Effect of Interlaminated Carbon and Basalt Fiber Reinforced Hybrid Composites on Mode I Fracture Toughness

Although fiber-reinforced polymers (FRP) have until now been largely applied to various fields of engineering, these materials have also been used in many technical applications, especially where high strength and stiffness are required, but with low component weight. Among various natural fibers, banana fiber is of particular interest in that its composites have high tensile strength, high tensile modulus, and low elongation at break beside its low cost and eases of availability. In this study, banana fiber and glass fiber reinforced polyester Resin composites were prepared using hand lay up technique . Experiments are conducted to compare and to find the effect of fiber volume fraction on mode I fracture toughness of both composites.

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Identification of the effect of nanofiller morphology on interlaminar fracture toughness of hybrid composites

Journal of Composite Materials ◽

10.1177/00219983211002915 ◽

2021 ◽

pp. 002199832110029

Author(s):

Jamshid Kavosi ◽

Sevketcan Sarikaya ◽

Terry S Creasy ◽

Mohammad Naraghi

Keyword(s):

Fracture Toughness ◽

Hybrid Composites ◽

Mode I ◽

Fiber Reinforced ◽

Fiber Reinforced Composite ◽

Mode I Fracture Toughness ◽

Reinforced Composite ◽

Novel Approach ◽

Matrix Interactions ◽

Initiation Fracture Toughness

Nanoscale reinforcements have the potential to improve mechanical properties of fiber reinforced composite. Here, effect of nanofiller morphology and dispersion in augmenting mode I fracture toughness of unidirectional carbon fiber reinforced composite materials is studied. The nanofillers used is electrospun carbon nanofibers (CNFs). Unlike most nanofillers which are in particulate form, CNFs exist in both continuous nanofiber mat and particulate forms. This trait allowed us to compare the effect of particulate nanofillers (CNFs dispersed in B-staged epoxy) vs. dry mats on fracture toughness of composites while all other parameters are kept constant. To enhance CNFs-matrix interactions, a novel approach was utilized to functionalize CNFs surface with melamine, so that epoxy functional groups can form strong bonds to matrix. The improvement in mode I initiation fracture toughness with CNF mats was statistically significant, while in B-staged samples, statistical analysis revealed insignificant improvement. In addition, in both CNFs reinforced samples, crack propagation fracture toughness decreased with crack growth and approached that of the composites with no CNFs. The decline was steeper in samples with B-staged CNFs. This behavior was explained by evaluating fracture path via SEM imaging. It was concluded that while CNFs bridge crack tip initially and delay crack initiation, crack deflects towards a lower resistance path by tearing CNFs mat and propagating along resin-rich interface between CNFs and microfibers. These alternative and weaker fracture planes are more readily available in B-staged samples due to poor integration of the B-staged epoxy with the rest of the composite.

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Mode I Fracture Toughness of Fiber Reinforced Composite-Wood Bonded Interface

Journal of Composite Materials ◽

10.1177/002199839803201005 ◽

1998 ◽

Vol 32 (10) ◽

pp. 987-1013 ◽

Cited By ~ 21

Author(s):

Julio F. Davalos ◽

Pizhong Qiao ◽

Prabhu Madabhusi-Raman ◽

Elemer M. Lang

Keyword(s):

Fracture Toughness ◽

Mode I ◽

Fiber Reinforced ◽

Fiber Reinforced Composite ◽

Mode I Fracture ◽

Mode I Fracture Toughness ◽

Reinforced Composite ◽

Bonded Interface ◽

Composite Wood

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Mode I fracture toughness of fiber-reinforced polymer composites: A review

Journal of Industrial Textiles ◽

10.1177/1528083719858767 ◽

2019 ◽

pp. 152808371985876 ◽

Cited By ~ 3

Author(s):

Amna Siddique ◽

Sharjeel Abid ◽

Faizan Shafiq ◽

Yasir Nawab ◽

Hailou Wang ◽

...

Keyword(s):

Fracture Toughness ◽

Limiting Factor ◽

Mode I ◽

Fiber Reinforced ◽

Mode I Fracture ◽

Mode I Fracture Toughness ◽

Fiber Reinforced Polymer Composites ◽

Recent Developments ◽

Improve Fracture Toughness ◽

Toughness Testing

Composite materials are known for their high stiffness and strength at lower weight as compared to conventional structural materials. Recently, there has been a growing interest in finding the new ways to decrease delamination failure, which is a life limiting factor of laminated composites. This review paper emphasizes on the effects of different reinforcement structures on mode I fracture toughness and possible ways to improve fracture toughness. A brief description on intrinsic and extrinsic mechanisms of crack growth has been discussed along with the earlier investigations and recent developments for mode I fracture toughness testing. Factors that affect the fracture toughness are also discussed. A brief knowledge of mode I fracture toughness of traditional and advanced fiber-reinforced composites is given, which could help researchers to understand fracture behaviors of composites and thus, it can help engineers to design composites with higher interlaminar strength.

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Effect of fiber content and fiber orientation on mechanical behavior of fused filament fabricated continuous-glass-fiber-reinforced nylon

Rapid Prototyping Journal ◽

10.1108/rpj-01-2021-0003 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Stephanie S. Luke ◽

David Soares ◽

Janaye V. Marshall ◽

James Sheddden ◽

Özgür Keleş

Keyword(s):

Fracture Toughness ◽

Fiber Orientation ◽

Fiber Content ◽

Mode I ◽

Fiber Reinforced ◽

Content Type ◽

Mode I Fracture ◽

Mode I Fracture Toughness ◽

Continuous Glass Fiber ◽

Glass Fiber Reinforced

Purpose Fused filament fabrication of continuous-fiber-reinforced polymers is a promising technique to achieve customized high-performance composites. However, the off-axis tensile strength (TS) and Mode I fracture toughness of fused filament fabricated (FFFed) continuous-glass-fiber-reinforced (CGFR) nylon are unknown. The purpose of this paper is to investigate the mechanical and fracture behavior of FFFed CGFR nylon with various fiber content and off-axis fiber alignment. Design/methodology/approach Tensile tests were performed on FFFed CGFR-nylon with 9.5, 18.9 and 28.4 fiber vol. %. TS was tested with fiber orientations between 0∘ and 90∘ at 15∘ intervals. Double cantilever beam tests were performed to reveal the Mode I fracture toughness of FFFed composites. Findings TS increased with increasing fiber vol. % from 122 MPa at 9.5 vol. % to 291 MPa at 28 vol. %. FFFed nylon with a triangular infill resulted in 37 vol. % porosity and a TS of 12 MPa. Composite samples had 11–12 vol. % porosity. TS decreased by 78% from 291 MPa to 64 MPa for a change in fiber angle θ from 0∘ (parallel to the tensile stress) to 15∘. TS was between 27 and 17 MPa for 300 < θ < 900. Mode I fracture toughness of all the composites were lower than ∼332 J/m2. Practical implications Practical applications of FFFed continuous-fiber-reinforced (CFR) nylon should be limited to designs where tensile stresses align within 15∘ of the fiber orientation. Interlayer fracture toughness of FFFed CFR composites should be confirmed for product designs that operate under Mode I loading. Originality/value To the best of the authors’ knowledge, this is the first study showing the effects of fiber orientation on the mechanical behavior and effects of the fiber content on the Mode I fracture toughness of FFFed CGFR nylon.

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