ðɪ ᵻkwˈeɪʒən ɪz ᵻsˈɛnʃəli ɐsˈuːmɪŋ ðɪ ᵻlˈæstɪk stɹˈeɪn pˈoːɹʃən ʌvðə stɹˈɛsstɹˈeɪn kˈɜːv, , kæn biː mˈɑːdəld wɪð ɐ lˈaɪn, wˌaɪl ðə plˈæstɪk pˈoːɹʃən, , kæn biː mˈɑːdəlɪŋ wɪð ɐ pˈaʊɚ lˈɔː.
The equation is essentially assuming the elastic strain portion of the stress-strain curve, , can be modeled with a line, while the plastic portion, , can be modeling with a power law.