What is it about?
The arrangement, as well as the properties and the structure of the fibres within the yarn and the yarns within the fabric, generate a complex mechanism of deformation in such material. Therefore, intends to develop a theoretical model of the mechanical behaviour of the twill weave based on previous researches concerning the simplest plain weave. However, scaling up from the plain to the twill weave is not a direct transformation due to the non‐symmetry of the latter. The finite element method does not require simplifying hypotheses. Thus, it is possible to simulate different stresses, to determine the fabric response and to compare the behaviour of the various structures. This simulation requires the use of a realistic meshing of the basic cell and accurate characterisation of the physical parameters of the material that composes the basic cell. Assuming the material to be elastic, the derived and, consequently, the discreet mathematical formulations of the problem have both been solved. The coefficients from those formulas are then used in the Modulef software. For each stage of the development, uniaxial, biaxial and perpendicular to the fabric plan, tensile tests have been simulated, as well as pure shear testing. The next step consisted of computing the Tresca and Von Mises stresses within the basic cell and the micro‐stress field within the basic cell components.
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Why is it important?
Finite element, Numerical methods, Textiles, Stress analysis
Perspectives
The modelling of textile structures by the finite element method is a new approach based on the combination of geometric and mechanical models. In fact, the characterisation of the mechanical behaviour implies first the definition of the geometry of fabric, then by the construction of the matrices of stiffness and the second member. The finite element method permits construction and a representation of the fabrics by taking into account the yarn undulation, the existence or not of symmetries in the basic cell and the type of contact between warp and weft yarns. The different parameters permit one to obtain a mesh of weaves closest to the reality without any restriction and any simplifying assumption.
Professor Mostapha TARFAOUI
ENSTA Bretagne
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This page is a summary of: Numerical study of the mechanical behaviour of textile structures, International Journal of Clothing Science and Technology, June 2001, Emerald,
DOI: 10.1108/eum0000000005780.
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