When I apply a 63 degree temperature load on a certain plastic, and I linked the study to a fatigue study which gave me a life of 7.742 *10^8 cycles. First of all, how to know the lifetime in days for this cycle? Second, I tried to find the temperature variation through the day of the plastic by flow simulation and was successful. I tried this time linking a fatigue analysis to a non linear study with a temperature load varying with time through out the day according to the graph I obtained from the flow simulation. When running the non-linear study, the plastic failed directly and the fatigue gave high damage and a life of 1.955*10^3 cycles, which totally does not match the constant load.
The study is attached in this question, the Static study is the one with a constant 63 degree load, and linked to Fatigue 1, and fatigue 2 is linked to the non-linear study.
It is urgent to find help regarding this matter, and I hope someone can help me fast.