# Exercise 1: Define Model Data for the Head and A-Pillar Impact Analysis

In this exercise, you will become familiar with defining LS-DYNA materials, sections, and parts in Engineering Solutions. Also, you will set up model data for a LS-DYNA analysis of a hybrid III dummy head impacting on A-pillar.

The head and A-pillar are depicted in Figure 1.

## Load the LS-DYNA User Profile

In this step, you will load the LS-DYNA user profile in Engineering Solutions.

1. Start Engineering Solutions Desktop.
2. In the User Profile dialog, set the user profile to LsDyna.

## Retrieve the Engineering Solutions File

In this step, you will open the Engineering Solutions model file.

1. Open a model file by completing one of the following options:
• Click File > Open > Model from the menu bar.
• Click on the Standard toolbar.
2. In the Open Model dialog, open the head_start.hm file.
The model appears in the graphics area.

## Define the *MAT_ELASTIC Material

In this step, you will define a new material for the A-pillar and head.

1. In the Solver Browser, right-click and select Create > *MAT > MAT(1-50) > 1 -*MAT_ELASTIC from the context menu.
Engineering Solutions creates and opens a new material in the Entity Editor.
2. For Name, enter ELASTIC.
3. For Rho (Density), enter 1.2E-6.
4. For E (Young's modulus), enter 210.
5. For PR (Poisson's ratio), enter 0.26.

## Define *SECTION_SHELL

In this step, you will define a property with a 3.5 mm thickness for the A-pillar.

1. In the Solver Browser, right-click and select Create > *SECTION > *SECTION_SHELL from the context menu.
Engineering Solutions creates and opens a new property in the Entity Editor.
2. For Name, enter section3.5.
3. For card image, select SectShll.
4. Expand NonUniformThickness, and enter 3.5 for T1.

## Define *SECTION_SOLID for the Head

In this step, you will define *SECTION_SOLID for the head of the model.

1. In the Solver Browser, right-click and select Create > *SECTION > *SECTION_SOLID from the context menu.
Engineering Solutions creates and opens a new property in the Entity Editor.
2. For Name, enter solid.

## Define *PART for the A-pillar

In this step, you will define the *PART for the A-pillar in the model.

MAT_ELASTIC is the material collector named "ELASTIC." *SECTION_SHELL is the property collector named "section3.5."
1. In the Component folder of the Model Browser, click pillar.
The Entity Editor opens, and displays the component's corresponding data.
2. Set card image to Part.
3. For Material, click Unspecified > Material.
4. In the Select Material dialog, select ELASTIC and then click OK.
Engineering Solutions assigns the material Elastic to the component pillar.
5. For Property, click Unspecified > Property.
6. In the Select Property dialog, select section3.5 and then click OK.
Engineering Solutions assigns the property section3.5 to the pillar component.

## Define *PART for the Head

In this step, you will define the *PART for the head of the model.

*MAT_ELASTIC is the material collector named "ELASTIC." *SECTION_SOLID is the property collector named "solid."
1. In the Component folder of the Model Browser, click head.
The Entity Editor opens, and displays the component's corresponding data.
2. Set card image to Part.
3. Set Material to ELASTIC.
4. Set Property to solid.

## Save Your Work

In this step, you will save your work.

Save your work as a Engineering Solutions file named head_2.hm.