SimCafe

Space shortcuts

Child pages
  • Modal Analysis of a Composite Monocoque - Mesh
  • Created by user-ac6d9, last modified by user-0108f on Aug 15, 2015

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 24 Current »

Author: Jingsi Wu, Cornell University

Problem Specification
1. Pre-Analysis & Start-Up
2. Geometry
3. Mesh
4. Physics Setup
5. Numerical Solution
6. Numerical Results
7. Verification & Validation
Exercises
Comments

Mesh

Material Properties

The material properties for composite materials are different than typical isotropic materials, because some material properties depend on direction. Also, monocoque typically have a sandwich structure consisting of carbon fiber layups surrounding an aluminum core. The following steps show how to enter orthotropic properties into ANSYS.

T300 Weave

Double click  Engineering Data 

Add a new material by click into the text box, and name the material "T300 weave". This will be the properties of one ply made up of a T300 carbon fiber weave mat infused with an epoxy resin in a pre-impregnated form. 

To enter an orthotropic material property, go to  Linear Elastic  > (Drag) Orthotropic Elasticity onto the new material. A lists of property information will appear in the Property Outline as shown below:

Here are the corresponding properties for this material:

Ex = 8.5E6 psi
Ey = 8.5E6 psi
Ez = 1E6 psi
Vxy = 0.06
Vyz = 0.06
Vxz = 0.06
Gxy = 5.6E5 psi
Gyz = 5.6E5 psi
Gxz = 8.3E5 psi

This type of composite is weaved, so you have to define that as well, go to  Physical Properties  > (Drag) Density and Ply Type on to the new material. Enter 0.057 lb/in^3 for the density. Also, expand ply type and select  Woven  from the pull down menu.

Next step, we need to define the stress limits and Tsai-Wu constants for failure analysis. Expand  Strength > (Drag) Orthotropic Stress Limits and Tsai-Wu Constants on to the new material.  Enter the property values that are shown below:

5250 Core

Enter the properties for the 5250 Core as was done for the the weave. The values are displayed in the figure below:

Suspension links are normal isotropic materials. It has purposely been made to be really stiff, so that the deformation of the monocoque can be seen more clearly. Here are the properties to use for structural steel:

Attach the Suspension Link & Mesh

The following video shows how to mesh the composite material and how to attach line bodies to surfaces.



Go to Step 4: Physics Setup

Go to all ANSYS Learning Modules

  • No labels