fatigue - hand calculation help needed
fatigue - hand calculation help needed
(OP)
I'm trying to determine the endurance limit of a cylindrical cantilever beam (e.g. cylinder attached to a wall). Question: if I apply a load to it over and over again, will it eventually fail? Is there a simply engineering hand calculation that can be done to solve this? Thanks






RE: fatigue - hand calculation help needed
RE: fatigue - hand calculation help needed
RE: fatigue - hand calculation help needed
I don't have either of the manuals. Is the table public information? Let me know if you can help further. Thanks.
RE: fatigue - hand calculation help needed
RE: fatigue - hand calculation help needed
RE: fatigue - hand calculation help needed
RE: fatigue - hand calculation help needed
RE: fatigue - hand calculation help needed
To quote an unnamed online reference: "The number of cycles that a metal can endure before it breaks is a complex function of the static and cyclic stress values, the alloy, heat-treatment and surface condition of the material, the hardness profile of the material, impurities in the material, the type of load applied, the operating temperature, and several other factors."
As a general rule, designers usually have little concern for fatigue in carbon steels until the stress reaches about half of yield (or half of ultimate for some designers and materials). The best course of action may be to keep the stress level lower than half of yield, (or possibly as high as 45% of ultimate) to avoid fatigue issues.
RE: fatigue - hand calculation help needed
And yes, if it is under such stresses, it will fail eventually.
Out of that, it would be just guessing. Wohler curves are hardly applied on real life projects as it only true to the components tested and not a material behavior. Neither of the prior alternatives are simple neither they are cheap.