A reconsideration of the relationship between structural features and mechanical properties of carbon fibers

Li, Denghua; Lü, Chunxiang; Wang, Lina; Du, Shanyi; Yang, Yu

doi:10.1016/j.msea.2017.01.006

Cited by 23 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous research, it has been proven that dry‐jet gel spun carbon fibers could have a smooth surface or well aligned grooved surface depending on spinning conditions. For high performance carbon fibers (at least 5 GPa), the defect sizes are in the range of 10 ~ 40 nm based on Griffith equation 36,37 . Considering the grooves on wet spun carbon fibers have a width of 150 ~ 300 nm, the extra surface roughness caused by the formation of grooves would be the main issue limiting the performances of carbon fibers.…”

Section: Resultsmentioning

confidence: 99%

Polyacrylonitrile based carbon fibers: Spinning technology dependent precursor fiber structure and its successive transformation

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this study, the effects of different spinning methods including traditional wet and dry‐jet wet spinning, and newly developed dry‐jet gel spinning, on the structures and performances of polyacrylonitrile fibers, as well as the structural evolution during stabilization and carbonization, are compared in detail. The structural differences along radial direction, surface roughness, and chain orientation of carbon fibers are inherited from their precursor fibers, and these factors are determined by spinning technologies and processing conditions. Among all spinning methods, dry‐jet gel spinning could prepare fibers with the best chain orientation, the highest tensile properties, and the lowest surface roughness, which would be favorable for achieving higher mechanical performance. Additionally, for the resultant carbon fibers, the surface modification of dry‐jet gel spun carbon fibers is easier than dry‐jet wet spun carbon fibers, and comparable to wet spun carbon fibers. Overall, dry‐jet gel spinning is promising to make carbon fibers with both excellent tensile properties and good interfacial adhesion with epoxy matrix.

show abstract

Section: Resultsmentioning

confidence: 99%

Polyacrylonitrile based carbon fibers: Spinning technology dependent precursor fiber structure and its successive transformation

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…WGNs eventually form crystalline graphite above 1800 °C, which may form intergranular voids hence causing fracture (Figure 1d right). 13 A recent report described a crystal structure of a model of the chemical connection between two GNs via 5-and 7-membered rings (Figure 1d middle). 14 Single-molecule atomic-resolution time-resolved electron microscopy (SMART-EM) is a significant breakthrough in electron microscopy, 15 which allows us, with sufficient time and spatial resolution, to record the dynamics of molecular structures, to monitor chemical reactions and their rates as a function of temperature, to observe intermediates, and, when integrated with other methods, to deduce the reaction pathways of individual molecules.…”

Section: ■ Introductionmentioning

confidence: 99%

Wavy Graphene-Like Network Forming during Pyrolysis of Polyacrylonitrile into Carbon Fiber

et al. 2023

View full text Add to dashboard Cite

Carbon fiber (CF) obtained by pyrolysis of polyacrylonitrile (PAN-CF) surpasses metals in properties suitable for diverse applications such as aircraft manufacture and power turbine blades. PAN-CF obtained by pyrolysis at 1200− 1400 °C shows a remarkably high tensile strength of 7 GPa, much higher than pitch-based CF (pb-CF) consisting of piles of pure graphene networks. However, little information has been available on the atomistic structure of PAN-CF and on how it forms during pyrolysis. We pyrolyzed an acrylonitrile 9-mer in a carbon nanotube, monitored the course of the reaction using atomic-resolution electron microscopy and Raman spectroscopy, and found that this oligomer forms a thermally reactive wavy graphene-like network (WGN) at 1200−1400 °C during slow graphitization taking place between 900 and 1800 °C. Ptychographic microscopic analysis indicated that such material consists of 5-, 6-, and larger-membered rings; hence, it is not flat but wavy. The experimental data suggest that, during PAN-CF manufacturing, many layers of WGN hierarchically pile up to form a chemically and physically interdigitated noncrystalline phase that resists fracture and increases the tensile strength�the properties expected for high-entropy materials. pb-CF using nearly pure carbon starting material, on the other hand, forms a crystalline graphene network and is brittle.

show abstract

“…Characterized by lightweight as well as excellent mechanical properties compared to traditional metals, carbon fiber reinforced polymer (CFRP), composed of reinforcements and polymer matrix, has become the most important material in aerospace structures [ 1 , 2 ]. Recently, the commercial markets of CFRP are no longer confined to the aerospace industry but wider industrial sectors e.g., architecture and automobiles [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

A Multiscale Study of CFRP Based on Asymptotic Homogenization with Application to Mechanical Analysis of Composite Pressure Vessels

et al. 2022

View full text Add to dashboard Cite

The application of composites is increasingly extensive due to their advanced properties while the analysis still remains complex on different scales. In this article, carbon fiber reinforced polymer (CFRP) is modeled via asymptotic homogenization employing a representative volume element (RVE) with periodic boundary conditions. A multiscale mechanical model of CFRP is established to bridge the microscopic model, mesoscopic model, and macroscopic model. According to asymptotic homogenization, the coefficients of the material constitutive equation are calculated with volume-averaged stress and strain. Using the homogenized materials properties of CFRP, the tensile experiments of composite layers with the layout of [(0∘/60∘/0∘/−60∘)4] are carried out to validate asymptotic homogenization method. The results indicated that the asymptotic homogenization approach can be used to calculate the homogenized elastic moduli and Poisson’s ratio of the whole structure, where the numerical results are basically consistent with test data. The sequent homogenized CFRP laminate model is applied to the mechanical analysis of type III composite pressure vessels, whereby burst pressure is accurately predicted. This work might shed some light on multiscale analysis of composite pressure vessels.

show abstract

A reconsideration of the relationship between structural features and mechanical properties of carbon fibers

Cited by 23 publications

References 29 publications

Polyacrylonitrile based carbon fibers: Spinning technology dependent precursor fiber structure and its successive transformation

Polyacrylonitrile based carbon fibers: Spinning technology dependent precursor fiber structure and its successive transformation

Wavy Graphene-Like Network Forming during Pyrolysis of Polyacrylonitrile into Carbon Fiber

A Multiscale Study of CFRP Based on Asymptotic Homogenization with Application to Mechanical Analysis of Composite Pressure Vessels

Contact Info

Product

Resources

About