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Save invalid elements to user mark?
Hey, every time I'm exporting my solver deck files of my RADOPT opimization the question appears: Save invalid elements to user mark? Yes or No I have found a Tcl command hm_getusermark elems does this show all the elements or just the invalid ones? Because I get a huge number of elements if I type in that command. So my…
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Internal programming error
Hey, every time I run a RADOPT topology optimization the Solver fails and I get this message: *** INTERNAL PROGRAMMING ERROR *** in file "datasetFtoC.c", at location # 488. ERROR DATA: igicmt -1234 Dset ID out of range what can I do? Thanks for your help!
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ソリッドの要素品質に応じて、要素を削除する方法
始めに 本記事では、ソリッド要素の要素品質に応じて、要素を削除する方法を、例題を通して説明します。 材料 /MAT や破断 /FAIL での応力やエネルギなど物理的な意味合いを持つ破断判定による要素削除と違い、要素品質のみでの判定なので、手軽に使える反面、注意しなくてはならないこともありますので、その辺りをお伝えします。 仕組み /PROP/SOLID カード内で指定します。 Vdef_min: 体積変化率が本指定値を下回ったら、要素削除 Vdef_max: 体積変化率が本指定値を上回ったら、要素削除 APS_max: アスペクト比が、本指定値を上回ったら、要素削除 COL_min: テトラ Collapse…
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Accelerating Vehicle Crash Simulations with Altair romAI
Vehicle crash simulations are essential for automotive safety design, but they present a significant computational challenge. High-fidelity crash models can take hours or even days to complete a single simulation, making design exploration and optimization studies extremely time-consuming and costly. When engineers need to…
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Query Regarding location of Altair Resources for Impact Analysis
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Maintaining Bending Plastic Deformation in Hypermesh
Hello, I am working on a simulation to look at the resultant deformation of a part after a bending load is applied. For simplicity, it can be thought to be a fixed-free cantilever. I am applying a load that should exceed the yield stress of the material, but when I release the load I want the part to maintain the resulting…
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/PART カードのシェル板厚情報で、接触判定距離を変更する例題
始めに 2025.1 時点で最も汎用性の高い /INTER/TYPE25 を使うと、シェル要素は自動的に、シェル要素の板厚の半分で接触判定します。 ただ、メッシュを変更せずに板厚だけ変えたりすると、例えばつらつらで作成してあった接触部分は、初期干渉したり、隙間ができたりします。 シェル要素は、板厚定義だけ変えて流しなおすことが多いので、要素の板厚とは異なる場所で、接触判定距離を指定できると便利です。 それが /PART カードの Thick オプションです。 これは接触判定距離にのみ使われます。応力ひずみといった物性には影響しません。 例題 10mm の隙間をあけておいて、ソリッド要素をシェル要素に押し付けていきます。…
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Output blocks TH/NODE , TH/BODY , TH/PART , TH/INTER are not updated in engine output 0004.rad
My model as output blocks TH/NODE , TH/BODY , TH/PART , TH/INTER , wit detailed output criteria set under each block. But iam not getting this desired output data in output 0004.rad file Iam using Hypermesh with Radioss Profile. Below is the output data i got in my output file /RUN/TopHat_FullModel_Radioss/1/…
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Unable to convert Hypermesh model with Optistruct profile to Radioss
While trying to convert the Hypermesh Optistruct profile model to Radioss profile , iam getting this error 2. Earlier, i was able to complete the work in Radioss profile, but whenever i reopen the model it used to be in optistruct profile even though saved in Optistruct 3. Now when i open the above model iam getting the…
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Unexpected results in Radioss
https://us.v-cdn.net/6038102/uploads/VJ0WFHAJ148E/20251030-2232-04-5558827.mp4 Does anyone know how I can solve this problem in Radioss or what causes it? Is it because of the contact friction value? Or is it due to incorrect material failure data?
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ソリッド要素の異方性の例題: 円筒座標系を用いた材料方向の指定
始めに 本記事では、例題を通して、円筒座標系を使って、ソリッド要素の材料座標系を決める方法を説明します。 /PROP/SH_ORTH (/PROP/TYPE6) でのルール 材料座標系は、ソリッドプロパティ /PROP/SH_ORTH で定義します。 利用するのは Ip, Vx,y,z, Px,y,z の項目です まず、円筒座標系を使う場合は Ip=24 とします。 次に、円筒軸の向きを示すベクトルを Vx, Vy, Vz で定義します。例えば全体座標系の Z 軸を向いているなら Vx=Vy=0, Vz=1 という具合です。ベクトルの大きさは関係ありません。 最後に、円筒軸上の座標の一つを Px, Py, Pz で定義します。 これで…
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SPH 同士を衝突（接触）させる例題
始めに 本記事では、SPH 粒子同士を衝突、接触させる例題です。 SPH とシェルやソリッド要素を接触させる例題ではありません。完全に別物です。それについてはこちらを参考にしてください。 https://community.altair.com/discussion/41504/sph-%E3%81%A8%E6%A7%8B%E9%80%A0%E3%83%A1%E3%83%83%E3%82%B7%E3%83%A5%E3%81%AE%E6%8E%A5%E8%A7%A6%E3%81%AB%E9%96%A2%E3%81%99%E3%82%8B-tips 本記事では、SPH…
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Action Required: Update to Linux RHEL/CIQ Rocky 9.4 for HyperWorks 2026 Release
Introduction To our valued Altair community, This article provides important advance notice regarding a required change for the upcoming HyperWorks 2026, which is scheduled for release later this year. To maintain the highest standards of security and performance, we are updating the supported Linux operating system…
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SPH Components Not Visible After Simulation in Altair Radioss
I am attempting to model the soil–tool interaction using Altair Radioss. The soil bin was meshed using SPH (Smoothed Particle Hydrodynamics) particles. The input files used for the setup are attached. However, after running the simulation, the SPH components are not visible in the results. I am unable to identify the cause…
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剛体 /RBODY と強制変位 /IMPDISP が過拘束でおかしな結果となる例題
はじめに Radioss の剛体 /RBODY は、自由に動き回っていることが多いので、ついつい忘れがちですが、剛体の真ん中の節点で、周りの節点の運動を完全に拘束している、非常に強い拘束条件です。 ですので、このように、剛体の周りの節点に同じく拘束条件である強制変位 /IMPDISP を付けるとおかしな結果になってしまうことがあります。 本記事ではこの例題について解説します。なおタイトルでは /IMPDISP としていますが /IMPVEL, /IMPACC にも共通します。 例題 ダウンロード: https://us.v-cdn.net/6038102/uploads/BPDVOSPIJDYO/model01.7z このモデルは、物体を…
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Radioss+ESL Dynamic Video Tutorial
Engineers want to perform optimization after running Radioss to improve product performance. ESLDynamic is very user-friendly to perform optimization with Radioss. It can directly read the Radioss model and result files. Here is video recording with step by step instructions for how to use ESL dynamic to perform topology…
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SPH Components Not Visible After Simulation in Altair Radioss
I am attempting to model the soil–tool interaction using Altair Radioss. The soil bin was meshed using SPH (Smoothed Particle Hydrodynamics) particles. The input files used for the setup are attached. However, after running the simulation, the SPH components are not visible in the results. I am unable to identify the cause…
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コネクタ要素 (/PROP/CONNECT, /PROP/TYPE43) を横に引っ張っても応力は出ないという例題
初めに /MAT/LAW117 などの接着モデル材料 (*1) に使うヘキサ要素には、専用の要素プロパティ /PROP/CONNECT (/PROP/TYPE43) を割り当てます。 この材料を、横方向に引っ張っても、応力が一切出ません。それを示す例題と、なぜそうなるのか、というのを、本記事で説明します。 *1) 接着剤の材料そのものであるプラスチックの材料を良く表すのではなく、接着部分のモデル化に便利な材料、という意味で、接着材料ではなく、接着モデル材料と表現しています。 例題 ダウンロード: https://us.v-cdn.net/6038102/uploads/IEIF7KUCYIEV/model01.7z…
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Starting with Radioss
The purpose of this post is to guide you and to get you started with Radioss, through a series of articles that cover the basics of Radioss. 1 Starting with Radioss First, if you want to understand why people are doing Crash analyses (and similar ones) and see what Radioss is and for which applications it can be used and…
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Oscillations in my model
Description: Oscillations and energy errors in my Radioss model Product/Topic Name : Radioss 2025 Hi everyone, I'm trying to model a knee prothesis in Altair Radioss I modelled it as represented below : The tibial implant is not represented A rotation movement is applied to the femoral implant, around the Flexion extension…
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Accessing Statistically-Based Design-Allowable Properties Using MMPDS Data in AMDC
In finite element analysis (FEA), the accuracy of your simulation is only as good as the input data - particularly the material properties. In safety-critical applications such as aerospace, defense, and automotive, using nominal or average material properties is not enough. These values don’t account for natural…
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1D Spring creation Using Altair Hypermesh or Simlab Radioss.
Hi, In 1D spring Creation, How to create a spring between two faces? I used two methods, 1) Create a Rbe 2 in the two spring connecting surface, then directly create a spring by picking two center nodes of rbe's from the two surfaces. 2) Create a center nodes just below the two spring connecting surfaces, then create a…
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What's the difference between OptiStruct's THETA and Radioss' PHI when assigning material direction?
So, I know exactly how the material direction is assigned in OptiStruct, starting from G1-G2 and rotating in respect to the normal of a shell element. But what about Radioss? Is phi exactly the same? Daniele
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📅August Community Roundup +Exciting Announcements 📢
Hi Everyone, Sorry for the delay on our August roundup! Its been a busy month, but we didn't want to miss highlighting all the great activity in our community. 📢Introducing the Altair RISE Program Get ready for something special! Our RISE Program(Recognition for Innovation, Solutions & Expertise) officially launched in…
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Impact analysis
I performed impact analysis on a plate . I used ENG /ANIM/SHELL/DAMA to get damage output The result shows damage value as DAMAGE(Layer 1s) ..DAMAGE(Layer 5s). The damage value comes for 5 layers. Which layer shall i consider to judge whether material failed or not ? Do i have to take maximum of all layers or minimum of…
