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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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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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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…
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Circular edge contact between 2D hole and cylinder in an Assembly (Hypermesh-Radioss)
Hey everyone, I have an assembly of parts (created on NX) and imported into Hypermesh -Radioss to setup a dynamic analysis. I have a cylindrical rod which has a circular edge marked where it goes inside a 2D surface with circular hole. I need to define a contact such that these nodes remain in contact (the part is free to…
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Modeling of Hypervelocity Impact in Composite Laminates with Altair Radioss
This post presents an Altair Radioss solution to simulating hypervelocity impacts on composite laminate. It is based on Meso-scale modeling of hypervelocity impact damage in composite laminates from Aleksandr Cherniaev & Igor Telichev, published in Composites Part B: Engineering, volume 74 (June 2015) [1]. Figure 1: Bullet…
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Ifric=3 で静摩擦、動摩擦を表現する例題
はじめに Radioss の接触カード /INTER/TYPExx シリーズや摩擦定義カード /FRICTION の摩擦モデルには Ifric=3 で指定できる Renard 則というものがあり、これを使うと、学校で習った、静摩擦、動摩擦のように滑り速度で変化する摩擦係数を指定することができます。 本記事では、もっとも簡単に、静摩擦、動摩擦として使ってみる方法と、例題モデルを一つ提示します。 簡単な使い方 まず、学校の理科や物理では、静摩擦係数 0.3, 動摩擦係数はその半分の 0.15 などというように習いましたが、このモデルは、そのような…
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Identify Bolt Loosening due to vibration ?
Hello Team, I want to understand about simulation of Bolt loosening judgement using Hypermesh. How we can check either bolt will be loosen or not ? Thanks & Regards, Aman Yadav JBM R&D 7898916272
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New and Improved Features in Altair Radioss 2025
This article summarizes the updates introduced in Altair Radioss versions 2025 and 2025.1. For complete details, please refer to the attached presentations and the official Altair documentation. Version 2025.1 Altair Radioss v2025.1 Documentation - What's New /DAMP/FREQUENCY_RANGE is a new option that defines constant…
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初速を遅れて与える例題
はじめに Radioss 2025.1 から初速カード /INIVEL に Tstart オプションが入りました。 これによって、自由に初速を与える時刻をずらすことができます。 なお、この Tstart のある行に HyperMesh 2025.1 が対応していないので、テキストエディタで手入力が必要です。例題モデルを HyperMesh 2025.1 に読み込むと Tstart のある行が消えるので、注意しましょう。参考記事はこちら、 例題 ダウンロード: このような単純なモデルです。 /INIVEL カードはこうなっています。インクルードファイル 01_inivel_0000.inc に記載しています。 ちなみに HyperMesh…
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Smoothed Particle Hydrodynamics (SPH)
Is Altair Radioss suitable for modeling soil-tool interaction using Smoothed Particle Hydrodynamics (SPH)?
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Solver conversion to older version
I want to send my hypermesh file to my teacher so that he can check my work and give comment. However, my version is the latest version with Radioss solver 2025 while he has the 2019 version. Is there any way to convert my file to 2019 version or is there any way how he can check my file?
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Which software is helpfull to perform Weld distortion analysis?
I need to perform the welding distortion in the structure. Could you please suggest potential solutions to proceed further?
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ソリッド要素ゆがみ制御オプション Icontrol=1 を利用する例題
始めに シミュレーションをしているとソリッド要素が異常に潰れてしまうことはままあります。下図は 1個のヘキサ要素です。 いくつか原因は考えられますが、一番単純な原因は、そもそもそこまで潰れた時の材料特性が、正しく与えられていないことです。 となると、正しい材料を与えることが、一番の解決策ではないか、と考えられるのですが、問題はそんなに簡単ではありません。なぜなら、私たちは正しい材料特性など、観測することができないからです。…
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Differences between Open Radioss and Student Mechanical Solver
Hello, I try to simulate 3 point bending test of FMLs. I have a problem that: Using student Mechnical solver: the outer Aluminum layer fail from the beginning. Using Open Radioss: failure does not occur at the beginning. I my opinion the results from Open Radioss is more resonable. Could you please help me explain this…
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Radioss optimization error
Hi, I'm trying to run an simple toy topography optimization problem in Radioss where a pressure is applied dynamically to a square plate (solid elements). When running the RADOPT file I receive the following error. How can I understand what is happening here? *** ERROR # 4306 *** No ESL is generated by SUBCASE 1 to do…
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What's the equivalent general type of contact for Axis symmetric Analysis in Radioss?
I am trying to run an axis symmetric analysis in Radioss. I am trying to find a type of contact similar to TYPE 7 contact, I want to use it for self contact. I tried TYPE 7 contact, however I got an error that it is incompatible with 2D analysis. I am trying to use TYPE 5 and TYPE 3, however I am getting this error: "ERROR…
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Modalling of Composit Materials
How do we model composit material Graphene in HYpermesh. To be more clear I would like to use Graphenee for some parts of automotive and Aerospace structures and would like to see the strength, Stiffness and Crash behaviour.
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/INTER/TYPE2 の結合力の合力の履歴出力を行う問題
始めに 本記事は、/INTER/TYPE2 の結合力の合力の履歴出力を行う例題です。 例題 ダウンロード: このような単純なモデルです。部品間は /INTER/TYPE2 でつないでいます。 結合条件を付けたいだけなら、上下のパーツを主サーフェスにして、真ん中のパーツを副節点集合にすれば、１個でできますが、結合力の集計値を出力したい場合は、本モデルのように、結合条件を、それぞれ分けます。 あとは /TH/INTER で、/INTER/TYPE2 の ID を指定してやれば、結合の合力が T01 ファイルに書き出されます。 こちらは FZ の履歴グラフです。きっちり 1000N 出ていることが分かります。
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Get DMG(Damage) contour in radioss
I have done an impact analysis on an aluminum plate . A steel ball impacts on the Al plate . Is there any way that i can plot DMG contour of the Aluminum plate?
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Smart Material Selection for Sheet Metal with Altair® Material Data Center™
Sheet metal plays a vital role across industries - from automotive body structures and aerospace panels to heavy engineering equipment, consumer electronics casings, and household appliances. Each application demands the right balance of strength, weight, and manufacturability, making material selection a critical step in…
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안녕하세요 Hypermesh-Radioss block을 통해 topology 진행 중에 있습니다.
Description: Topology optimize가 제대로 돌아갔는 지 아닌 지 잘 모르겠습니다. Product/Topic Name : hypermesh 2025 version. / Topology optimization *Note from Community Team - Hypermesh-Radioss block을 통해 topology를 진행하였고 compute console 에서도 에러 없이 해석은 완료되었다고 나왔습니다. 하지만 hyperview를 통해 결과를 확인하는 과정에서 contour의 드롭 다운 바에 element density 항목이 존재하지 않습니다.…
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Material encryption Process for Radioss solver using HyperMesh
The aim of this article is to demonstrate the steps involved for material (and properties) encryption with curves and failure using Altair HyperMesh version 2022.3 (New and Legacy). Applications Secure material testing data (stress-strain curves, failure limits) or knowledge (springs stiffness, etc.) The material laws can…
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topology 관련 오류 질문드립니다.Hypermesh 2025 Radioss, Optistruct
Description: 안녕하세요, 충돌최적화를 진행하고 있는 박진입니다. Hypermesh Radioss를 통해 충돌 해석을 진행하고, 이 결과를 바탕으로 topology로 optimize를 진행하고자 시도하고 있습니다. 위 사진과 같이 objectives를 질량을 최소화 하는 방향으로 정하고, constraints를 stress로 구간을 정해, topology 해석을 진행하였습니다. 충돌 해석을 진행 후 위 설정을 하여 저장된, .radopt 파일을 console solver에서 Run을 하였습니다. 그런데, 아래와 같은 error #1068 Missing ATTA…
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MPI 計算 (-np オプション) で、プロセスが一つのコアに集中してしまうときに試してみること
始めに どうやらいくつかの CPU で、Windows10/11 を使って Radioss を "-np" 付きで流した場合、複数のプロセスが、一つ（もしくは少数の）コアに集中して、計算が異常に遅くなることがあるようです。 本稿執筆時の私の認識では、Radioss のバグではありません。Radioss は複数のプロセスの MPI 計算を Interl MPI に委託するだけ（どのコアを使うとかは Radioss の指示ではない) で、Interl MPI がどのコアを使いたいか Windows10/11 に申し入れるのですが、どうも Windows10/11 がこの申し出を無視しているように見えております。 タスクマネージャを見てみましょう…
