# Saad Nauman University of Lille, France ENSAIT, France Topic WEAVING OF 3D WARP INTERLOCK REINFORCEMENT ON CONVENTIONAL LOOM.

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Saad Nauman University of Lille, France ENSAIT, France Topic WEAVING OF 3D WARP INTERLOCK REINFORCEMENT ON CONVENTIONAL LOOM

Saad NAUMAN Univ. Lille North of France, F-59000, Lille, France ENSAIT, GEMTEX, F-59100 Roubaix, France

PLAN Introduction Classification of interlock fabrics Weaving of a 3D interlock reinforcement Observations made on photomicrographs Geometrical Modeling

INTRODUCTION Continuum Models Mesostructural Models Numerical Models Alternative Approaches

Why Geometrical approach against Numerical approach? Traditional approach of geometrical modeling Why introduce new approach? GEOMETRICAL APPROACH AGAINST NUMERICAL APPROACH

HIERARCHY Continuous filaments (micro) Multifilament tows (meso) 3D Interlock fabrics (macro)

CLASSIFICATION OF 3D INTERLOCK FABRICS According to the orientation of binding tow Angle Interlock Orthogonal Interlock According to binding depth of tow Through the thickness interlock Layer to layer interlock

CLASSIFICATION OF 3D INTERLOCK FABRICS (a ) Angle interlock/Through-the- thickness binding (c) Angle interlock/Layer-to-layer binding (b) Orthogonal interlock/Through- the-thickness binding (d) Orthogonal interlock/Layer-to- layer binding

WEAVING OF A MULTILAYER INTERLOCK Calculation of reed denting order R.C. = 10/2.5*W = 4 / W Criteria of reed selection: a. To avoid friction and to facilitate weaving b. To suit the conceived geometry Order of warp and weft tows

CONCEPTION OF 13 LAYER INTERLOCK REINFORCEMENT Diagonal redistribution of warp tows inside the reed dent and in the fabric Vertical blocks of warp tows inside the reed dent and in the fabric

NUMBERING ORDER OF WARP TOWS

GEOMETRY OF INTERLOCK REINFORCEMENT In order to study : Reed denting order Numbering order of warp tows

ELEMENTS OF FABRIC GEOMETRY Cross section Trajectory

THEORY OF BLOCKS Blocks of tows Interblock crimp Interblock displacement

BLOCKS OF WARP TOWS INSIDE A REED DENT A Interblock displacement (warp) = A = mm/dent

CONTINUUM OF GEOMETRY Cmax(weft)Cmax(warp) C max(weft) C (warp) > 0 C (weft) > 0 C (weft) = 0 C (warp) = 0

EVOLUTION OF TOW CROSS SECTION WITH TRAJECTORY C max(warp) C max(weft) WEFT WARP

CONCLUSION Modeling of two extreme geometries i.e., C max(warp) and C max(weft) Modeling of cross sectional evolution of warp and weft tows Identification of an architecture on the continuum between C max(warp) and C max(weft)

Thanks Questions

POWER ELLIPTICAL CROSS SECTION

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