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Exact(4)
At load ratio R = 0.5, the mean damage sum is approximately 0.1 in the VHCF regime.
Linear damage accumulation calculation delivers mean damage sum S = 0.44 in experiments with mean lifetimes below 4 × 107 cycles.
For load ratio R = 0.1, the mean damage sum decreases from 1.1 to 0.2 when lifetimes increase from HCF to VHCF.
For load ratio R = −1, the mean damage sum decreases from 0.5 to 0.3 when lifetimes increase from the HCF regime to 109 cycles, and increases at higher numbers of cycles.
Similar(55)
However, facilitating a lightweight component design by considering experimental test results of HFMI-treated joints under CAL, a reduced specified damage sum of D = 0.3, or even of D = 0.2 in case of fluctuating mean stress states, is suggested for the fatigue assessment to avoid non-conservative results.
Emissions now mean damage later, making it tempting to stall.
This would mean damage amounting to about $4.5 billion.
Here, the theoretical Palmgren Miner-damage sum Dth = 1.0 is still suggested as the allowable damage sum Dal desPalmgren Miner-damageisumamage sum renDths unsafe calculated fatigue lives in about 90% of all published results.
This approach results in the total damage sum of the spectrum Dspec.
The mean damage degree is computed based on the discrete probabilities associated to each damage state.
For fatigue life calculations the real damage sum Dreal=0.3 is suggested.
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