Good morning all,
while I appreciate that WDRT is no longer being developed, I would still try to share a doubt I have related to the fatigue calculation example in example_fatigue.py.

My doubt is related to how the 1-year DEL is calculated - starting from the 1-hour DELs.

In line 40 of the code, you sum up the contributions to the 1-year DEL as:

    Feq_1y = Feq_1y + (Feq_1h[i][j]**m) * N1h * P[i][j]

where N1h is the average number of cycles in 1 hour. I wonder why you don't multiply this by 24 * 365, which is the number of hours in one year, to get the 1-year damage contribution of Feq_1h[i][j].

I came across this doubt when looking at the DEL of 1.04 MN you calculate in the example, which looks a bit low - in 8 out of 9 cells of the scatter diagram (75% of occurrences), the 1-hour DEL is higher than the calculated DEL, which makes me think that the 1-year DEL should be somehow larger than 1.04 MN.

Thanks in advance for your patience and kindness.

Best regards
Michele Martini