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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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  1. Yes @George P Johnson , I read this section, I indicated this in the first message. My question is: is this the only material law (LAW24) that is suitable for my task? This material law for iron-concrete. 1. Maybe there is a separate model of brittle fracture of tension-compression. 2. Or there are two models of brittle fracture: one for compression, another for stretching, and they can be used simultaneously. And these models can be used in conjunction with the Johnson-Cook material law. Really, to solve the problem of destroying any brittle material (cast iron, high-carbon steel, graphite, ceramics, glass etc.) with complex loading, there is only one way - to use a model of iron-concrete (LAW24) ??! =(
  2. Hello @George P Johnson ! I already read a help about LAW27, but it's ONLY for Shells & Sandwich Shells and damage occur ONLY in tension. My model - Solid. My model should have two possible of failure: tensile & compressive, because I have bending load. P.S. Сarbon steel (сast iron) also has a different tensile-compressive strength. In the case of longitudinal bending, it is not known in advance what will occur before: compression failure or failure at stretching.
  3. Hello Colleagues ! I read: HELP > RADIOSS > Reference guide > Starter Input > Materials > Failure models / Elasto-Plastic Material / Concrete and rock materials RADIOSS THEORY MANUAL 14.0 ver. - July 2005 LD FEA PART 2 RADIOSS > Tutorial and Example > Examples47 I'm looking for the material law and failure model that would meet my needs: 1) my object - solid 2) my material - brittle elasto-plastic (without yield stress) 3) my material - strength-different (failure tensile stress = 40 MPa, failure compressive stress = 400 MPa) 4) my load - transverse bending eg cast iron, silicified graphite, i.e material corresponding to the diagram in my picture. In my opinion, the most suitable - LAW24 (concrete). It may be better to use another law ? What do you advise me? But I do not fully understand LAW24 card. p0 (density) - ok, i have Ec - ok, i have fc - failure compressive stress ? - if yes, ok, i have ft - failure tensile stress ? - if yes, ok, i have fb - biaxial compressive/tensile or bending stress ? I have failure bending stress = 100 MPa f2 - what is it ? S0 - what is it ? Ht = -Ec - ok Dsup - what is it ? (not use in Example47, value 0) - Do I need this? epsmax - what is it ? (not use in Example47, value 0) - Do I need this? Hv0 - what will this value give me? I don't have it. (not use in Example47, value 0) And E , sigma_y , Et , alpha1 , alpha2 , alpha3 - for steel in concrete, don't need me. Help me find the right law, please. And help me understand and find all the parameters.
  4. Hello & Help me! I worked with geometry in HyperMesh and a mistake suddenly appeared "A segmentation error occurred. Do you want to save your model?", after which HyperMesh was closed ! Now I can not continue to work! I was looking for a solution, deleting settings and temp, but it does not help! My HM file at the bottom. Save me, I have very little time and here such misfortune! Ekranoplan_V1.hm
  5. Elastic constraints

    Hello @Prakash Pagadala No! It's too easy =) My idea: To determine the rigidity of the plates' nodes in the plane of contact with the beam. (x,y,z,rx,ry,rz) then Set these values for springs (CBUSH zero length). then Get the results of linear static analysis with springs the same as with the plate. In other words, get the results for the beam + plate = the results beam + springs ? Is it possible ? (sorry for my English. I hope you understand my idea)
  6. Elastic constraints

    Hello, everyone! In my scientific work I do a Static Analysis and Linear Buckling Analysis of the beam. The beam is attached to the plate. I want to analyze the beam without a plate model, but given its rigidity. The attached screenshots show that the elasticity of the plate greatly affects the state of stress. How I can make constraints with rigidity for the beam? and How to determine the rigidity of fastening to the plate? The problem is put in a simple form for an example. This approach is necessary for the analysis of models where the basic design is complex, but its rigidity needs to be taken into account, and the analysis area is much smaller and is used many times. Is it possible to solve the model this way and how? I'm waiting for help.