エンジニアリングデータ内の直交異方性応力限界について

[yuu0910]

エンジニアリングデータにて材料特性を設定する際に、ツールボックスの強度の欄にある直交異方性応力限界という設定項目があります。

スクリーンショットにあるそれぞれの材料特性はどのような基準で設定すればいいのでしょうか

マニュアルを探しましたが直交異方性応力限界に関する記載を見つけることができませんでした。

教えていただけると幸いです。

よろしくお願いいたします。

[Armin]

Hello,

The Orthotropic Stress Limits in Engineering Data allow users to define the allowable stress values in the three principal material directions, as well as the allowable shear stress in the material. This is primary applicable to composite materials and in the forum post below you can see an example of such an application:

https://innovationspace.ansys.com/forum/forums/topic/missing-input-fileds-in-workbench/

[yuu0910]

Thank you for letting me know.
I understand that it is mainly used for composite materials, but can I set it for wood material properties as well?
In LS-DYNA, I cannot set strength-related settings such as tensile yield strength, so how should I set it?

[Armin]

No problem at all.

I checked the Workbench LS-DYNA (2024R2) and when the "Orthotropic Stress Limit" is selected in the Engineering Data application, no keyword file is written in the input file to reflect this selection. So my suggestion is to use one of the options under the Failure branch (screenshot below) such as the Principal Stress Failure where you can input the stress at failure and as a result, the *MAT_ADD_ EROSION card is automatically written to the input file that will consider failure. If your material is composite and needs to consider direction-dependency, select one of the composites models under the LSDYNA External Model - MAT branch (screen shot below) such as the *MAT_COMPOSITE_FAILURE_SOLID model.
I'm a bit confused about your point of setting the yield stress but if your material is ductile like a metal and shows plastic deformation, you can look into one of the options under the "Plasticity" branch.

[yuu0910]

Thank you for your reply.
I was also considering setting principal stress fracture as an option.
I asked the question because analysis systems other than LS-DYNA display items for setting things like yield tensile strength.
Does this mean that those items are not supported in LS-DYNA?
Below is a screenshot of the strength items that are displayed when setting only engineering data from Workbench.

[Armin]

You are right.
When using LS-DYNA in the workbench, it is recommended to first insert the LS-DYNA analysis system to the Project Schematic and then open Engineering Data. This way only filtered material models supported by the LS-DYNA solver will be shown.

[yuu0910]

Thank you.
I would like to select material properties within the range supported by LS-DYNA and proceed with the analysis.