Woven Fatigue Tab

If the woven material being created is to be used in a fatigue analysis, fatigue data must be entered in the Fatigue tab.

fatigue tab

Q - Fatigue Data

This field contains experimental lamina fatigue data which are S-N data points. An S-N data point contains the following information:

This data is used to optimize material fatigue constants used in a Helius PFA fatigue analysis. At least two data points are required to perform the optimization.

Suppose the data below is provided as experimentally measured fatigue data. This data would be entered into the GUI as shown below:

woven data

A Note on Material Strengths

You must provide the out of plane shear strength (S23) when creating a material for use with Helius PFA. A good approximate value if no experimental value exists is 5.0E+7 Pascals. The equation below can also be used as an estimate for S23:

s23

where S22Tension is the transverse tensile strength and S22Compression is the transverse compressive strength.