Ansys Employee
Fatigue data for some commonly used materials is readily known and is available in different material handbooks. For new alloys test data may be hard to find and testing might be required to get the curve. Here are a few material handbooks https://books.google.co.in/books?, https://core.ac.uk/download/pdf/193245191.pdf and https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1460-2695.1990.tb00594.x.
Regards Ishan.