In-Plane Shear Strength Determination of Composite Materials in Laminated and Sandwich Panels

1997 ◽  
Vol 50 (11S) ◽  
pp. S237-S240 ◽  
Author(s):  
J. R. Vinson
Keyword(s):  
Shear Strength ◽  
Composite Materials ◽  
Test Procedure ◽  
Sandwich Panels ◽  
Laminated Composite ◽  
Adhesive Bond ◽  
Shear Stresses ◽  
Plane Shear ◽  
Laminated Composite Materials

A simple test procedure is available to determine the in-plane shear strength of laminated composite materials, as well as other orthotropic and isotropic advanced material systems. The test apparatus is simple, inexpensive, and the flat rectangular plate test specimen is not restricted in size or aspect ratio. In addition to its use for laminated composite materials, the test can also be used for foam core sandwich panels. In sandwich panels, the tests can be used to determine the in-plane shear strength of the faces, the core and/or the adhesive bond between face and core. The shear stresses developed vary linearly in the thickness direction and are constant over the entire planform area.

Determination of In-plane Shear Strength of Unidirectional Composite Materials Using the Off-axis Three-point Flexure and Off-axis Tensile Tests

2010 ◽  
Vol 44 (21) ◽  
pp. 2487-2507 ◽  
Author(s):  
G. Vargas ◽  
F. Mujika
Keyword(s):  
Shear Strength ◽  
Composite Materials ◽  
Tensile Tests ◽  
Unidirectional Composite ◽  
Point Of View ◽  
Experimental Point ◽  
Plane Shear ◽  
Lift Off ◽  
Flexure Test

The aim of this work is to compare from an experimental point of view the determination of in-plane shear strength of unidirectional composite materials by means of two off-axis tests: three-point flexure and tensile. In the case of the off-axis three-point flexure test, the condition of small displacements and the condition of lift-off between the specimen and the fixture supports have been taken into account. Some considerations regarding stress and displacement fields are presented. The in-plane shear characterization has been performed on a carbon fiber reinforced unidirectional laminate with several fiber orientation angles: 10°, 20°, 30°, and 45°. Test conditions for both off-axis experimental methods, in order to ensure their applicability, are presented. Off-axis flexure test is considered more suitable than off-axis tensile test for the determination of in-plane shear strength.

Experimental validation of an empirical nonlinear shear failure model for laminated composite materials

2016 ◽  
Vol 51 (16) ◽  
pp. 2331-2345 ◽  
Author(s):  
Masood Nikbakht ◽  
Hossein Hosseini Toudeshky ◽  
Bijan Mohammadi
Keyword(s):  
Composite Materials ◽  
Failure Modes ◽  
Laminated Composite ◽  
Numerical Code ◽  
Shear Stresses ◽  
Shear Damage ◽  
Finite Element Software ◽  
Numerical Predictions ◽  
Open Hole ◽  
Laminated Composite Materials

This paper aims to develop a numerical nonlinear progressive damage model for laminated composite materials considering in-plane and out-of-plane shear stresses in combination with cohesive interface elements to predict the structural response and the failure mechanisms of laminated composite materials. For this purpose, the constitutive models for intralaminar and interlaminar damage modes have been developed as a numerical code by a UMAT subroutine and implemented in commercial finite element software. This model, which is based on the continuum damage mechanics approach, enables to predict the gradual degradation of material properties with five distinct damage parameters for different failure modes; three of these damage factors apply the shear damage contribution as a separate damage mode by a separate damage factor into the model and characterize it by shear damage dissipation energy, and two parameters for fiber and matrix in transverse directions. Also, a series of experiments have been performed to characterize and validate the nonlinear behavior of glass/epoxy laminate. This model is used to predict the behavior and the final strength of open-hole tension specimens. A reasonably good agreement was also achieved between numerical predictions and experimental observations in terms of shapes, orientations and sizes of individual intraply damages induced around the notch and also the final strength of open-hole tension specimen.

Stress and conditions of continuity of laminated composite materials

1974 ◽  
Vol 10 (4) ◽  
pp. 394-401 ◽  
Author(s):  
V. A. Kolgadin ◽  
G. P. Bogatyr' ◽  
V. I. �tokova
Keyword(s):  
Composite Materials ◽  
Laminated Composite ◽  
Laminated Composite Materials

Achieving of sandwich-like laminated composite materials for robust superhydrophobicity, rapid photochromism and photo-mask writable media

2022 ◽  
Author(s):  
Guofeng Zhang ◽  
Linqi Huang ◽  
Fuchao Yang
Keyword(s):  
Composite Materials ◽  
Laminated Composite ◽  
Switching Rate ◽  
Lotus Leaf ◽  
Water Properties ◽  
Laminated Composite Materials ◽  
Photochromic Materials ◽  
Poor Stability

Photochromic materials with anti-water properties have impressed practical values, but their applications are severely hindered by poor stability and slow colour-switching rate. Inspired by the superhydrophobicity of lotus leaf and...

scholarly journals RESEARCH OF Al AND Mg MATRİX HYBRİD LAMİNATED COMPOSİTE MATERİALS

2021 ◽  
Vol 05 (01) ◽  
pp. 11-15
Author(s):  
Mustafa Babanli ◽  
Yusif Tanriverdiyev
Keyword(s):  
Composite Materials ◽  
Magnesium Alloy ◽  
Metal Matrix ◽  
Laminated Composite ◽  
Industry Studies ◽  
Laminated Composite Materials ◽  
Carbon Based Nanomaterials ◽  
Carbon Based

The main purpose of this research is to select suitable matrices and fillers for the preparation of composites that meet modern requirements to meet the needs of a rapidly growing industry. Studies in various databases have shown that metal-matrix hybrid laminated composite materials, mainly aluminum and magnesium alloy plates, are used as matrix materials, while carbon-based nanomaterials are used as fillers. Keywords: composition, matrix, aluminum, magnesium.

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