Hi Kiana,
This error message ' Invalid or missing stress life curve.' may be issued if the material you use does not have an SN curve. Please see if the following link is of help to you:
https://www.researchgate.net/publication/313884920_Fatigue_Properties_of_Plain_Concrete_under_Triaxial_Tension-Compression-Compression_Cyclic_Loading
Regards,
Ashish Khemka
You are navigating away from the AIS Discovery experience