Analysis of the in-plane shear behaviour of non-orthogonally textile reinforcements: Application to braided fabrics

The application of the plate twist test method to 3D-woven textile composites was investigated using both numerical analyses of the test set-up as well as experimental results. Comparisons with the widely used V-notched beam shear and 10°-off-axis tension tests are introduced in an attempt to identify the true in-plane shear response. The results of this study demonstrate that with careful specimen preparation and an adequate test fixture precise in-plane shear modulus data can be obtained. Moreover, for 3D-woven textile composites with their large unit cells the plate twist test appears to be superior in revealing the “true” in-plane shear behaviour.

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In-plane shear behaviour of multiscale hybrid composites based on multiwall carbon nanotubes and long carbon fibres

Journal of Reinforced Plastics and Composites ◽

10.1177/0731684415603491 ◽

2015 ◽

Vol 34 (23) ◽

pp. 1926-1936 ◽

Cited By ~ 5

Author(s):

Gustavo Vargas ◽

José Ángel Ramos ◽

Juan De Gracia ◽

Julen Ibarretxe ◽

Faustino Mujika

Keyword(s):

Carbon Nanotubes ◽

Hybrid Composites ◽

Multiwall Carbon Nanotubes ◽

Shear Behaviour ◽

Carbon Fibres ◽

Plane Shear ◽

Multiwall Carbon

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Mechanical Properties Of Sandwich Composites Used For Aerofoil Shell Structures Of Wind Turbine Blade

ICONTECH INTERNATIONAL JOURNAL ◽

10.46291/icontechvol5iss1pp26-37 ◽

2021 ◽

Vol 5 (1) ◽

pp. 26-37

Author(s):

Fatih BALIKOĞLU ◽

Tayfur Kerem Demircioğlu ◽

Ali IŞIKTAŞ

Keyword(s):

Mechanical Properties ◽

Wind Turbine ◽

Turbine Blades ◽

Maximum Load ◽

Operating Conditions ◽

Shear Behaviour ◽

Sandwich Beams ◽

Plane Shear ◽

Compression Load ◽

Four Point Bending

The grid-scored foams contribute significantly to the overall mechanical properties of the sandwich structures, such as aerofoil shell structure of wind turbine blades which are subjected to different loads under operating conditions. The goal of the present paper is to examine the four-point bending, flatwise and edgewise compression and in-plane shear behaviour of sandwich panels composed of composite face sheets of E-glass/ bisphenol-A epoxy resin and plain and grid-scored PVC foams. The four-point bending failure load of the grid-scored foamed sandwich beams increased by 28.1% compared to the plain foamed ones. The flatwise compression strength of samples with grid-scored foam increased by 546% compared to plain foamed samples. The resin grids contributed to an increase in the flat-wise compression stress inducing the core crushing. Under the edgewise compression load, using the grid-scored foam increased the maximum load values by only about 2.9% relative to the plain foam. The reason for this small difference can be addressed as the facings are more effective in carrying the edgewise loadings. With the use of the grid-scored foam, an increase of 38.2% was obtained in-plane shear strength compared to plain foamed sandwich beams. The resin grids improved bonding between the facings and PVC foam.

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