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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

Edouard Ferry

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  1. KTex Pattern is part of the KTex Family. It is launched from HyperMesh as a TCL script. It aims at building finite element (FE) models of any kind of weave (1D, 2D and 3D). To do so, some inputs are required, such as dimensions of the fibers, the desired weaving pattern, the material of the fibers, the type of elements to mesh the fibers and the desired size of weave. With all these parameters, a FE model of the weave is automatically generated and meshed. A database of many fiber cross sections is available, but bespoke cross sections can be generated. Fibers can be meshed with shell or solid elements. The user has the choice to generate only the Representative Elementary Volume of the weave, or to specify rectangular dimensions, or even to use a line created in HyperMesh in order to fill it with the described weave. A database of commercial weaves is available in the software but bespoke patterns can be generated. Several plies can be stacked on top of each other, mixing all the different possibilities of the software. An angle can be defined from one ply to the other. This gives the possibilityy to generate many kinds of stacks, potentially including patches. Attached is an overview video of the software capabilities. For more information, reply to this topic or contact support at : support_ktex@cedrem.fr KTexPattern_Overview_v2.mp4
  2. As a first post in this topic, I would like to introduce you the KTex Family modules dedicated to simulating fabrics in finite element models. Four different modules are available within the KTex Family, each one featuring its own specificities. A first module, called KTex Pattern, aims at building finite element models of bespoke fabrics at the scale of the yarns. 1D, 2D and 3D weaves are available. Some common industrial weaves are available in a database but bespoke weaves can be defined through a weaving matrix. Shell or solid elements can be chosen. The result is a meshed model at the scale of the fibres in HyperMesh. A second module, called KTex LayUp, helps setting up a finite element model representing the lay-up process. A mould geometry and a fabric finite element model are needed. The module automatically creates the counter mould, the contact interfaces between fabric yarns and mould parts and the boundary conditions of the simulation (squeezing speed, time of calculation...). The result is a ready-to-export model in HyperMesh. The third module is very similar to KTex LayUp, but dedicated to the winding process. It is called KTex Winding The input parameters are the core radius, the dimensions of the ribbon, and the pattern followed during the winding. Two outputs are possible. The first one is only for visualisation purposes and allows localising the areas where the ribbons cross with each other. These areas are usually the weakest ones. The second output is a ready-to-export model in order to run a simulation featuring chronological PLOADS on the ribbons to reproduce the tension in the ribbons during the real process. Finally, the fourth module is called KTex WovenProperty. It is a fully independent software (outside from HyperMesh). The aim is to calculate the homogenised macroscopic mechanical properties of any given composite ply. It can be a 1D, 2D or 3D ply. There is a database of common weaves but bespoke weaving patterns can be defined. Common fibre and matrix materials are also available in the module database but bespoke ones can be defined. To begin with, you will find below a webinar recording, presenting all the modules in details, and featuring case studies performed with KTex Family modules. Do not hesitate to ask questions or write what you think about these tools. Regards, Edouard 2016-10-27 10.04 Predicting impact of manufacturing process on composite performance with HyperMesh, KTex Family and RADIOSS.mp4