Fracture Surface and Mechanical Properties of Epoxy Composites

Naderi, Mehdi; Ebrahimi, Farnaz

doi:10.1002/9783527824083.ch10

Cited by 5 publications

(4 citation statements)

References 79 publications

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“…This was consistent with the findings of the tensile test. The composite’s strength was increased as a result of the bridging effect [ 16 ] at the interface of the PA6 nanofiber mat and epoxy layer, which increased the crosslink intensity and dissolution bonds [ 65 , 66 ].…”

Section: Resultsmentioning

confidence: 99%

The Mechanical Properties of Nanocomposites Reinforced with PA6 Electrospun Nanofibers

et al. 2023

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Electrospun nanofibers are very popular in polymer nanocomposites because they have a high aspect ratio, a large surface area, and good mechanical properties, which gives them a broad range of uses. The application of nonwoven structures of electrospun nanofiber mats has historically been limited to enhancing the interlaminar responses of fiber-reinforced composites. However, the potential of oriented nanofibers to improve the characteristics of bulk matrices cannot be overstated. In this research, a multilayered laminate composite was created by introducing polyamide (PA6)-oriented nanofibers into an epoxy matrix in order to examine the effect of the nanofibers on the tensile and thermal characteristics of the nanocomposite. The specimens’ fracture surfaces were examined using scanning electron microscopy (SEM). Using differential scanning calorimetry (DSC) analysis, the thermal characteristics of the nanofiber-layered composites were investigated. The results demonstrated a 10.58% peak in the nanocomposites’ elastic modulus, which was compared to the numerical simulation and the analytical model. This work proposes a technique for the development of lightweight high-performance nanocomposites.

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Section: Resultsmentioning

confidence: 99%

The Mechanical Properties of Nanocomposites Reinforced with PA6 Electrospun Nanofibers

et al. 2023

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“…However, the elongation of the 10 wt% filled nanocomposite was still in the higher range, as compared to that of the typical epoxy resins. 23,66 Moreover, it has been observed that the yield stress and Young's modulus of the f -GO-BN filled nanocomposite were higher as compared to those of the individual GO or BN filled nanocomposites at similar filler loading (5 wt%) (Fig. 7b and S8a†).…”

Section: Resultsmentioning

confidence: 93%

“…22 Although pristine epoxies offer higher strength and adhesion in comparison to TPU, they are typically brittle in nature. 23 In contrast, TPU-epoxy S-IPN coating could manifest better stretchability, which is also crucial. However, studies on the gas barrier properties of the TPU-epoxy S-IPN are scarce, and the characteristics of this particular S-IPN are highly desirable for H 2 gas barrier coating applications.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of impermeable dense architecture containing covalently stitched graphene oxide/boron nitride hybrid nanofiller reinforced semi-interpenetrating network for hydrogen gas barrier applications

et al. 2022

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“…Before analyzing the fracture micrographs, it is important to define two different types of morphologies, i.e., brittle-like and ductile-like. As discussed by Naderi and Ebrahimi [33], brittle-like morphologies can be defined as large cleavage and smooth formations. According to Korayem et al [34], a ductile-like fracture can be defined as an agglomeration of small fractures.…”

Section: Resultsmentioning

confidence: 97%

Nano-Modified Epoxy Based Adhesive Testings: An Investigation into Apparent Shear Strength, Failure Modes, Chemical Functionals, and Microstructural Failure

Reis

Paixão

Monteiro

et al. 2023

Engineering Science & Technology

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Single lap joints are the most used bonded joints in engineering. Unfortunately, modeling correlations between apparent shear strength and failure modes is not an easy task. This paper tries to address relationships between apparent shear strength, failure modes, and micro-structural failures. To be able to establish a correlation between chemical changes and the failure morphology of an industrial epoxy-based adhesive nano-modified by carbon nanotubes, a series of single-lap joints were prepared and tested. For this adhesive, the ductile-like fracture is controlled by changes in the aromatic ring (C-O stretching at 1,176 cm-1, C-C stretching at 1,514 cm-1, and C = C stretching at 1,593 cm-1) and ethers group (C-O-C stretching at 1,247 cm-1). Changes in the ethers group, however, have less influence than the ones in aromatic rings. Variations in oxirane groups (C-O-C stretching at 836 cm-1, and rotations of CH2 at 695 and 756 cm-1) are more related to brittle-like microscopic failure. A small number of chemical bonds, specifically characterized by low chemical functional intensity, are associated with premature or brittle-like failure. However, concurrently, another mechanism that existed simultaneously was the ability of carbon nanotubes to alter the path of propagating cracks. This phenomenon was experimentally spotted. The macroscopic cohesive failure is controlled by the ductile-like failure at microscopic failure, while the adhesive failure is related to the brittle-like failure. Moreover, for the first time two different conditions, i.e., macroscopic quantities, apparent shear strength, failure modes, and microscopic quantities of brittle/ductile areas aspect ratios are combined in a mathematical model. This model can predict single-lap joint failure strength based on microscopic quantities.

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Fracture Surface and Mechanical Properties of Epoxy Composites

Cited by 5 publications

References 79 publications

The Mechanical Properties of Nanocomposites Reinforced with PA6 Electrospun Nanofibers

The Mechanical Properties of Nanocomposites Reinforced with PA6 Electrospun Nanofibers

Fabrication of impermeable dense architecture containing covalently stitched graphene oxide/boron nitride hybrid nanofiller reinforced semi-interpenetrating network for hydrogen gas barrier applications

Nano-Modified Epoxy Based Adhesive Testings: An Investigation into Apparent Shear Strength, Failure Modes, Chemical Functionals, and Microstructural Failure

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