Poisson’s ratio (fiber) result

The Poisson’s ratio (fiber) result is a fiber-over-thickness (FOT) averaged value, therefore, it is an element-based value averaged over all the laminates of each element.

This result is generated from a Fiber orientation Pack analysis.

Using this result

The Poisson’s Ratio (fiber) result indicates the average strain in the second principal direction caused by the stress in the first principal direction.

The Poisson’s ratio, (v12) result is a laminate-based value, therefore, you can view the Poisson’s ratio distribution for each laminate in the model. You can check this result for more detailed information on the Poisson’s ratio distribution.

Poisson’s ratios are mechanical property values. The distribution of this mechanical property is used by the structural analysis for its performance evaluation in a Stress analysis.

Orthotropic assumption

The thermo-mechanical property calculation for fiber-filled composites are based on the orthotropic assumption, that fiber-filled material properties are different in three orthogonal principal directions. Under this assumption, there are 9 independent mechanical constants and three independent thermal expansion coefficients. In models analysed using Midplane or Dual Domain analysis technologies, because of the plain stress assumption in the shell structure analysis in Warp, only 4 mechanical constants (tensile modulus in first/second principal directions, Poisson ratio v12, shear modulus G12) are necessary.

The Orthotropic set option selects the 9 mechanical constants (E1, E2, E3, v12, v23, v13, G12, G23, G13) and 3 CTE’s (thermal expansion coefficient in first/second/third directions) all at once.
Note: To access the Orthotropic set option ensure you have selected an analysis sequence that includes Fill+Pack.
  1. Click Process SettingsHome tab > Molding Process Setup panel > Process Settings. The Process Settings Wizard dialog opens.
  2. If necessary, click Next until you reach the Fill+Pack Settings page of the Wizard.
  3. Select the option Fiber orientation analysis if fiber material, and then click Fiber parameters. The Fiber Orientation Solver Parameters dialog opens
  4. Click Composite property calculation options, and then from the Fiber-filled property output drop-down list, select Orthotropic set.
Parent topic: Fiber Orientation analysis results