Tensile modulus, principal direction results

The Tensile modulus, principle direction results indicate how much stress is needed to cause a unit of movement.

This help topic covers the following Fiber orientation Pack analysis results:

• Tensile modulus in first principal direction
• Tensile modulus in second principal direction

Using these results

The Tensile modulus in first and second principal direction results are recorded for each laminate in the model over the duration of the analysis. Therefore, each laminate in the model will have different results. You can check the tensile modulus in each laminate by animating the default contour plot, which will animate the result over the Normalized thickness.

The first principal direction coincides with the fiber orientation first principal direction, and is determined by the Fiber orientation analysis. The second principal direction is perpendicular to the first principal direction.

Tip: You can view the contour plot at a single laminate on the model. To do so, click Results tab > Properties panel > Plot Properties. The Plot properties dialog opens. Select the Animation tab, and from the Animate result over drop-down list, select Single dataset.

Tip: Click Results tab > Plots panel > New Plot and under Plot type, click XY plot or Path plot, so that you can view the tensile modulus in the first or second principal direction at a particular element.

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 Midplane/Dual Domain models, because of the plain stress assumption in the shell structure analysis in warpage, 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 Home 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.