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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. 

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Found 6 results

  1. Hello, Is there any way we can control the thickness of a shell component so that it does not initiate from the midsection creating intersections as shown. (the blue component. ) For Property Type 9 or Type 16.
  2. Composite draping simulation

    Hello, I'm using HyperForm to analyze composite forming. (Version 2017.2) How do I set plain weave and twill in HyperForm? In LAW58, there is a column for entering N1 and N2 values. Is it a parameter to determine the plan or twill?
  3. fabric hinge

    Hi, I am trying to model fabric material in Optistruct with NLGEOM solver. The material model should be orthotropic, membrane behaviour (no bending and transverse shear) and have different modulus of elasticity for tension and compression. There are some issues: 1. Is there another way to define different modulus of elasticity in tension/compression for shell elements? 2. Membrane type behaviour is modeled with MID2 and MID3 set to blank as was suggested in this topic. Alternatively it could be set up with NIP=1 in PSHELLX extension. However, after analysis is completed the result display only the initial configuration. The file is attached for debugging purposes. optistruct_fabric.hm
  4. 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
  5. fabric hinge

    Hi, I am simulating in Radioss a fabric hinge (similar to a living hinge with flexible woven material). Using M19_FABRI material card in combination with P9_SH_ORTH property card I can simulate the out-of-plane bending of the fabric hinge. But simulating the in-plane shear is challenging. In the attached image, the gravity is acting in negative Z direction and the sample is fixed encastre on the left side. The expected behaviour is collapse of the fabric hinge in the middle (between two wood panels). However the sample is behaving like it is made out of uniform elastic material and is only deforming slightly (defromation is 1000x scaled). Does anyone have an explanation? I would also like to use the same material in Optistruct, but I could not find equivalent material law for flexible fabric. any suggestion would be appreciated
  6. Composite Fabric Optimisation

    Hi everyone; I want to know if we are able to use composite fabrics in composite optimisation? I mean, composite fabric = a layer that consist of different oriented fibers and sewed together. Composite manufacturers sell them like this. In all hypermesh composite optimisation tutorials, they use individual plies which are fibers in one direction only. I want to use different fabrics (one is 45,-45,90 - 600 grams and 0.5mm - the other is 45,-45,60,-60 800 grams and 0.75mm for example), and conduct free-size, size and shuffling optimisations using these fabrics. Does anyone know how to do this? Thanks in advance for anyone replies.