Derivation of novel creep-integrated fatigue equations. (November 2019)

• Record Type: Journal Article
• Authors: Wong, E.H.
• Is Part Of: International journal of fatigue. Volume 128(2019)
• Publication Date: 2019-11
• Subjects: Creep -- Creep fatigue -- Environmental fatigue -- Solder -- Stainless steel; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2019.06.044
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: A novel model that integrates creep damage into fatigue. Embedded creep damage is formulated from the constitutive equation of creep. Capable of modelling creep fatigue from pure creep to pure fatigue. Fundamentally sound, easy to use, valid over wide range of creep fatigue conditions. Validated using two metals of vastly different creep and fatigue characteristics. Abstract: This manuscript presents a systematic derivation of novel creep-integrated fatigue equations that possess the following unique characteristics: (i) creep damage and creep-fatigue interaction damage are embedded into the fatigue equation and requires no deliberate computation; (ii) the embedded creep damage is formulated from the constitutive equation of creep; and (iii) the integrated equation is capable of modelling the full range of creep fatigue from pure creep to pure fatigue. These characteristics ensure that these creep-integrated fatigue equations are fundamentally sound, easy to use, and applicable over a wide range of creep fatigue conditions. The creep-integrated fatigue equations based on three constitutive equations of steady-state creep: Dorn equation, Larson-Miller equation, and Manson-Haferd equation are derived and successfully validated using two metals of vastly different creep and fatigue characteristics – the SS316 stainless steel and the Sn37Pb solder.