ðə ɹˈæmbɜːɡ ˈɑːsɡʊd ᵻkwˈeɪʒən wʌz kɹiːˈeɪɾᵻd tə dᵻskɹˈaɪb ðə nˈɑːn lˈɪnɪɹ ɹᵻlˈeɪʃənʃˌɪp bᵻtwˌiːn stɹˈɛs ænd stɹˈeɪn—ðæt ˈɪz, ðə stɹˈɛs stɹˈeɪn kˈɜːv—ɪn mətˈɪɹiəlz nˌɪɹ ðɛɹ jˈiːld pˈɔɪnts.
The Ramberg–Osgood equation was created to describe the non linear relationship between stress and strain—that is, the stress–strain curve—in materials near their yield points.