scholarly journals AN INVESTIGATION OF THE CREEP-FATIGUE-ENVIRONMENT INTERACTION IN A Ni-BASE SUPERALLOY

1979 ◽  
Vol 2 (4) ◽  
pp. 401-412 ◽  
Author(s):  
S. FLOREEN ◽  
R. H. KANE
Keyword(s):  
Environment Interaction ◽  
Creep Fatigue ◽  
Base Superalloy

An Integrated Creep-Fatigue Theory for Material Damage Modeling

2014 ◽  
Vol 627 ◽  
pp. 341-344 ◽  
Author(s):  
Xi Jia Wu
Keyword(s):  
Damage Evolution ◽  
Crack Nucleation ◽  
Low Cycle Fatigue ◽  
Damage Evolution Equation ◽  
Physical Mechanisms ◽  
Subsurface Cracks ◽  
Wide Range ◽  
Creep Fatigue ◽  
Cobalt Base ◽  
Base Superalloy

This paper presents an integrated creep-fatigue (ICF) theory to describe the non-linear creep-fatigue interaction during thermomechanical loading. The ICF theory recognizes the damage evolution as a holistic process consisting of nucleation and propagation of surface or subsurface cracks in coalescence with internally distributed damage, leading to final fracture. In a polycrystalline material under combined cyclic and dwell loading, crack nucleation and propagation occurs by fatigue or oxidation mechanisms, whereas internally distributed damage often occurs in the form of grain boundary cavities or microcracks due to creep or dwell effects, particularly at high temperatures. Based on the above mechanism, a damage evolution equation is mathematically derived, and the generality of the above physical mechanisms warrants the applicability of the ICF theory over a wide range of stresses and temperatures. This paper uses Mar-M 509, a cobalt base superalloy, as an example to illustrate how the ICF theory describes creep and low cycle fatigue (LCF).

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