Best Of

Re: Impact fatigue

Hello,

The recommended values for shell element properties are the ones that you have inserted already.

As for the material, it is suggested to use /MAT/LAW2 instead of /MAT/LAW1, because it can produce more accurate stress distribution through the thickness. To use this law for elastic only material you have to set the Yield Stress equal to a high value that is not reached (1e+30 is proposed). /MAT/LAW1 uses global integration only, one integration point, which is less accurate.

Finally, you can use thick shell elements, which are preferred for higher accuracy in stress distribution through thickness. When you use Thick Solid elements it is recommended to insert the /H3D/NODA/GPS and /H3D/NODA/GPSTRAIN engine file outputs that will let you see the results for stress and strain in the outer nodes (that might be higher).

Additionally, you must be careful with the results you display. For example, different Averaging Methods in Contours can include or not the precise values on nodes and may give only an average value. In the following images you can see the same element contour without and with an Averaging Method. This can lead to a change in the displayed maximum value (see images).

Polyvios Romanidis

1

包絡線の抽出

Overview

Altair Twin Activateで実施した1Dシミュレーションの結果に対し、包絡線を抽出します。

Pre-Requisite

本記事で使用したサンプルモデルはこちらよりダウンロードいただけます。

Usage/Installation Instructions

包絡線の抽出はリアルタイムでは行えませんので、包絡線の抽出を行いたいデータをSignal Outブロックを用いて、OMLの変数として書き出します。

モデルの最終化を用いることで、Twin Activateのシミュレーション後、Open Matrix Language (OML)を用いたポスト処理が行えます。

包絡線の抽出にはヒルベルト変換を用います。残念ながら、標準関数には含まれませんので、functionで関数を定義しています。

y=hilbert(x)

でxに対し、抽出した包絡線をyに格納します。

あとは、Signal Outブロックで取り出したOML変数outに対し、時間軸tとカーブデータsを取り出し、hilbert関数で抽出した包絡線をzに格納し、プロットしています。

シミュレーションを実行すると、1Dシミュレーションとその後の最終化のスクリプトが自動で実行され、包絡線を抽出したグラフが表示されます。

Post-Requisite

使用製品：Altair Twin Activate

よくあるエンジニアからの質問はこちら

Kosuke_IKEDA

1

Re: How to pass a variable to a different device in CUDA Code?

Hi,

Custom properties with the same name are the same custom property. By that I mean if you want to access your 'Force' custom property, that you have defined in your contact model, in a particle body force, then you simply need to setup the custom property again for a body force plugin. So if it's called "myForce" in the .cpp, register it again for a PBF plugin, access whatever the correct index is in externalForce( ) in the .cu file and use the value there.

Cheers,

Richard

RWood

1

Re: How does S-LINE calculate TOP and BOT longitudinal bar spacing?

Hello Angelica, thank you for your comment.

Before answering, I must ask which standard you compare your hand calculations to.

S-LINE has different ways of the longitudinal spacing for bars depending on the code selected, find a short description of them below:

For ACI

For BS8110 and CP65

And CSA

As you can see, the method varies slightly from code to code, however, I hope that with this information you can compare accordingly to your calculations and your question is answered.

Best regards,

Tayen Aguilar

Tayen_Aguilar_57

1

Re: Feature Importance for Regression Random Forest

Hi @omohsen

I would recommend having a look at the interpretations extension, see: https://community.rapidminer.com/discussion/58471/new-extension-interpretations-shap-lime-and-shapely

Please let me know how you get on.

Best,
Roland

RolandJones

1

Re: How does S-LINE calculate TOP and BOT longitudinal bar spacing?

Thanks Tayen, I'm comparing with CSA.

Do you have any more insight into how S-LINE calculates the actual bar spacing it compares to the CSA code?

Hi Angelica, I would advise you to check S-LINE's help system, got to Help-->Content and you will find the Topics dialogue where you can type in the topic that you need more information about and look at the different topics, like the CSA provisions, where I got the screenshot I shared earlier.

If you have any additional questions, please be welcome to send them as a case to hwsupport@altair.com along with any models you would like us to look at.

Best,

Tayen Aguilar

Tayen_Aguilar_57

1