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Edouard Ferry

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Edouard Ferry last won the day on August 21 2019

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  1. Hello Jojo, Thanks for your interest in our products. First of all, can you tell me which version of KTex you are trying to use? Normally, the latest version of KTex is 3.0 and it is compatible with HW 2017, but not HW 2019 yet. Can you tell me more about your actions when you open KTex? Some users try to launch KTex from HyperMesh Desktop instead of HyperMesh, which causes problems. Could you join a snapshot of the error you get when you try to open KTex? The only documentation available are the pdf files in the zip-files. You can access them from the Help menu when the tools are open. You can find some tutorials on this website or on Altair website. Some articles are also available. Here are some links. https://www.altair.com/resource/ktex-family-datasheet https://blog.altair.com/simulate-manufacturing-processes-cedrem-ktexfamily/ Best regards, Edouard
  2. Dear Nasim, No problem. In fact, KTex WovenProperty only calculates a homogenized macroscopic material card for a ply. There is no mesh. The only thing you can import is the material card. It is comparable to HyperLaminate. KTex WovenProperty exports the results in different formats. The .fem file is for OptiStruct and the .rad file is for RADIOSS. Best regards, Edouard
  3. Dear Cna, The first output I would think of, would be to project the elemental frame of your fibers onto the macroscopic elements of your radome. I am not sure this output is available directly in HyperView, but I am sure you can create a contour based on the elements coordinates. You should then be able to compare the angles of the weft elements to the warp ones. And this comparison could be a angle change, as you know the initial angle of your fabric. Does this seems to answer your question? Best regards, Edouard
  4. Dear Cna, Normally, the KTex zip file can be downloaded on Altair Partner Alliance portal. If it is enabled in your license file and you can not download it, there might be a problem on your Altair Partner Alliance account. Let me know if you still have some trouble, I will reach Altair technical service. Best regards, Edouard Ferry
  5. KTex LayUp is dedicated to representing one of the composite materials manufacturing processes: the moulding or RTM process. To do so, the fabric has to be compressed between a cast and a die. Usually, to simplify the numerical simulation, the cast and the die present very close geometries. KTex LayUp automatically creates one from the other. The user has the possibility to use any existing model of one of the two in KTex LayUp. The tool will automatically create the complementary shape and translate it before launching the simulation. The attached video is a tutorial to create a bespoke mould geometry to be sure it will be usable in KTex LayUp. KTexLayUp_Mold_creation_v2.mp4
  6. HUByx is a finite element human body model developed by CEDREM. It features many internal organs as well as a representation of the internal fluid. This enables a pressure propagation inside the body due to an impact or a blast. The model has been validated for two kinds of loadings. The first one is medium speed impacts. The numerical force vs deflection curves at different locations were compared to the experimental ones. The second one is blast loading. An experimental setup with torso surrogates was reproduced. The numerical pressure vs time curves in different organs were compared to experimental ones. A presentation video is available. For now, only the torso is available in the Academic Partner Alliance. HUByx_overview.mp4
  7. KTex LayUp is dedicated to representing one of the composite materials manufacturing processes: the molding or RTM process. Its main objective is to automatically set-up a ready-to-run finite element model simulating this process. To do so, two input parameters are needed: the fabric and the mold. Some molds and fabrics are included in the tool database, but bespoke ones can also be created. A video regarding mold creation will come later. When selecting a fabric, two options are available: REV or Size/Shape. The REV option only needs the Representative Elementary Volume of the fabric. This REV is then duplicated and translated as many times as needed to be bigger than the mold. But the final geometry of the fabric to be molded will always be a square. The Size/Shape option needs the geometry of the fabric to be molded. This fabric can be a stack of several plies. It can feature several plies of different geometries, thicknesses or patterns... Anything is possible in order to represent the real plies that are to be molded. The user is free to define the fabric, but the user has to be careful as mistakes will not be detected. The attached video gives an example of the difference between the two options. KTexLayUp_REVvsSHAPE.mp4
  8. 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
  9. 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
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