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This paper is in four parts. The first is related to general considerations and experimental   analyses, and each of the others is related to different approaches to the theoretical   analyses of the mechanical behaviour of weft-knitted fabrics and weft-knitted reinforced   composites made of glass fibre. The objective is to find ways of improving the mechanical   properties and simulating the mechanical behaviour of knitted fabrics and knitted   reinforced composites so that the engineering design of such materials and structures   may be improved.   In Part IV the technologies for weft-knitted 3D complex shape preform development are   surveyed and a third model is presented. This a 3D model based on FEA (finite element   analyses). A solid representation of a 2D yarn is built up, and an MES (mechanical event   simulation) is applied to obtain a 3D-shaped loop. The final knitted fabric geometry is   obtained by interacting this loop with the adjacent loops, according to the dimensional   properties of the knitted fabrics and using an MES. Finally, the geometry of the   reinforcement inside the composite is built up, and the composite material is divided into   small tetrahedric elements to obtain a mesh of finite tetrahedric elements (FEA). The   average values of the mechanical properties are obtained with FEA and compared with   the experimental ones.

autex research journal

MODELLING AND SIMULATION OF THE MECHANICAL BEHAVIOUR OF WEFT-KNITTED FABRICS FOR TECHNICAL APPLICATIONS: Part IV: 3D FEA model with a mesh of tetrahedric elements