Mechanical properties and fracture toughness of fumed silica epoxy composites containing glycidyl terminated polysiloxanes

Bok, Goseong; Lim, Gayoung; Park, KeumHwan; Kim, Young‐Min

doi:10.1016/j.ceramint.2021.05.300

Cited by 15 publications

(4 citation statements)

References 35 publications

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“…In [ 34 ], the field emission scanning electron microscope images confirmed that nanocomposites with organo-modified MMT loading beyond 1 wt% exhibit large tactoid particles and agglomeration. In addition to diminishing the improvement of mechanical properties for composite materials, this also leads to an increased viscosity and difficulties in production [ 35 , 36 ]. The modification of the surface of the nanomaterials by a large number of active groups is capable of improving the compatibility between nanomaterials and epoxy adhesives.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Mechanical and Bond Properties of Epoxy Adhesives Modified by SiO2 Nanoparticles with Active Groups

Long

2022

Polymers

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In order to improve the mechanical and bond properties of epoxy adhesives for their wide scope of applications, modified epoxy adhesives were produced in this study with SiO2 nanoparticles of 20 nm in size, including inactive groups, NH2 active groups, and C4H8 active groups. The mechanical properties of specimens were examined, and an investigation was conducted into the effects of epoxy adhesive modified by three kinds of SiO2 nanoparticles on the bond properties of carbon fiber reinforced polymer and steel (CFRP/steel) double lap joints. According to scanning electron microscopy (SEM), the distribution effect in epoxy adhesive of SiO2 nanoparticles modified by active groups was better than that of inactive groups. When the mass fraction of SiO2-C4H8 nanoparticles was 0.05%, the tensile strength, tensile modulus, elongation at break, bending strength, flexural modulus, and impact strength of the epoxy adhesives reached their maximum, which were 47.63%, 44.81%, 57.31%, 62.17%, 33.72%, 78.89%, and 68.86% higher than that of the EP, respectively, and 8.45%, 9.52%, 9.24%, 20.22%, 17.76%, 20.18%, and 12.65% higher than that of the inactive groups of SiO2 nanoparticles, respectively. The SiO2 nanoparticles modified with NH2 or C4H8 active groups were effective in improving the ultimate load-bearing capacity and bond properties of epoxy adhesives glued to CFRP/steel double lap joints, thus increasing the strain and interface shear stress peak value of the CFRP surface.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Mechanical and Bond Properties of Epoxy Adhesives Modified by SiO2 Nanoparticles with Active Groups

Long

2022

Polymers

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“…The fracture toughness K and energy release rate G of the SENB tests are calculated as follows [ 32 ]:

where P Q is the peak force.

…”

Section: Tensile and Compressive Fracture Toughness Testsmentioning

confidence: 99%

Experimental Study on the Fracture Toughness of Bamboo Scrimber

Zhang

Hou

et al. 2023

Materials

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In the past decade, bamboo scrimber has developed rapidly in the field of building materials due to its excellent mechanical properties, such as high toughness and high tensile strength. However, when the applied stress exceeds the ultimate strength limit of bamboo scrimber, cracks occur, which affects the performance of bamboo scrimber in structural applications. Due to the propensity of cracks to propagate, it reduces the load-bearing capacity of the bamboo scrimber material. Therefore, research on the fracture toughness of bamboo scrimber contributes to determining the material’s load-bearing capacity and failure mechanisms, enabling its widespread application in engineering failure analysis. The fracture toughness of bamboo scrimber was studied via the single-edge notched beam (SENB) experiment and compact compression (CC) method. Nine groups of longitudinal and transverse samples were selected for experimental investigation. The fracture toughness of longitudinal bamboo scrimber under tensile and compressive loadings was 3.59 MPa·m1/2 and 2.39 MPa·m1/2, respectively. In addition, the fracture toughness of transverse bamboo scrimber under tensile and compressive conditions was 0.38 MPa·m1/2 and 1.79 MPa·m1/2, respectively. The results show that, for this material, there was a significant distinction between longitudinal and transverse. Subsequently, three-point bending tests and simulations were studied. The results show that the failure mode and the force–displacement curve of the numerical simulation were highly consistent compared with the experimental results. It could verify the correctness of the test parameters. Finally, the flexural strength of bamboo scrimber was calculated to be as high as 143.16 MPa. This paper provides data accumulation for the numerical simulation of bamboo scrimber, which can further promote the development of bamboo scrimber parameters in all aspects of the application.

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“…However, properties such as fracture toughness and high temperature properties still needs to be improved to enable its usage in other applications. As such, various fillers including silica [1,2], graphene [3,4], and Carbon Nanotube (CNT) [5,6] are often added to epoxy matrices, which often resulted in a S E3S Web of Conferences 477, 00041 (2024) https://doi.org/10.1051/e3sconf/202447700041 STAR'2023 significant improvement in the mechanical properties of the epoxy. The effects of utilizing carbonaceous fillers in enhancing mechanical properties generally and fracture toughness specifically have been reported previously.…”

Section: Introductionmentioning

confidence: 99%

Enhanced mechanical properties of multi-scaled carbon reinforcements in ternary epoxy composites materials

Othman,

Ahmad,

Faizal

et al. 2024

E3S Web Conf.

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Carbon nanotubes (CNT) and graphene have widely used as reinforcements in epoxy for various aims and applications since their ‘discovery’. For example, in the area of aviation and aerospace materials, carbon reinforcements are desirable as they offer solutions for light weight yet mechanically enhanced materials. The objective of this work is to investigate the effects of adding combination of carbon fillers of different aspect ratios on the thermal mechanical, Young’s Modulus and Fracture Toughness properties of the resultant epoxy composites. The carbon fillers include carbon nanotubes (CNT), graphene, and carbon black (CB) and their combined loading will be varied from 0.5 wt. % until 7 wt. % to form sets of binary epoxy composites and a ternary epoxy composites. All of the fillers are kept at the 1:1 weight ratio for CB + CNT, CB + Graphene, CNT + Graphene, and CB + CNT + Graphene. Among these combinations, the system with ternary fillers at 7 wt.% demonstrated the highest value of glass transition temperature (Tg) and KIC, and Young’s Modulus. The percent improvement for glass transition temperature (Tg) and KIC, and Young’s Modulus compared to neat epoxy are 9.5 %, 571%, and 58.3%, respectively. This work clearly demonstrated the effectiveness of employing various carbon fillers with different aspect ratio and morphology in enhancing the values of mechanical properties of epoxy system.

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Mechanical properties and fracture toughness of fumed silica epoxy composites containing glycidyl terminated polysiloxanes

Cited by 15 publications

References 35 publications

Enhancement of Mechanical and Bond Properties of Epoxy Adhesives Modified by SiO2 Nanoparticles with Active Groups

Enhancement of Mechanical and Bond Properties of Epoxy Adhesives Modified by SiO2 Nanoparticles with Active Groups

Experimental Study on the Fracture Toughness of Bamboo Scrimber

Enhanced mechanical properties of multi-scaled carbon reinforcements in ternary epoxy composites materials

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