Exposure

Contact Info

Product

Resources

About