ˌɪntɹədˈuːsɪŋ ðə jˈiːld stɹˈɛŋθ ʌvðə mətˈɪɹiəl, , ænd dᵻfˈaɪnɪŋ ɐ nˈuː pɚɹˈæmɪɾɚ, , ɹᵻlˈeɪɾᵻd tʊ æz , ɪɾ ɪz kənvˈiːnɪənt tə ɹᵻɹˈaɪt ðə tˈɜːm ɔnðɪ ɛkstɹˈiːm ɹˈaɪt sˈaɪd æz fˈɑːloʊz:
Introducing the yield strength of the material, , and defining a new parameter, , related to  as , it is convenient to rewrite the term on the extreme right side as follows: