scholarly journals The bias-extension test for the analysis of in-plane shear properties of textile composite reinforcements and prepregs: a review

2016 ◽  
Vol 10 (4) ◽  
pp. 473-492 ◽  
Author(s):  
P. Boisse ◽  
N. Hamila ◽  
E. Guzman-Maldonado ◽  
A. Madeo ◽  
G. Hivet ◽  
...  
Keyword(s):  
Textile Composite ◽  
Plane Shear ◽  
Shear Properties ◽  
Bias Extension Test ◽  
Bias Extension ◽  
Composite Reinforcements

scholarly journals The influence of yarn fineness and number of yarn layers on in-plane shear properties of 3-D woven fabric

2020 ◽  
Vol 29 ◽  
pp. 2633366X1989792
Author(s):  
Liuxiang Guan ◽  
Jialu Li ◽  
Ya’nan Jiao
Keyword(s):  
Image Correlation ◽  
Woven Fabric ◽  
Weft Yarn ◽  
Warp Yarn ◽  
Plane Shear ◽  
Shear Properties ◽  
Bias Extension Test ◽  
Application Potential ◽  
Large Application ◽  
Bias Extension

The 3-D layer-to-layer angle-interlock woven fabric (LLAIWF) has good deformability on a complicated contour, which offers them a large application potential in the field of aerospace. This article mainly focuses on the influence of yarn fineness and number of yarn layers on in-plane shear properties of 3-D LLAIWF during bias extension. Two methods of varying the thickness of 3-D LLAIWF were designed: changing yarn fineness and changing the number of yarn layers. The deformation mechanism of LLAIWF in bias-extension test was analyzed. The effects of two methods on in-plane shear deformation were compared and analyzed. In addition to the data processing on the experimental curve, digital image correlation analysis was conducted on the test photographs, from which shear angles in different area shear angle were measured. The mesostructure of fabric during the bias-extension test was observed. The effect of decreasing yarn layers on the mesostructure of fabric was observed by cutting fabric. The results demonstrated that the yarn fineness and the number of yarn layers play a key role in the in-plane shear properties of 3-D LLAIWF. In addition, the changing of fabric thickness causes that the deformation is asymmetrical. The effect of warp yarn fineness is similar to that of weft yarn fineness during the bias-extension test. Reducing the internal yarns of the fabric created a gap, where the yarns were reduced. This gap will affect the deformability of the fabric.

Experimental and finite element analysis of in-plane shear properties of a carbon non-crimp fabrics at macroscopic scale

2017 ◽  
Vol 52 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Samir Deghboudj ◽  
Wafia Boukhedena ◽  
Hamid Satha
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Model ◽  
Macroscopic Scale ◽  
Element Analysis ◽  
Plane Shear ◽  
Shear Properties ◽  
Bias Extension Test ◽  
Bias Extension ◽  
Composite Reinforcement

Shear deformation of composite reinforcement is the most significant and important mechanism of material characterization. So, in-plane shear properties of composite reinforcement are important parameters for determining application and use of this category of materials. The bias extension test is frequently employed to investigate the in-plane shear behavior of composites fabrics with a length equal to or greater than twice its width. In the first part of this work, bias extension tests on non-crimp fabrics have been conducted. Force and displacement were measured and registered. From obtained data, shear angles and normalized shear forces were theoretically determined. The second part was a finite element analysis of the same test based on hypo elastic model at macroscopic scale. The software ABAQUS/Explicit was used to carry out the finite element analysis in the work.

scholarly journals Draping of Textile Composite Reinforcements: Continuous and Discrete Approaches

2007 ◽  
Vol 16 (4) ◽  
pp. 096369350701600 ◽  
Author(s):  
P. Boisse ◽  
N. Hamila ◽  
F. Helenon ◽  
Y. Aimene ◽  
T. Mabrouki
Keyword(s):  
Finite Elements ◽  
Biaxial Tension ◽  
Textile Composite ◽  
Plane Shear ◽  
Multiscale Materials ◽  
Specific Behaviour ◽  
Unit Cells ◽  
Woven Reinforcement ◽  
Composite Reinforcements

The textile reinforcements used for composites are multiscale materials. A fabric is made of woven yarns themselves composed of thousand of juxtaposed fibres. For the simulation of the draping of these textile reinforcements several families of approaches can be distinguished in function of the level of the modelling. The continuous approaches consider the fabric as a continuum with a specific behaviour. The discrete approaches use models of some components such as the yarns and sometimes the fibres. Different approaches used for the simulation of woven reinforcement forming are investigated in the present paper. Among them, an approach based on semi discrete finite elements made of woven unit cells under biaxial tension and in-plane shear is detailed. The advantage and inconvenient of the different approaches are compared.

scholarly journals Bias extension test on an unbalanced woven composite reinforcement: Experiments and modeling via a second-gradient continuum approach

2016 ◽  
Vol 51 (2) ◽  
pp. 153-170 ◽  
Author(s):  
Gabriele Barbagallo ◽  
Angela Madeo ◽  
Ismael Azehaf ◽  
Ivan Giorgio ◽  
Fabrice Morestin ◽  
...  
Keyword(s):  
Constitutive Expression ◽  
Woven Fabrics ◽  
Woven Composite ◽  
Plane Shear ◽  
Second Gradient ◽  
Proposed Model ◽  
Bias Extension Test ◽  
Bias Extension ◽  
Deformation Patterns ◽  
Second Gradient Continuum

The classical continuum models used for the woven fabrics do not fully describe the whole set of phenomena that occur during the testing of those materials. This incompleteness is partially due to the absence of energy terms related to some microstructural properties of the fabric and, in particular, to the bending stiffness of the yarns. To account for the most fundamental microstructure-related deformation mechanisms occurring in unbalanced interlocks, a second-gradient, hyperelastic, initially orthotropic continuum model is proposed. A constitutive expression for the strain energy density is introduced to account for (a) in-plane shear deformations, (b) highly different bending stiffnesses in the warp and weft directions, and (c) fictive elongations in the warp and weft directions which eventually describe the relative sliding of the yarns. Numerical simulations which are able to reproduce the experimental behavior of unbalanced carbon interlocks subjected to a bias extension test are presented. In particular, the proposed model captures the macroscopic asymmetric S-shaped deformation of the specimen, as well as the main features of the associated deformation patterns of the yarns at the mesoscopic scale.

Bias Extension Test for In-Plane Shear Properties during Forming - Use at High Temperature and Limits of the Test

2015 ◽  
Vol 651-653 ◽  
pp. 369-374
Author(s):  
Philippe Boisse ◽  
Peng Wang ◽  
Nahiene Hamila ◽  
Kevin Lemeur ◽  
Anton Rusanov ◽  
...  
Keyword(s):  
Boundary Layers ◽  
Plane Shear ◽  
Transition Zones ◽  
Second Gradient ◽  
Different Temperatures ◽  
Gradient Energy ◽  
Bias Extension Test ◽  
Thermoforming Process ◽  
Bias Extension ◽  
Deformation Modes

The results of in-plane shear tests performed on 5-hardness satin woven carbon/PPS thermoplastic prepregs are described. The experimental analyses are based on bias-extension tests performed in an environmental chamber. The results are given for different temperatures on both side of the melting point. This range of temperature is those of the part during a thermoforming process. In another hand it is shown that second-gradient energy terms allow for an effective prediction of the onset of internal shear boundary layers which are transition zones between two different shear deformation modes. The existence of these boundary layers cannot be described by a simple first-gradient model.

Sign in / Sign up

Export Citation Format

Share Document