Directional Interlaminar Shear Strength (ILSS) of nano-modified epoxy/unidirectional glass fibre composite

Seawater aging-dominated delamination failure is a critical design parameter for marine composites. Modification of matrix with nanosized reinforcements of fiber-reinforced polymer composites comes forward as an effective way to improve the delamination resistance of marine composites. In this study, we aimed to investigate experimentally the effect of halloysite nanotube nanoreinforcements on the fracture performance of artificial seawater aged basalt–epoxy composites. For this, we introduced various amounts of halloysite nanotubes into the epoxy and the halloysite nanotube–epoxy mixtures were used to impregnate to basalt fabrics via vacuum-assisted resin transfer molding, subsequently. Fracture performances of the halloysite nanotubes modified epoxy and basalt/epoxy composite laminated were evaluated separately. Single edge notched tensile tests were conducted on halloysite nanotube modified epoxy nanocomposites and the average stress intensity factor (KIC) was increased from 1.65 to 2.36 MPa.m1/2 (by 43%) with the incorporation of 2 wt % halloysite nanotubes. The interlaminar shear strength and Mode-I interlaminar fracture toughness (GIC) of basalt–epoxy hybrid composites were enhanced from 36.1 to 42.9 MPa and from 1.22 to 1.44 kJ/m2, respectively. Moreover, the hybrid composites exhibited improved seawater aging performance by almost 52% and 34% in interlaminar shear strength and GIC values compared to the neat basalt-epoxy composites after conditioning in seawater for six months, respectively. We proposed a model to represent fracture behavior of the seawater aged hybrid composite based on scanning electron microscopy and infrared spectroscopy analyses.

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Effect of hygrothermal aging on the interlaminar shear strength of a carbon fibre composite

Procedia Structural Integrity ◽

10.1016/j.prostr.2019.07.063 ◽

2019 ◽

Vol 14 ◽

pp. 849-854 ◽

Cited By ~ 4

Author(s):

Kishora Shetty ◽

Shylaja Srihari ◽

CM Manjunatha

Keyword(s):

Shear Strength ◽

Carbon Fibre ◽

Fibre Composite ◽

Interlaminar Shear Strength ◽

Carbon Fibre Composite ◽

Hygrothermal Aging ◽

Interlaminar Shear

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Modified water diffusion kinetics in an unidirectional glass/fibre composite due to the interphase area: Experimental, analytical and numerical approach

Composite Structures ◽

10.1016/j.compstruct.2012.09.044 ◽

2013 ◽

Vol 97 ◽

pp. 296-303 ◽

Cited By ~ 44

Author(s):

Y. Joliff ◽

L. Belec ◽

J.F. Chailan

Keyword(s):

Glass Fibre ◽

Fibre Composite ◽

Numerical Approach ◽

Water Diffusion ◽

Diffusion Kinetics ◽

Unidirectional Glass ◽

Glass Fibre Composite

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The Interlaminar Shear Strength Test of Helical Wound Glass Fibre Reinforced Epoxy Laminates Subjected to Hydrothermal Ageing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.554.391 ◽

2014 ◽

Vol 554 ◽

pp. 391-395

Author(s):

M.S. Abdul Majid ◽

Mohd Afendi ◽

R. Daud ◽

N.A.M. Amin ◽

Azizul Mohamad ◽

...

Keyword(s):

Shear Strength ◽

Glass Fibre ◽

Mechanical Test ◽

Monitoring Program ◽

Interlaminar Shear Strength ◽

Test Method ◽

Internal Quality ◽

Glass Fibre Reinforced ◽

Interlaminar Shear ◽

Composite Pipes

This paper presents the experimental investigation of interlaminar shear strength (ILSS) tests of helical wound glass fibre reinforced epoxy (GRE) pipes subjected to hydrothermal ageing. Currently, the test is being used by composite pipes manufacturers as the alternative internal quality monitoring program for detection of manufacturing changes and reconfirmation of the design basis of composite pipes. The test specimens were cut in hoop direction from helically wound GRE composite pipes after exposure of 0, 250, 500, 1000-hour water at 80°C. The ILSS tests of the GRE samples were then conducted in accordance with ASTM D2344, and the results were analyzed to evaluate the durability performance of the laminates. The results show a clear degradation in the bonding strength between fibres and resin system interface after 500-1000-hour water exposure at 80°C. This findings show a good agreement in the trend observed with the standard qualification procedure elucidated in ASTM D2992 standard. Hence, ILSS test shows a great potential to be used as the internal short-term mechanical test method to qualify a new resin, curing agent or glass fibre in accordance to the next approach.

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