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Export element data for topology optimization analysis in hyperworks
Hey there! I need some help with exporting data of my object and results in hyperworks. I wish to export the data of elements which includes their coordinates or some spacial indication, which nodes/elements experience fixed constraint boundary condition, which nodes/elements experience load applied, and finally when we…
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Why does the holding plate move unexpectedly in CNTNLSUB, even with SPCs applied?
I have a transient nonlinear analysis in OptiStruct with two subcases to analyze (subcase 2 is a CNTNLSUB relative to subcase 1). In the first subcase, a holding plate engages with the rubber teeth to geometrically position them in their final location, having in consideration their final stress state (which is important…
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45度の材料試験応力ひずみデータから、どのようにしてせん断応力とせん断ひずみの関係にしたらよいのでしょうか。
はじめに材料に異方性がある場合、0 度方向の特性なら、0度方向に揃えた材料の引張試験をして得られる、応力ーひずみの関係は、そのまま σ11 と ε11 の関係になります。 90度の場合も、90度方向に揃えた材料の引張試験をして得られた応力ーひずみの関係が、そのまま σ22ーε22 の関係になります。 しかし 45度の場合は、残念ながらそうなりません。45度に揃えた材料の引張試験を行って得られた応力ーひずみの関係は、単純に σ12-γ12 の関係になってくれません。 この部分ですが、あまり多くのコンテンツがなくて、必要なときになかなか出てこないと私自身感じていたので、本記事で、まとめとして記しておきます。…
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Can i build my own motor model (6 phase induction machine) in Flux without going through FluxMotor ?
I want to now if it is possible to build my own motor model in Flux or SimLab because i can´t find it in FluxMotor predesigned catalogue to applicate a Multiphysics optimization for it with HyperStudy or E-Motor Director tools. Thanks for response.
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How i can export Flux modal to HyperStudy environment to do multidisciplinary optimization ?
I can´t find the predesign model of 6 phase induction machine in FluxMotor so i create my own modal of the machine in Flux. Thanks for response.
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Radioss Solver Run Issue on AMD threadripper pro processor.
Hi Team, We are trying to run a Radioss simulation, which is taking longer time on AMD processor compared to Intel. And also, when the same run is carried only on AMD processor with multicore usage, 32 cores is taking lesser time than 64 cores whereas to happen vice-versa. For example, 32 cores AMD processor is taking 0.5…
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Contacts in Simlab
Hi Good Afternoon, I want to perform the stress analysis for the below mentioned Handle Model. The Handle contains two parts, Top and Bottom. these are connected using Screws ( shown image) . Apart from screw joint, the two parts are mated each others. Full Model ( Top cover is in transparent view) Top View ( For Screw…
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Find the elements in "Zone"
I modeled using PCOMPP and trying to view ABD matrix but the Engg. constants are under zones. Is there a way to figure out what elements are under a given zone?
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ERROR 1026
Hi I am trying to perform analysis of a model that consists of 1d beam elements and 3d tetra elements. I am getting this error 1026 duplicate id's found. I have tried multiple techniques to solve like renumbering and deleting duplicate elements but still the problem persists. Can anyone please help?
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ERROR:Not enough memory
Hi！I am using Optistruct to conduct a transient NVH simulation, there's an error: "Not enough memory. (error code -2)". My run option is "in-core, -nt 18". As you can see, the “.Out” file shows Estimated Memory (RAM) for In-Core Solution is 85002 MB and my computer has enough memory(248073 MB RAM) . Could you please advise…
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I was looking for a sample deck for Non-linear thermal analysis in OPTISTRUCT
I was looking for a sample deck for Non-linear thermal analysis
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機構解析と構造解析の連成シミュレーションの例題（構造：Explicit対応）
下記で、MotionSolveとOptiStructの非線形過渡応答解析を連成させた例題を公開しました。 従来バージョンでは、OptiStruct/Implicitとの連成のみサポートされていましたが、Altair Simulation 2024より、OptiStruct/Explicitとの連成がサポートされ、非線形性が高く収束性の困難な問題に対し、計算が安定・高速化されます。 車両と燃料タンクの例題をOptiStruct/Explicit用に更新しました。 PDFの設定手順書とモデルデータをダウンロードしてご利用ください。 Altair Simulation 2024以上が必要です。 使用ソフト： マルチボディシステムシミュレーション|…
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Layout of HyperGraph bar charts
Hello, I am using HyperGraph 2024.1 to plot a bar chart of the modal effective mass from a modal analysis. I am working with the HGEFFMASS option in the OUTPUT card of OptiStruct to generate the data. However, I am having difficulty formatting the resulting bar chart. Specifically, I cannot find a way to: Change the font…
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Issue with Altair Inspire OptiStruct License in Personal Edition
Hi, I recently downloaded the program and I am experiencing an issue with the OptiStruct license in Altair Inspire Personal Edition and would appreciate any help you can provide. Specifically, when I try to run a topology optimization, an error message appears indicating that a license for Inspire OptiStruct Solver feature…
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How to export only mass matrix to an ASCII file (avoid stiffness matrix)
Dear all, Does anyone now how to export only the mass matrix of a structure while avoiding to write the stiffness matrix to the same file? I am using OUTPUT,MATRIX,FULL,SPARSE, which writes the stiffness and mass matrix to the same ASCII (.full.mat) file. However, since I have a big model, it is taking ages to write the…
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Auto - SPC d.o.f.s reason.
Dear OptiStruct Users, I have a question concerning DOF 1, 2, and 3 in the picture next to grid number 78029001. What could be the reason for their presence? I understand DOF 4, 5, and 6 can be between rigid and solid connections, because a solid has only three DOFs and eliminates 4, 5, and 6 from RB2 and RB3 if it is…
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DUCTILE DAMAGE INITIATION AND EVOLUTION (INIEVO) IN OPTISTRUCT IMPLICIT-EXPLICIT
The INIEVO criterion allows a two-step failure approach, divided into an initiation phase, in which damage has no effect on the stress computation, and a damage evolution phase, in which a stress softening can be generated. Ductile material behavior can be modelled in Optistruct with Damage Initiation DMGINI, and Damage…
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Pretension -Subcase
I will create analysis with pretension. However, when I connect the subcase to the other subcase, I get the pre-tensioning result in the first step. However, when the 2nd subcase starts, the analysis starts from beginning again. Program does not see the pretension step.
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Element Quality Frivolity: Are My Elements Bad?
In FEA, elements are like dogs in that they are all good boys. However, the FEA textbooks would have you believe that that bad quality elements are bad and they should feel bad. They may say so without elaborating, the reality being that element quality requires a good grasp of the shape functions at hand. Since I don’t…
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Nonlinear Excersice - Error 4966
Hi everyone, I'm recently started to learn Hypermesh and Optistruct from one of my classes. We are working with the model attached to this message, it's a nonlinear analysis of a suspension element. When I run this model, I keep getting error 4966, which, according to the documentation, it means that minimum time to solve…
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Non Linear Explicit
In Non linear Explicit - Optistruct Solver, When we are using TTERM=0.01 Load is applied as force in Z direction, Is this mean, TTERM=0.01 means terminate the RUN at 0.01 time and Load is also applied as F*0.01 , Full load will get applied at Time =1.
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Rotational inertia of nodes with 6 DoF ommited in (.full.mat) file
Dear all, I am extracting the mass matrix of a structure modeled with shell elements (CQUAD4) using OUTPUT,MATRIX,FULL,SPARSE. However, the rotational inertia corresponding to the nodes (with 6 DoF) is omitted in the .full.mat file. Below is an example of the results I am getting, for a lumped mass matrix, where the…
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How is Composite Failure Index calculated?
Hello everyone, I am currently working with Hypermesh/Hyperview and Optistruct. I was wondering, how the Composite Failure Index is calculated exactly. I know the other failure mechanims (Hill, Hashin...) since there is a lot of documentation online. But I want to know the equations and the general math behind the…
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Joint Panel
Hi everyone, I need to create a revolute joint. As of now I am creating joints by creating C bush and making the required Rotational dof Free and other Dof as rigid. Recently I came across the Joint panel. While looking at documentation it metioned as below In below image we can see the joint panel. Can we use it for FEA…
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OptiStruct のMATMDS と積層シェル要素の１要素例題モデル
始めに 本記事では、OptiStruct 向け MultiScale Designer 材料 MATMDS を積層シェル要素に適用した 1要素モデルを示します。 1要素例題モデル 例題モデルのダウンロードはこちら matmds_1elem_example.7z 動作確認、作業にはバージョン 2024.1 を利用しています。 OptiStruct モデルの説明 作業の順番的には MultiScale Designer が先なのですが、MultiScale Designer は GUI 的になんとなく雰囲気で使うことができる可能性が高いので、最初に OptiStruct…