Relationship between time to reach Monkman-Grant ductility and rupture life

Based on continuum creep damage mechanics approach, we propose a new relationship between time to reach Monkman-Grant ductility and rupture life in terms of damage tolerance factor, and show the validity of this relationship for creep data on 9Cr-1Mo steel and AISI 304 stainless steel. Its implications to tertiary creep damage and engineering creep design are also discussed in this paper