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Modeling 3-Point Bending Test of Sandwich Panel: OptiStruct or Radioss?
Hello everyone, I am working on a FE simulation of a 3-point bending test on a sandwich panel using HyperMesh 2025.1. Model Details: Components: Top and bottom face sheets + different types of core formats Material: All metallic parts. Interface: The face sheets are bonded to the core crests using a resin layer.…
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Low absorbed energy in composite crash simulation
Hi guys! I'm running a crash simulation of a composite Impact Attenuator, and I got the simulation to run with, what looks to me, good contact interaction and composite failure mode. The problem is the energy absorbed during the crush, It's too low. At the beggining i thought the problem might be an inconsistency in the…
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Exterior acoustic simulation of Motor to predict SPL using Surface velocity data a input?
Hi, I have a surface velocity data of E-motor/Engine generated by third party MBD solver in .pch file format. I would like to use this data as a excitation to predict the exterior noise at 1m distance microphones. I have looked at the documentation of IE, RADSND & APML methods in optistruct. Surface velocity required for…
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Radioss error message
Any help will be welcome. I kept getting the error attached. My computer storage is okay and i have deleted unwanted files just in case. Thanks
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Radioss跌落仿真，四面体单元的设置建议。
200mm直径的离心风扇跌落仿真，使用四面体网格建模，四面体单元属性应该如何设置更准确
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Radioss SPR Simulation: Unexpected Material Failure and Punch-Through Issues
Hi everyone, I am working on a Self-Piercing Riveting (SPR) process simulation using Altair Radioss (HyperMesh for pre-processing). I am experiencing an issue where the rivet (36MnB4) punches through the top sheet (Al5182) without proper penetration and interlock formation. Instead of the rivet flaring out and creating a…
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Is it possible to modify the torsional stiffness (k) of a Rigid Body or RBE (Rigid Body Element)?
Hello everyone, I am working on simplifying a transmission model to optimize calculation times. I have extracted a sector composed of two teeth belonging to their respective crowns. Currently, I have linked the lateral and internal faces of the teeth to a Rigid Body connected to the center of the crown. However, this…
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PhysicsAI ignores impact velocity but detects geometry variation
Hello, I have a problem regarding PhysicsAI. I have a crash tube model that is being deformed, and I would like it to generate reasonably reliable predictions for varying radii and impact velocities. I created a dataset with different radii and, for each radius, two different impact velocities (8 m/s and 5 m/s). So far,…
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Drop Simulation
Description: Kindly add description here Product/Topic Name : Kindly include the product name, version if applicable here. Also, Don't forget to tag with the product/topic related to your question. *Note from Community Team - Once you receive a satisfactory answer on your question, kindly mark your answers as "Accepted" so…
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Radioss RWALL constrain axis
Hi Is there a way in Radioss to constrain the RWALL in say all DOF except x? I would typically use /BCS/ , but unsure how to define the set with the RWALL- any help would be greatly appreciated- thanks! /RWALL/PARAL/1 #rwall_title RIGID_WALL # node_ID Slide grnd_ID1 grnd_ID2 1295724 2 0 0 # Dsearch fric phi ifq 200.0 0.2…
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Radioss RWALL velocity time history
Hi , I have a rigid wall with velocity and mass (see below) - is it possible to extract the time history (velocity, displacement etc.) of the rwall? My understanding is only force is output from the TH/RWALL but I would prefer to be able to plot the velocity without performing math functions on the force curves. Thanks !…
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Radioss thermoplastic polimers material card at different strain rate
Hello, what is a material card for Radioss explicit solver if I have a thermoplastic polimer (for ex. PA6+30GF) at different strain rate? As you know the elastic modulus change from quasi-static tensile to higher strain rate, in fact increase.. due to increase the stiffness of the material if I stretch at high velocity. Is…
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[URGENT] RADIOSS SDK Error: /MAT/USER01 Routine Not Found in DLL (Shell Law)
Issue Description: > I am encountering a termination error in the RADIOSS Starter when attempting to use a custom material law (/MAT/USER01). Despite having the compiled DLL in the working directory and specifying it in the solver console, the solver fails to find the user interface routine. Error Log: > ** ERROR IN USER…
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Radioss で摩擦を熱に変える例題
はじめに Radioss の接触 /INTER/TYPE7 と /INTER/TYPE25 には、摩擦エネルギを、熱エネルギに変換して、熱伝導解析の熱源とすることができます。 本記事では、簡単な例題を一つ示しながら、入力内容について説明していきます。 例題と説明 ダウンロード: 摩擦で熱が発生している様子。 本例題は、こちらの公式例題を元に作りました。 https://help.altair.com/hwsolvers/rad/topics/solvers/rad/thermal_analysis_example_r.htm この例題は、摩擦を熱には変えませんが、接触による熱伝達 (/INTER/TYPE7 内で設定) と、その熱伝導…
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Issue passing data from Starter (USERWIS) to Engine (USERWI) in custom interface
Hi I am trying to use a custom subroutine to calculate a custom contact interface between two objects I have an issue connecting the starter and the engine runs. In the starter run, im assigning the memory allocation (USERWIS_INI) and values (USERWIS) for IUVAR and UVAR while maintining all other values as Radioss assigned…
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/FAIL/ENERGY を使って、要素の内部エネルギ密度で要素を削除する例題
はじめに タイトルには、内部エネルギ密度と書きましたが、特に難しいことではなく、応力ーひずみ線図の塗りつぶす面積のことです。 /FAIL/ENERGY のリファレンスより抜粋。 ゴムやスポンジなどの、超弾性、粘弾性材料には、材料自体に破断基準がないため、要素を削除するには、何か追加で必要になるわけですが、/FAIL/ENERGY はわかりやすい部類に入ると思います。 例題は、最初に、/FAIL/ENERGY を使わずに応力ーひずみ線図を取得して、そこから破断させるエネルギの値を求め、その次に、/FAIL/ENERGY を与えて破断させる、という流れです。 カードの説明 必須項目は E1, E2 のみです。例題でも、この 2個だけ使います。…
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/LOAD/PFLUID で簡易的に空気抵抗を模擬する例題
はじめに Radioss でまじめに空気抵抗を模擬しようと思うと、流体構造連成解析が必要になります。ただ、そこまでモデルを複雑にしたくなくて、速度の二乗に比例するようなものを簡易的につけるだけでいいです、という場合は、/LOAD/PFLUID が利用できます。 本記事では例題を一つ示します。 空気抵抗を模擬する場合の /LOAD/PFLUID の設定方法 /LOAD/PFLUID 自体は、下の式で表されるように、圧力と速度の2乗に比例する抵抗を考慮できます。しかし空気の場合、構造に影響を及ぼすほど有意な差が空気圧に出るほどの巨大な構造物は、まずないと思いますので、この左の項は、無視して、右の項だけ使います。…
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接触した後、離れにくくする 3個の例題
はじめに Radioss では、接触した後、離れにくくするような手法が 3通りあります。この記事では、それぞれの手法ごとに、例題を提示します。 例題1, VISs による粘着性の表現 ダウンロード: 例題では /INTER/TYPE25 を使っていますが、TYPE7, 11, 24 にも同じオプションがあります。この方法の利点は、どの接触タイプでも利用できることです。 使うのはこのオプションです。実は安定性も加味して、デフォルトで 0.05 が入っているため、知らず知らずのうちに使っています。 働きとしては、接触領域に侵入した節点に対して、移動方向とは別の向きの力を発生します。要は粘性力ですので Viscosity から VIS を取って…
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RADIOSS ALE corner cells with non reflective boundary
In hypermesh how do you create these corner cells which wrap around. The following screenshot is from the Radioss example files for ALE cases to satisfy the condition where the nonreflective boundary condition must have at least one face in contact with a fluid material. I.e. iform=6 when using multi material law51. From…
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Conducting a Contact Simulation With a Composite Using the Radioss Solver?
Hello Altair community, I'm currently conducting experimental composite simulations in Hypermesh with the Radioss solver with the ultimate goal of replicating a 3 point bend test. My goal is to visualize the failure of the composite and get results similar to my actual conducted 3 point bend test. I am currently using…
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User defined Material assign Temperature in dll
Hi, I am implementing a temperature-dependent shell material in Radioss UMAT via dll. In sigpc29c, is the TEMP(NEL) array read-only? If I calculate a temperature increase from plastic work, can I write it back to TEMP(i), or must I store it in UVAR to ensure it persists? Does the solver automatically pass the nodal…
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/FUNCT_PYTHON をバネ要素特性に適用する例題
はじめに v2026 から /FUNCT_PYTHON をバネ要素プロパティに適用できるようになりました。 本記事では /PROP/TYPE25 (/PROP/SPR_AXI) に適用する例題を示します。 なお、Python やコードの中身については説明はしません。委託を希望する場合は、担当営業にお申し出ください。 例題 ダウンロード HyperMesh 2026 でも /FUNCT_PYTHON に未対応なので、読み込んで吐き出すと壊れます。上書きしないなど、取扱に注意してください。 この例題ではバネを押し込むことで、板を回してみます。 Radioss…
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Significant Differences Between RADIOSS and ANSYS AUTODYN Blast Results – Seeking Expert Opinions
Overview: Hello everyone, I am currently performing numerical simulations of explosion in air using both Altair RADIOSS and ANSYS AUTODYN, and I am observing significant discrepancies in pressure results between the two solvers, despite using nominally identical input parameters. I would greatly appreciate insights from…
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Example: Find difference between CAD and 3D scanned grids by Radioss.
Introduction This is English translation of this article. HyperMesh and MVD (Model Verification Director) provide shape-comparison functionality. Thus, we can compare CAD and FEM. However, comparison between grids and CAD/FEM are not supported. I considered how I can compare them. And finally, I realized that Radioss have…
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Composite post-process in Radioss
Hi, I am currently working with dynamic analysis with composites in radioss and I was wondering if, as in optistruct, there was a way to visualize contours such as 'cstress', 'cfailure' or 'cstrain'. I have seen that there is an option to visualize the Tsai-Wu criterion, but I was wondering if there was the other…