0
$\begingroup$

$$ \text{Ramberg-Osgood equation:} \hspace{41mm} \varepsilon_{tot} = \underbrace{\frac{\sigma}{E}}_{\text{elastic}} + \underbrace{\left(\frac{\sigma}{K}\right)^{\frac{1}{n}}}_{\text{plastic}}$$ $$ \text{Coffin-Manson equation:} \hspace{46mm} \varepsilon_{tot} = \underbrace{\frac{\sigma_f}{E}\left(2N_f\right)^b}_{\text{elastic}} + \underbrace{\varepsilon_f\left(2N_f\right)^c}_{\text{plastic}}$$ I was wondering about a situation where the cycles were not of constant stress/strain and not given by a SN curve or strain life diagram. How do you get the ultimate tensile strength after a number of cycles with changing stress and strain at each cycle?

$\endgroup$
  • $\begingroup$ That makes it quite difficult, particularly since fatigue failure is statistical to begin with. $\endgroup$ – Jon Custer Aug 18 at 14:05

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.