11.12. Strength

The following table summarizes the applicable strength-limit constants for each failure criterion:

Strength Limit Constant

Orthotropic Stress Limit

Orthotropic Strain Limit

Tsai-Wu Constants

Tensile X-Direction

Y

Y

Y

Tensile Y-Direction

Y

Y

Y

Tensile Z-Direction

Y

Y

 

Compressive X

  

Y

Compressive Y

  

Y

Compressive Z

   

Shear XY

Y

Y

Y

Shear YZ

Y

Y

 

Shear XZ

Y

Y

 

Coupling Coefficient XY

   

Coupling Coefficient YZ

   

Coupling Coefficient XZ

   

Tsai-Wu Constants must be used in conjunction with Orthotropic Stress Limit. Tsai-Wu Constants used in conjunction with Orthotropic Strain Limit are not supported.

The TSai-Wu coefficients are always reset to -1 in an Explicit solve. The Tsai-Wu Constants property changes how the Explicit Dynamics solver uses the data from the Orthotropic Stress Limit property. Without the Tsai-Wu Constants property, the Explicit Dynamics solver uses all three tensile stress and all three shear stress constants from the Orthotropic Stress Limit. With the Tsai-Wu Constants property, the Explicit Dynamics solver uses the tensile and compressive stress constants in the X and Y direction only (not Z) and the XY shear stress constant (not YZ and XZ shears).